1
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Xiao X, Cheng L, Bao D, Tan QY, Salim T, Soci C, Chia EEM, Lam YM. Unveiling Charge-Transfer Dynamics at Singlet Fission Layer/Hybrid Perovskite Interface. ACS Appl Mater Interfaces 2023; 15:38049-38055. [PMID: 37493635 DOI: 10.1021/acsami.3c06933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Singlet fission (SF) materials have been applied in various types of solar cells to pursue higher power conversion efficiency (PCE) beyond the Shockley-Queisser (SQ) limit. SF implementation in perovskite solar cells has not been successfully realized yet due to the insufficient understanding of the SF/perovskite heterojunctions. In this work, we attempt to elucidate the charge dynamics of an SF/perovskite system by incorporating a well-known SF molecule, TIPS-pentacene, and a triple-cation perovskite Cs0.05(FA0.85MA0.15)0.95PbI2.55Br0.45, owing to their well-matched energy structures. The transient absorption spectra and kinetic fitting plots suggest an electron-transfer process from the triplet state of TIPS-pentacene to perovskite in the picosecond regime, which increases the carrier density by 20% in the perovskite layer. This work confirms the existence of an electron-transfer process between the SF material and perovskite, providing a pathway to SF-enhanced perovskite solar cells.
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Affiliation(s)
- Xingchi Xiao
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Liang Cheng
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Di Bao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Qi Ying Tan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Teddy Salim
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
- Facility for Analysis Characterisation Testing and Simulation (FACTS), Nanyang Technological University, Singapore 639798, Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Elbert E M Chia
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Yeng Ming Lam
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
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2
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Wang Y, Tian J, Klein M, Adamo G, Ha ST, Soci C. Directional Emission from Electrically Injected Exciton-Polaritons in Perovskite Metasurfaces. Nano Lett 2023; 23:4431-4438. [PMID: 37129264 DOI: 10.1021/acs.nanolett.3c00727] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present a new approach to achieving strong coupling between electrically injected excitons and photonic bound states in the continuum of a dielectric metasurface. Here a high-finesse metasurface cavity is monolithically patterned in the channel of a perovskite light-emitting transistor to induce a large Rabi splitting of ∼200 meV and more than 50-fold enhancement of the polaritonic emission compared to the intrinsic excitonic emission of the perovskite film. Moreover, the directionality of polaritonic electroluminescence can be dynamically tuned by varying the source-drain bias, which induces an asymmetric distribution of exciton population within the transistor channel. We argue that this approach provides a new platform to study strong light-matter interactions in dispersion engineered photonic cavities under electrical injection and paves the way to solution-processed electrically pumped polariton lasers.
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Affiliation(s)
- Yutao Wang
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Interdisciplinary Graduate School, Energy Research Institute @NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Jingyi Tian
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Maciej Klein
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Son Tung Ha
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
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3
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Krishnamoorthy HNS, Dubrovkin AM, Adamo G, Soci C. Topological Insulator Metamaterials. Chem Rev 2023; 123:4416-4442. [PMID: 36943013 DOI: 10.1021/acs.chemrev.2c00594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Confinement of electromagnetic fields at the subwavelength scale via metamaterial paradigms is an established method to engineer light-matter interaction in most common material systems, from insulators to semiconductors and from metals to superconductors. In recent years, this approach has been extended to the realm of topological materials, providing a new avenue to access nontrivial features of their electronic band structure. In this review, we survey various topological material classes from a photonics standpoint, including crystal growth and lithographic structuring methods. We discuss how exotic electronic features such as spin-selective Dirac plasmon polaritons in topological insulators or hyperbolic plasmon polaritons in Weyl semimetals may give rise to unconventional magneto-optic, nonlinear, and circular photogalvanic effects in metamaterials across the visible to infrared spectrum. Finally, we dwell on how these effects may be dynamically controlled by applying external perturbations in the form of electric and magnetic fields or ultrafast optical pulses. Through these examples and future perspectives, we argue that topological insulator, semimetal and superconductor metamaterials are unique systems to bridge the missing links between nanophotonic, electronic, and spintronic technologies.
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Affiliation(s)
- Harish N S Krishnamoorthy
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Alexander M Dubrovkin
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Giorgio Adamo
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
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4
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Klein M, Wang Y, Tian J, Ha ST, Paniagua-Domínguez R, Kuznetsov AI, Adamo G, Soci C. Polarization-Tunable Perovskite Light-Emitting Metatransistor. Adv Mater 2023; 35:e2207317. [PMID: 36308036 DOI: 10.1002/adma.202207317] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/09/2022] [Indexed: 06/16/2023]
Abstract
Emerging immersive visual communication technologies require light sources with complex functionality for dynamic control of polarization, directivity, wavefront, spectrum, and intensity of light. Currently, this is mostly achieved by free space bulk optic elements, limiting the adoption of these technologies. Flat optics based on artificially structured metasurfaces that operate at the sub-wavelength scale are a viable solution, however, their integration into electrically driven devices remains challenging. Here, a radically new approach to monolithic integration of a dielectric metasurface into a perovskite light-emitting transistor is demonstrated. It is shown that nanogratings directly structured on top of the transistor channel yield an 8-fold increase of electroluminescence intensity and dynamic tunability of polarization. This new light-emitting metatransistor device concept opens unlimited opportunities for light management strategies based on metasurface design and integration.
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Affiliation(s)
- Maciej Klein
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Yutao Wang
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Interdisciplinary Graduate School, Energy Research Institute @NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, 637553, Singapore, Singapore
| | - Jingyi Tian
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Son Tung Ha
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, 138634, Singapore, Singapore
| | - Ramón Paniagua-Domínguez
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, 138634, Singapore, Singapore
| | - Arseniy I Kuznetsov
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, 138634, Singapore, Singapore
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
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5
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Tian J, Adamo G, Liu H, Wu M, Klein M, Deng J, Ang NSS, Paniagua-Domínguez R, Liu H, Kuznetsov AI, Soci C. Phase-Change Perovskite Microlaser with Tunable Polarization Vortex. Adv Mater 2023; 35:e2207430. [PMID: 36321337 DOI: 10.1002/adma.202207430] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Metasurfaces supporting optical bound states in the continuum (BICs) are emerging as simple and compact optical cavities to realize polarization-vortex lasers. The winding of the polarization around the singularity defines topological charges which are generally set by the cavity design and cannot be altered without changing geometrical parameters. Here, a subwavelength-thin phase-change halide perovskite BIC metasurface functioning as a tunable polarization vortex microlaser is demonstrated. Upon the perovskite structural phase transitions, both its refractive index and gain vary substantially, inducing reversible and bistable switching between distinct polarization vortexes underpinned by opposite topological charges. Dynamic tuning and switching of the resulting vector beams may find use in microscopy imaging, particle trapping and manipulation, and optical data storage.
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Affiliation(s)
- Jingyi Tian
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Hailong Liu
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Mengfei Wu
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Maciej Klein
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Jie Deng
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Norman Soo Seng Ang
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Ramón Paniagua-Domínguez
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Hong Liu
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Arseniy I Kuznetsov
- Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
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6
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Maity A, Perotto S, Moschetta M, Hua H, Sardar S, Paternò GM, Tian J, Klein M, Adamo G, Lanzani G, Soci C. Resonant Enhancement of Polymer-Cell Optostimulation by a Plasmonic Metasurface. ACS Omega 2022; 7:42674-42680. [PMID: 36467911 PMCID: PMC9713778 DOI: 10.1021/acsomega.2c04812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/23/2022] [Indexed: 06/17/2023]
Abstract
Organic semiconductors have shown great potential as efficient bioelectronic materials. Specifically, photovoltaic polymers such as the workhorse poly(thiophene) derivatives, when stimulated with visible light, can depolarize neurons and generate action potentials, an effect that has been also employed for rescuing vision in blind rats. In this context, however, the coupling of such materials with optically resonant structures to enhance those photodriven biological effects is still in its infancy. Here, we employ the optical coupling between a nanostructured metasurface and poly(3-hexylthiophene) (P3HT) to improve the bioelectronic effects occurring upon photostimulation at the abiotic-biotic interface. In particular, we designed a spectrally tuned aluminum metasurface that can resonate with P3HT, hence augmenting the effective field experienced by the polymer. In turn, this leads to an 8-fold increase in invoked inward current in cells. This enhanced activation strategy could be useful to increase the effectiveness of P3HT-based prosthetic implants for degenerative retinal disorders.
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Affiliation(s)
- Arijit Maity
- Centre
for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Sara Perotto
- Center
for Nano Science and Technology, Istituto
Italiano di Tecnologia, via Pascoli 70/3, 20133 Milan, Italy
| | - Matteo Moschetta
- Center
for Nano Science and Technology, Istituto
Italiano di Tecnologia, via Pascoli 70/3, 20133 Milan, Italy
| | - Huang Hua
- Department
of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 28 Medical Drive, 117456 Singapore
| | - Samim Sardar
- Center
for Nano Science and Technology, Istituto
Italiano di Tecnologia, via Pascoli 70/3, 20133 Milan, Italy
| | - Giuseppe Maria Paternò
- Center
for Nano Science and Technology, Istituto
Italiano di Tecnologia, via Pascoli 70/3, 20133 Milan, Italy
- Department
of Physics, Politecnico di Milano and Center for Nano Science and
Technology, Istituto Italiano di Tecnologia, 20133 Milan, Italy
| | - Jingyi Tian
- Centre
for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Maciej Klein
- Centre
for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Giorgio Adamo
- Centre
for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Guglielmo Lanzani
- Center
for Nano Science and Technology, Istituto
Italiano di Tecnologia, via Pascoli 70/3, 20133 Milan, Italy
- Department
of Physics, Politecnico di Milano and Center for Nano Science and
Technology, Istituto Italiano di Tecnologia, 20133 Milan, Italy
| | - Cesare Soci
- Centre
for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
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7
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Long G, Adamo G, Tian J, Klein M, Krishnamoorthy HNS, Feltri E, Wang H, Soci C. Perovskite metasurfaces with large superstructural chirality. Nat Commun 2022; 13:1551. [PMID: 35322031 PMCID: PMC8943210 DOI: 10.1038/s41467-022-29253-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 03/02/2022] [Indexed: 11/18/2022] Open
Abstract
Recent attempts to synthesize hybrid perovskites with large chirality have been hampered by large size mismatch and weak interaction between their structure and the wavelength of light. Here we adopt a planar nanostructure design to overcome these limitations and realize all-dielectric perovskite metasurfaces with giant superstructural chirality. We identify a direct spectral correspondence between the near- and the far- field chirality, and tune the electric and magnetic multipole moments of the resonant chiral metamolecules to obtain large anisotropy factor of 0.49 and circular dichroism of 6350 mdeg. Simulations show that larger area metasurfaces could yield even higher optical activity, approaching the theoretical limits. Our results clearly demonstrate the advantages of nanostructrure engineering for the implementation of perovskite chiral photonic, optoelectronic, and spintronic devices. Though chiral hybrid organic-inorganic perovskites are attractive for next-generation optoelectronics, imparting strong chirality through chemical synthesis has proved challenging. Here, the authors report all-dielectric perovskite metasurfaces with giant superstructural chirality via planar nanostructuring.
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Affiliation(s)
- Guankui Long
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, 300350, Tianjin, China
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Jingyi Tian
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Maciej Klein
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Harish N S Krishnamoorthy
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Elena Feltri
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
| | - Hebin Wang
- School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, 300350, Tianjin, China
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore. .,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
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8
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Tian J, Adamo G, Liu H, Klein M, Han S, Liu H, Soci C. Optical Rashba Effect in a Light-Emitting Perovskite Metasurface. Adv Mater 2022; 34:e2109157. [PMID: 35045198 DOI: 10.1002/adma.202109157] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/13/2021] [Indexed: 06/14/2023]
Abstract
The Rashba effect, i.e., the splitting of electronic spin-polarized bands in the momentum space of a crystal with broken inversion symmetry, has enabled the realization of spin-orbitronic devices, in which spins are manipulated by spin-orbit coupling. In optics, where the helicity of light polarization represents the spin degree of freedom for spin-momentum coupling, the optical Rashba effect is manifested by the splitting of optical states with opposite chirality in the momentum space. Previous realizations of the optical Rashba effect relied on passive devices determining the surface plasmon or light propagation inside nanostructures, or the directional emission of chiral luminescence when hybridized with light-emitting media. An active device underpinned by the optical Rashba effect is demonstrated here, in which a monolithic halide perovskite metasurface emits highly directional chiral photoluminescence. An all-dielectric metasurface design with broken in-plane inversion symmetry is directly embossed into the high-refractive-index, light-emitting perovskite film, yielding a degree of circular polarization of photoluminescence of 60% at room temperature.
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Affiliation(s)
- Jingyi Tian
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Hailong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore, 138634, Singapore
| | - Maciej Klein
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Song Han
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Hong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore, 138634, Singapore
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
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9
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Ghosh A, Budanovic M, Li T, Liang C, Klein M, Soci C, Webster RD, Gurzadyan GG, Grimsdale AC. Synthesis of 5‐Azatetracene and Comparison of Its Optical and Electrochemical Properties with Tetracene. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Animesh Ghosh
- School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - Maja Budanovic
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Tianjiao Li
- Institute of Artificial Photosynthesis State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 P. R. China
| | - Caihong Liang
- School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - Maciej Klein
- Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore
- Energy Research Institute @ NTU (ERI@N) Research Techno Plaza Nanyang Technological University 50 Nanyang Drive 637553 Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Richard D. Webster
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Gagik G. Gurzadyan
- Institute of Artificial Photosynthesis State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 P. R. China
| | - Andrew C. Grimsdale
- School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
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10
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Stallhofer K, Nuber M, Cortecchia D, Bruno A, Kienberger R, Deschler F, Soci C, Iglev H. Picosecond Charge Localization Dynamics in CH 3NH 3PbI 3 Perovskite Probed by Infrared-Activated Vibrations. J Phys Chem Lett 2021; 12:4428-4433. [PMID: 33950674 DOI: 10.1021/acs.jpclett.1c00935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Hybrid metal halide perovskites exhibit well-defined semiconducting properties and efficient optoelectronic performance considering their soft crystal structure and low-energy lattice motions. The response of such a crystal lattice to light-induced charges is a fundamental question, for which experimental insight into ultrafast time scales is still sought. Here, we use infrared-activated vibrations (IRAV) of the organic components within the hybrid perovskite lattice as a sensitive probe for local structural reorganizations after photoexcitation, with femtosecond resolution. We find that the IRAV signal response shows a delayed rise of about 3 ps and subsequent decay of pronounced monomolecular character, distinguishing it from absorption associated with free carriers. We interpret our results as a two-step carrier localization process. Initially, carriers localize transiently in local energy minima formed by lattice fluctuations. A subpopulation of these can then fall into deeper trapped states over picoseconds, likely due to local reorganization of the organic molecules surrounding the carriers.
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Affiliation(s)
- Klara Stallhofer
- Physik-Department, Lehrstuhl für Laser- und Röntgenphysik, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Matthias Nuber
- Physik-Department, Lehrstuhl für Laser- und Röntgenphysik, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Daniele Cortecchia
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798
- Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Annalisa Bruno
- Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Reinhard Kienberger
- Physik-Department, Lehrstuhl für Laser- und Röntgenphysik, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Felix Deschler
- Physik-Department, Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
| | - Cesare Soci
- Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Hristo Iglev
- Physik-Department, Lehrstuhl für Laser- und Röntgenphysik, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
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11
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Sun X, Adamo G, Eginligil M, Krishnamoorthy HNS, Zheludev NI, Soci C. Topological insulator metamaterial with giant circular photogalvanic effect. Sci Adv 2021; 7:eabe5748. [PMID: 33811072 PMCID: PMC11057521 DOI: 10.1126/sciadv.abe5748] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 02/12/2021] [Indexed: 06/12/2023]
Abstract
One of the most notable manifestations of electronic properties of topological insulators is the dependence of the photocurrent direction on the helicity of circularly polarized optical excitation. The helicity-dependent photocurrents, underpinned by spin-momentum locking of surface Dirac electrons, are weak and easily overshadowed by bulk contributions. Here, we show that the chiral response can be enhanced by nanostructuring. The tight confinement of electromagnetic fields in the resonant nanostructure enhances the photoexcitation of spin-polarized surface states of topological insulator Bi1.5Sb0.5Te1.8Se1.2, leading to an 11-fold increase of the circular photogalvanic effect and a previously unobserved photocurrent dichroism (ρcirc = 0.87) at room temperature. The control of spin transport in topological materials by structural design is a previously unrecognized ability of metamaterials that bridges the gap between nanophotonics and spin electronics, providing opportunities for developing polarization-sensitive photodetectors.
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Affiliation(s)
- X Sun
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore 637371, Singapore
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
| | - G Adamo
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore 637371, Singapore
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
| | - M Eginligil
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
| | - H N S Krishnamoorthy
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore 637371, Singapore
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
| | - N I Zheludev
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore 637371, Singapore
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, UK
| | - C Soci
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore 637371, Singapore.
- Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
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12
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Abstract
Mirror symmetry is an abundant feature in both nature and technology. Its successful detection is critical for perception procedures based on visual stimuli and requires organizational processes. Neuromorphic computing, utilizing brain-mimicked networks, could be a technology-solution providing such perceptual organization functionality, and furthermore has made tremendous advances in computing efficiency by applying a spiking model of information. Spiking models inherently maximize efficiency in noisy environments by placing the energy of the signal in a minimal time. However, many neuromorphic computing models ignore time delay between nodes, choosing instead to approximate connections between neurons as instantaneous weighting. With this assumption, many complex time interactions of spiking neurons are lost. Here, we show that the coincidence detection property of a spiking-based feed-forward neural network enables mirror symmetry. Testing this algorithm exemplary on geospatial satellite image data sets reveals how symmetry density enables automated recognition of man-made structures over vegetation. We further demonstrate that the addition of noise improves feature detectability of an image through coincidence point generation. The ability to obtain mirror symmetry from spiking neural networks can be a powerful tool for applications in image-based rendering, computer graphics, robotics, photo interpretation, image retrieval, video analysis and annotation, multi-media and may help accelerating the brain-machine interconnection. More importantly it enables a technology pathway in bridging the gap between the low-level incoming sensor stimuli and high-level interpretation of these inputs as recognized objects and scenes in the world.
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Affiliation(s)
- Jonathan K George
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, USA
| | - Cesare Soci
- School of Physical and Mathematical Sciences and School Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Mario Miscuglio
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, USA
| | - Volker J Sorger
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, USA.
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13
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Zhu C, Chan EA, Wang Y, Peng W, Guo R, Zhang B, Soci C, Chong Y. Image reconstruction through a multimode fiber with a simple neural network architecture. Sci Rep 2021; 11:896. [PMID: 33441671 PMCID: PMC7806887 DOI: 10.1038/s41598-020-79646-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/08/2020] [Indexed: 11/09/2022] Open
Abstract
Multimode fibers (MMFs) have the potential to carry complex images for endoscopy and related applications, but decoding the complex speckle patterns produced by mode-mixing and modal dispersion in MMFs is a serious challenge. Several groups have recently shown that convolutional neural networks (CNNs) can be trained to perform high-fidelity MMF image reconstruction. We find that a considerably simpler neural network architecture, the single hidden layer dense neural network, performs at least as well as previously-used CNNs in terms of image reconstruction fidelity, and is superior in terms of training time and computing resources required. The trained networks can accurately reconstruct MMF images collected over a week after the cessation of the training set, with the dense network performing as well as the CNN over the entire period.
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Affiliation(s)
- Changyan Zhu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Eng Aik Chan
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore
| | - You Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Weina Peng
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, China
| | - Ruixiang Guo
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore
| | - Baile Zhang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore.
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore.
| | - Yidong Chong
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore.
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14
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Adamo G, Swaha Krishnamoorthy HN, Cortecchia D, Chaudhary B, Nalla V, Zheludev NI, Soci C. Metamaterial Enhancement of Metal-Halide Perovskite Luminescence. Nano Lett 2020; 20:7906-7911. [PMID: 33090800 DOI: 10.1021/acs.nanolett.0c02571] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Metal-halide perovskites are rapidly emerging as solution-processable optical materials for light-emitting applications. Here, we adopt a plasmonic metamaterial approach to enhance photoluminescence emission and extraction of methylammonium lead iodide (MAPbI3) thin films based on the Purcell effect. We show that hybridization of the active metal-halide film with resonant nanoscale sized slits carved into a gold film can yield more than 1 order of magnitude enhancement of luminescence intensity and nearly 3-fold reduction of luminescence lifetime corresponding to a Purcell enhancement factor of more than 300. These results show the effectiveness of resonant nanostructures in controlling metal-halide perovskite light emission properties over a tunable spectral range, a viable approach toward highly efficient perovskite light-emitting devices and single-photon emitters.
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Affiliation(s)
- Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | | | - Daniele Cortecchia
- Energy Research Institute at NTU (ERI@N), Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore 6375533
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798
| | - Bhumika Chaudhary
- Energy Research Institute at NTU (ERI@N), Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore 6375533
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798
| | - Venkatram Nalla
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Nikolay I Zheludev
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Energy Research Institute at NTU (ERI@N), Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore 6375533
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15
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Wang Z, Yuan G, Yang M, Chai J, Steve Wu QY, Wang T, Sebek M, Wang D, Wang L, Wang S, Chi D, Adamo G, Soci C, Sun H, Huang K, Teng J. Exciton-Enabled Meta-Optics in Two-Dimensional Transition Metal Dichalcogenides. Nano Lett 2020; 20:7964-7972. [PMID: 33054225 DOI: 10.1021/acs.nanolett.0c02712] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Optical wavefront engineering has been rapidly developing in fundamentals from phase accumulation in the optical path to the electromagnetic resonances of confined nanomodes in optical metasurfaces. However, the amplitude modulation of light has limited approaches that usually originate from the ohmic loss and absorptive dissipation of materials. Here, an atomically thin photon-sieve platform made of MoS2 multilayers is demonstrated for high-quality optical nanodevices, assisted fundamentally by strong excitonic resonances at the band-nesting region of MoS2. The atomic thin MoS2 significantly facilitates high transmission of the sieved photons and high-fidelity nanofabrication. A proof-of-concept two-dimensional (2D) nanosieve hologram exhibits 10-fold enhanced efficiency compared with its non-2D counterparts. Furthermore, a supercritical 2D lens with its focal spot breaking diffraction limit is developed to exhibit experimentally far-field label-free aberrationless imaging with a resolution of ∼0.44λ at λ = 450 nm in air. This transition-metal-dichalcogenide (TMDC) photonic platform opens new opportunities toward future 2D meta-optics and nanophotonics.
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Affiliation(s)
- Zeng Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Guanghui Yuan
- Centre for Disruptive Photonic Technologies, The Photonic Institute, SPMS, Nanyang Technological University, Singapore 637371, Singapore
| | - Ming Yang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Jianwei Chai
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Qing Yang Steve Wu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Tao Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Matej Sebek
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Dan Wang
- State Key Laboratory of integrated optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, China
| | - Lei Wang
- State Key Laboratory of integrated optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, China
| | - Shijie Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Dongzhi Chi
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, The Photonic Institute, SPMS, Nanyang Technological University, Singapore 637371, Singapore
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, The Photonic Institute, SPMS, Nanyang Technological University, Singapore 637371, Singapore
| | - Handong Sun
- Centre for Disruptive Photonic Technologies, The Photonic Institute, SPMS, Nanyang Technological University, Singapore 637371, Singapore
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Kun Huang
- Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinghua Teng
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
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16
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Lova P, Soci C. Black GaAs: Gold-Assisted Chemical Etching for Light Trapping and Photon Recycling. Micromachines (Basel) 2020; 11:mi11060573. [PMID: 32517034 PMCID: PMC7344674 DOI: 10.3390/mi11060573] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/28/2020] [Accepted: 06/04/2020] [Indexed: 11/16/2022]
Abstract
Thanks to its excellent semiconductor properties, like high charge carrier mobility and absorption coefficient in the near infrared spectral region, GaAs is the material of choice for thin film photovoltaic devices. Because of its high reflectivity, surface microstructuring is a viable approach to further enhance photon absorption of GaAs and improve photovoltaic performance. To this end, metal-assisted chemical etching represents a simple, low-cost, and easy to scale-up microstructuring method, particularly when compared to dry etching methods. In this work, we show that the etched GaAs (black GaAs) has exceptional light trapping properties inducing a 120 times lower surface reflectance than that of polished GaAs and that the structured surface favors photon recycling. As a proof of principle, we investigate photon reabsorption in hybrid GaAs:poly (3-hexylthiophene) heterointerfaces.
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Affiliation(s)
- Paola Lova
- Correspondence: ; Tel.: +39-010-353-6192
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17
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Yanikgonul S, Guo R, Xomalis A, Vetlugin AN, Adamo G, Soci C, Zheludev NI. Phase stabilization of a coherent fiber network by single-photon counting. Opt Lett 2020; 45:2740-2743. [PMID: 32412455 DOI: 10.1364/ol.381388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
Coherent optical fiber networks are extremely sensitive to thermal, mechanical, and acoustic noise, which requires elaborate schemes of phase stabilization with dedicated auxiliary lasers, multiplexers, and photodetectors. This is particularly demanding in quantum networks operating at the single-photon level. Here, we propose a simple method of phase stabilization based on single-photon counting and apply it to quantum fiber networks implementing single-photon interference on a lossless beamsplitter and coherent perfect absorption on a metamaterial absorber. As a proof of principle, we show dissipative single-photon switching with visibility close to 80%. This method can be employed in quantum networks of greater complexity without classical stabilization rigs, potentially increasing efficiency of the quantum channels.
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18
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Krishnamoorthy HNS, Adamo G, Yin J, Savinov V, Zheludev NI, Soci C. Infrared dielectric metamaterials from high refractive index chalcogenides. Nat Commun 2020; 11:1692. [PMID: 32245976 PMCID: PMC7125163 DOI: 10.1038/s41467-020-15444-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 02/28/2020] [Indexed: 11/09/2022] Open
Abstract
High-index dielectric materials are in great demand for nanophotonic devices and applications, from ultrathin optical elements to metal-free sub-diffraction light confinement and waveguiding. Here we show that chalcogenide topological insulators are particularly apt candidates for dielectric nanophotonics architectures in the infrared spectral range, by reporting metamaterial resonances in chalcogenide crystals sustained well inside the mid-infrared, choosing Bi2Te3 as case study within this family of materials. Strong resonant modulation of the incident electromagnetic field is achieved thanks to the exceptionally high refractive index ranging between 7 and 8 throughout the 2-10 μm region. Analysis of the complex mode structure in the metamaterial allude to the excitation of circular surface currents which could open pathways for enhanced light-matter interaction and low-loss plasmonic configurations by coupling to the spin-polarized topological surface carriers, thereby providing new opportunities to combine dielectric, plasmonic and magnetic metamaterials in a single platform.
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Affiliation(s)
- H N S Krishnamoorthy
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore, 637371, Singapore.
| | - G Adamo
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore, 637371, Singapore
| | - J Yin
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore, 637371, Singapore
| | - V Savinov
- Optoelectronics Research Centre & Centre for Photonic Metamaterials, University of Southampton, London, SO17 1BJ, UK
| | - N I Zheludev
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore, 637371, Singapore
- Optoelectronics Research Centre & Centre for Photonic Metamaterials, University of Southampton, London, SO17 1BJ, UK
| | - C Soci
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Singapore, 637371, Singapore.
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19
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Chaudhary B, Koh TM, Febriansyah B, Bruno A, Mathews N, Mhaisalkar SG, Soci C. Mixed-Dimensional Naphthylmethylammoinium-Methylammonium Lead Iodide Perovskites with Improved Thermal Stability. Sci Rep 2020; 10:429. [PMID: 31949188 PMCID: PMC6965185 DOI: 10.1038/s41598-019-57015-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 12/03/2019] [Indexed: 11/09/2022] Open
Abstract
Metal halide perovskite solar cells, despite achieving high power conversion efficiency (PCE), need to demonstrate high stability prior to be considered for industrialization. Prolonged exposure to heat, light, and moisture is known to deteriorate the perovskite material owing to the breakdown of the crystal structure into its non-photoactive components. In this study, we show that by combining the organic ligand 1-naphthylmethylammoinium iodide (NMAI) with methylammonium (MA) to form a mixed dimensional (NMA)2(MA)n-1PbnI3n+1 perovskite the optical, crystallographic and morphological properties of the newly formed mixed dimensional perovskite films under thermal ageing can be retained. Indeed, under thermal ageing at 85 °C, the best performing (NMA)2(MA)n-1PbnI3n+1 perovskites films show a stable morphology, a low PbI2 formation rate and a significantly reduced variation of both MA-specific vibrational modes and fluorescence lifetimes as compared to the pristine MAPbI3 films. These results highlight the role of the bulky NMA+ organic cation in mixed dimensional perovskites to both inhibit the MA+ diffusion and reduce the material defects, which act as non-radiative recombination centres. As a result, the thermal stability of metal halide perovskites has been substantially improved.
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Affiliation(s)
- Bhumika Chaudhary
- Interdisciplinary Graduate School, Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Teck M Koh
- Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
| | - Benny Febriansyah
- Interdisciplinary Graduate School, Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
| | - Annalisa Bruno
- Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore.
| | - Nripan Mathews
- Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Subodh G Mhaisalkar
- Energy Research Institute @ Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontiers Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore.
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore.
| | - Cesare Soci
- Division of Physics and Applied Physics School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore.
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20
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Lova P, Giusto P, Di Stasio F, Manfredi G, Paternò GM, Cortecchia D, Soci C, Comoretto D. Reshaping Hybrid Perovskites Emission with Flexible Polymer Microcavities. EPJ Web Conf 2020. [DOI: 10.1051/epjconf/202023000006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Thanks to versatile optoelectronic properties solution processable perovskites have attracted increasing interest as active materials in photovoltaic and light emitting devices. However, the deposition of perovskite thin films necessitates wide range solvents that are incompatible with many other solution-processable media, including polymers that are usually dissolved by the perovskite solvents. In this work, we demonstrate that hybrid perovskite thin films can be coupled with all polymer planar photonic crystals with different approaches to achieve emission intensity enhancement and reshaping using different approaches. The possibility to control and modify the emission spectrum of a solution processable perovskite via a simple spun-cast polymer structure is indeed of great interest in optoelectronic applications requiring high color purity or emission directionality. Furthermore, thanks to the ease of fabrication and scalability of solution-processed photonic crystals, this approach could enable industrial scale production of low-cost, large area, lightweight and flexible polymer-perovskite lighting devices, which may be tuned without resorting to compositional engineering.
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21
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Alonzo M, Soci C, Chauvet M, Fazio E. Solitonic waveguide reflection at an electric interface. Opt Express 2019; 27:20273-20281. [PMID: 31510124 DOI: 10.1364/oe.27.020273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 05/06/2019] [Indexed: 06/10/2023]
Abstract
A refractive index interface is dynamically induced in a bulk photorefractive material by biasing two adjacent regions with different electric fields, thus building up an electric wall. Effects of this interface on reflection, refraction and breathing of bright photorefractive solitons and their associated waveguides are numerically and experimentally studied as a function of the induced purely electric field gradient. Reflection and refraction efficiency depends on the amplitude and sign of the applied voltages that affect both the self-confining beam and the signals propagating inside the waveguide. Experimental tests are performed in nominally undoped lithium niobate samples.
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22
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Lova P, Giusto P, Di Stasio F, Manfredi G, Paternò GM, Cortecchia D, Soci C, Comoretto D. All-polymer methylammonium lead iodide perovskite microcavities. Nanoscale 2019; 11:8978-8983. [PMID: 31017152 DOI: 10.1039/c9nr01422e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Thanks to a high photoluminescence quantum yield, large charge carrier diffusion, and ease of processing from solution, perovskite materials are becoming increasingly interesting for flexible optoelectronic devices. However, their deposition requires wide range solvents that are incompatible with many other flexible and solution-processable materials, including polymers. Here, we show that methylammonium lead iodide (MAPbI3) films can be directly synthesized on all-polymer microcavities via simple addition of a perfluorinated layer which protects the polymer photonic structure from the perovskite processing solvents. The new processing provides microcavities with a quality factor Q = 155, that is in agreement with calculations and the largest value reported so far for fully solution processed perovskite microcavities. Furthermore, the obtained microcavity shows strong spectral and angular redistribution of the the MAPbI3 photoluminescence spectrum, which shows a 3.5 fold enhanced intensity with respect to the detuned reference. The opportunity to control and modify the emission of a MAPbI3 film via a simple spun-cast polymer structure is of great interest in advanced optoelectronic applications requiring high colour purity or emission directionality.
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Affiliation(s)
- Paola Lova
- Dipartimento di Chimica e Chimica Industriale, Università di Genova, 16146 Genova, Italy.
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23
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Saeed S, Yin J, Khalid MA, Channar PA, Shabir G, Saeed A, Arif Nadeem M, Soci C, Iqbal A. Photoresponsive azobenzene ligand as an efficient electron acceptor for luminous CdTe quantum dots. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.02.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Maddalena F, Chin XY, Cortecchia D, Bruno A, Soci C. Brightness Enhancement in Pulsed-Operated Perovskite Light-Emitting Transistors. ACS Appl Mater Interfaces 2018; 10:37316-37325. [PMID: 30277074 DOI: 10.1021/acsami.8b11057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Perovskite light-emitting field-effect transistors (PeLEFETs) provide a versatile device architecture to control transport and electroluminescence properties of hybrid perovskites, enabling injection of high charge carrier density and spatial control of the radiative recombination zone. Ionic screening and organic cation polarization effects typical of metal-halide perovskites, however, critically affect PeLEFET efficiency and reliability. In this work, we demonstrate a new device operation mode based on high-frequency modulation of the applied voltages, which allows significant reduction of ionic drift/screening in methylammonium lead iodide light-emitting transistors. In optimized top contact PeLEFETs, AC operation results in brighter and more uniform electroluminescence compared to DC-driven devices, whereas high-frequency modulation enables electroluminescence emission up to room temperature.
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Affiliation(s)
| | - Xin Yu Chin
- Energy Research Institute @ NTU , Nanyang Technological University , 637553 , Singapore
| | - Daniele Cortecchia
- Energy Research Institute @ NTU , Nanyang Technological University , 637553 , Singapore
- Interdisciplinary Graduate School , Nanyang Technological University , 639798 , Singapore
| | - Annalisa Bruno
- Energy Research Institute @ NTU , Nanyang Technological University , 637553 , Singapore
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25
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Abstract
Large area surface microstructuring is commonly employed to suppress light reflection and enhance light absorption in silicon photovoltaic devices, photodetectors, and image sensors. To date, however, there are no simple means to control the surface roughness of III-V semiconductors by chemical processes similar to the metal-assisted chemical etching of black Si. Here, we demonstrate the anisotropic metal-assisted chemical etching of GaAs wafers exploiting the lower etching rate of the monoatomic Ga<111> and <311> planes. By studying the dependence of this process on different crystal orientations, we propose a qualitative reaction mechanism responsible for the self-limiting anisotropic etching and show that the reflectance of the roughened surface of black GaAs reduces up to ∼50 times compared to polished wafers, nearly doubling its absorption. This method provides a new, simple, and scalable way to enhance light absorption and power conversion efficiency of GaAs solar cells and photodetectors.
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Affiliation(s)
- Paola Lova
- Energy Research Institute at NTU (ERI@N) and Interdisciplinary Graduate School , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798
- School of Physical and Mathematical Sciences, Division of Physics and Applied Physics , Nanyang Technological University , 21 Nanyang Link , Singapore 637371
| | - Valentina Robbiano
- Department of Physics and Astronomy and London Centre for Nanotechnology , University College London , London WC1E 6BT , United Kingdom
| | - Franco Cacialli
- Department of Physics and Astronomy and London Centre for Nanotechnology , University College London , London WC1E 6BT , United Kingdom
| | - Davide Comoretto
- Dipartimento di Chimica e Chimica Industriale , Università degli Studi di Genova , via Dodecaneso 31 , 16121 Genova , Italy
| | - Cesare Soci
- Energy Research Institute at NTU (ERI@N) and Interdisciplinary Graduate School , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798
- School of Physical and Mathematical Sciences, Division of Physics and Applied Physics , Nanyang Technological University , 21 Nanyang Link , Singapore 637371
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26
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Yantara N, Bruno A, Iqbal A, Jamaludin NF, Soci C, Mhaisalkar S, Mathews N. Designing Efficient Energy Funneling Kinetics in Ruddlesden-Popper Perovskites for High-Performance Light-Emitting Diodes. Adv Mater 2018; 30:e1800818. [PMID: 29971842 DOI: 10.1002/adma.201800818] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/17/2018] [Indexed: 05/11/2023]
Abstract
Mixed Ruddlesden-Popper (RP) perovskites are of great interest in light-emitting diodes (LEDs), due to the efficient energy transfer (funneling) from high-bandgap (donor) domains to low-bandgap (acceptor) domains, which leads to enhanced photoluminescence (PL) intensity, long PL lifetime, and high-efficiency LEDs. However, the influence of reduced effective emitter centers in the active emissive film, as well as the implications of electrical injection into the larger bandgap donor material, have not been addressed in the context of an active device. The electrical and optical signatures of the energy cascading mechanisms are critically assessed and modulated in a model RP perovskite series ((C8 H17 NH3 )2 (CH(NH2 )2 )m-1 Pbm Br3m+1 ). Optimized devices demonstrate a current efficiency of 22.9 cd A-1 and 5% external quantum efficiency, more than five times higher than systems where funneling is absent. The signature of nonideal funneling in RP perovskites is revealed by the appearance of donor electroluminescence from the device, followed by a reduction in the LED performance.
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Affiliation(s)
- Natalia Yantara
- Energy Research Institute @ NTU, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore
| | - Annalisa Bruno
- Energy Research Institute @ NTU, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore
| | - Azhar Iqbal
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Nur Fadilah Jamaludin
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Subodh Mhaisalkar
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Nripan Mathews
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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27
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Bargigia I, Zucchetti E, Kandada ARS, Moreira M, Bossio C, Wong WPD, Miranda PB, Decuzzi P, Soci C, D'Andrea C, Lanzani G. The Photophysics of Polythiophene Nanoparticles for Biological Applications. Chembiochem 2018; 20:532-536. [DOI: 10.1002/cbic.201800167] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Indexed: 11/12/2022]
Affiliation(s)
- Ilaria Bargigia
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
| | - Elena Zucchetti
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
- Department of PhysicsPolitecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano Italy
| | - Ajay Ram Srimath Kandada
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
| | - Miguel Moreira
- Laboratory of Nanotechnology for Precision MedicineIstituto Italiano di Tecnologia via Morego 30 16163 Genova Italy
| | - Caterina Bossio
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
| | - Walter P. D. Wong
- School of Material Science and EngineeringNanyang Technological University Singapore 637371 Singapore
| | - Paulo Barbeitas Miranda
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
- Department of PhysicsPolitecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano Italy
- São Carlos Physics InstituteUniversity of São Paulo CP 369 Sao Carlos SP 13560-970 Brazil
| | - Paolo Decuzzi
- Laboratory of Nanotechnology for Precision MedicineIstituto Italiano di Tecnologia via Morego 30 16163 Genova Italy
| | - Cesare Soci
- School of Material Science and EngineeringNanyang Technological University Singapore 637371 Singapore
| | - Cosimo D'Andrea
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
- Department of PhysicsPolitecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology @PolimiIstituto Italiano di Tecnologia via Pascoli 70/3 20133 Milano Italy
- Department of PhysicsPolitecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano Italy
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28
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Alonzo M, Moscatelli D, Bastiani L, Belardini A, Soci C, Fazio E. All-Optical Reinforcement Learning In Solitonic X-Junctions. Sci Rep 2018; 8:5716. [PMID: 29632391 PMCID: PMC5890259 DOI: 10.1038/s41598-018-24084-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 03/27/2018] [Indexed: 11/26/2022] Open
Abstract
Ethology has shown that animal groups or colonies can perform complex calculation distributing simple decision-making processes to the group members. For example ant colonies can optimize the trajectories towards the food by performing both a reinforcement (or a cancellation) of the pheromone traces and a switch from one path to another with stronger pheromone. Such ant’s processes can be implemented in a photonic hardware to reproduce stigmergic signal processing. We present innovative, completely integrated X-junctions realized using solitonic waveguides which can provide both ant’s decision-making processes. The proposed X-junctions can switch from symmetric (50/50) to asymmetric behaviors (80/20) using optical feedbacks, vanishing unused output channels or reinforcing the used ones.
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Affiliation(s)
- M Alonzo
- Department of Fundamental and Applied Sciences for Engineering, Sapienza Università di Roma, via Scarpa 16, 00161, Roma, Italy
| | - D Moscatelli
- Department of Fundamental and Applied Sciences for Engineering, Sapienza Università di Roma, via Scarpa 16, 00161, Roma, Italy
| | - L Bastiani
- Department of Fundamental and Applied Sciences for Engineering, Sapienza Università di Roma, via Scarpa 16, 00161, Roma, Italy
| | - A Belardini
- Department of Fundamental and Applied Sciences for Engineering, Sapienza Università di Roma, via Scarpa 16, 00161, Roma, Italy
| | - C Soci
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - E Fazio
- Department of Fundamental and Applied Sciences for Engineering, Sapienza Università di Roma, via Scarpa 16, 00161, Roma, Italy.
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29
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Jamaludin NF, Yantara N, Ng YF, Li M, Goh TW, Thirumal K, Sum TC, Mathews N, Soci C, Mhaisalkar S. Grain Size Modulation and Interfacial Engineering of CH3
NH3
PbBr3
Emitter Films through Incorporation of Tetraethylammonium Bromide. Chemphyschem 2018; 19:1075-1080. [DOI: 10.1002/cphc.201701380] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Nur Fadilah Jamaludin
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
- Interdisciplinary Graduate School; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
- School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
| | - Natalia Yantara
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
| | - Yan Fong Ng
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
- Interdisciplinary Graduate School; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
- School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
| | - Mingjie Li
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Teck Wee Goh
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Krishnamoorthy Thirumal
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
| | - Tze Chien Sum
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Nripan Mathews
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
- School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Subodh Mhaisalkar
- Energy Research Institute @ NTU (ERI@N); Nanyang Technological University; Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore
- School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
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30
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Vázquez MR, Bharadwaj V, Sotillo B, Lo SZA, Ramponi R, Zheludev NI, Lanzani G, Eaton SM, Soci C. Optical NP problem solver on laser-written waveguide platform. Opt Express 2018; 26:702-710. [PMID: 29401952 DOI: 10.1364/oe.26.000702] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/26/2017] [Indexed: 06/07/2023]
Abstract
Cognitive photonic networks are researched to efficiently solve computationally hard problems. Flexible fabrication techniques for the implementation of such networks into compact and scalable chips are desirable for the study of new optical computing schemes and algorithm optimization. Here we demonstrate a femtosecond laser-written optical oracle based on cascaded directional couplers in glass, for the solution of the Hamiltonian path problem. By interrogating the integrated photonic chip with ultrashort laser pulses, we were able to distinguish the different paths traveled by light pulses, and thus infer the existence or the absence of the Hamiltonian path in the network by using an optical correlator. This work proves that graph theory problems may be easily implemented in integrated photonic networks, down scaling the net size and speeding up execution times.
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31
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Neogi I, Bruno A, Bahulayan D, Goh TW, Ghosh B, Ganguly R, Cortecchia D, Sum TC, Soci C, Mathews N, Mhaisalkar SG. Broadband-Emitting 2 D Hybrid Organic-Inorganic Perovskite Based on Cyclohexane-bis(methylamonium) Cation. ChemSusChem 2017; 10:3765-3772. [PMID: 28752545 DOI: 10.1002/cssc.201701227] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Indexed: 05/06/2023]
Abstract
A new broadband-emitting 2 D hybrid organic-inorganic perovskite (CyBMA)PbBr4 based on highly flexible cis-1,3-bis(methylaminohydrobromide)cyclohexane (CyBMABr) core has been designed, synthesized, and investigated, highlighting the effects of stereoisomerism of the templating cation on the formation and properties of the resulting perovskite. The new 2 D material has high exciton binding energy of 340 meV and a broad emission spanning from 380 to 750 nm, incorporating a prominent excitonic band and a less intense broad peak at room temperature. Significant changes in the photoluminescence (PL) spectrum were observed at lower temperatures, showing remarkable enhancement in the intensity of the broadband at the cost of excitonic emission. Temperature-dependent PL mapping indicates the effective role of only a narrow band of excitonic absorption in the generation of the active channel for emission. Based on the evidences obtained from the photophysical investigations, we attributed the evolution of the broad B-band of (CyBMA)PbBr4 to excitonic self-trapped states.
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Affiliation(s)
- Ishita Neogi
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
| | - Annalisa Bruno
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Damodaran Bahulayan
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
| | - Teck Wee Goh
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Biplab Ghosh
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Rakesh Ganguly
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Daniele Cortecchia
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
- Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Tze Chien Sum
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Cesare Soci
- School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore
| | - Nripan Mathews
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
| | - Subodh Gautam Mhaisalkar
- Energy Research Institute, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
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32
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Glaeske M, Kumar M, Bisswanger T, Vaitiekenas S, Soci C, Narula R, Bruno A, Setaro A. Relaxation lifetimes of plasmonically enhanced hybrid gold-carbon nanotubes systems. Nanotechnology 2017; 28:255202. [PMID: 28520555 DOI: 10.1088/1361-6528/aa7409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recently, we introduced a novel hybridization route for carbon nanotubes using gold nanoparticles, whose close proximity neatly enhances their radiative emission. Here we investigate the mechanisms behind the enhancement by monitoring the de-excitation dynamics of our π-hybrids through two-color pump-probe time-resolved spectroscopy. The de-excitation process reveals a fast component and a slow component. We find that the presence of gold prominently affects the fast processes, indicating a stronger influence of the gold nanoparticle on the intra-band non-radiative relaxation than on the inter-band recombination of the single-walled carbon nanotube. By evaluating the de-excitation times, we estimate the balance between near-field pumping and the faster metal-induced de-excitation contributions, proving the enhanced pumping to be the leading mechanism.
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Affiliation(s)
- M Glaeske
- Department of Physics, Free University Berlin, Arnimallee 14, D-14195 Berlin, Germany
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33
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Liu R, Chen R, Elthakeb AT, Lee SH, Hinckley S, Khraiche ML, Scott J, Pre D, Hwang Y, Tanaka A, Ro YG, Matsushita AK, Dai X, Soci C, Biesmans S, James A, Nogan J, Jungjohann KL, Pete DV, Webb DB, Zou Y, Bang AG, Dayeh SA. High Density Individually Addressable Nanowire Arrays Record Intracellular Activity from Primary Rodent and Human Stem Cell Derived Neurons. Nano Lett 2017; 17:2757-2764. [PMID: 28384403 PMCID: PMC6045931 DOI: 10.1021/acs.nanolett.6b04752] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We report a new hybrid integration scheme that offers for the first time a nanowire-on-lead approach, which enables independent electrical addressability, is scalable, and has superior spatial resolution in vertical nanowire arrays. The fabrication of these nanowire arrays is demonstrated to be scalable down to submicrometer site-to-site spacing and can be combined with standard integrated circuit fabrication technologies. We utilize these arrays to perform electrophysiological recordings from mouse and rat primary neurons and human induced pluripotent stem cell (hiPSC)-derived neurons, which revealed high signal-to-noise ratios and sensitivity to subthreshold postsynaptic potentials (PSPs). We measured electrical activity from rodent neurons from 8 days in vitro (DIV) to 14 DIV and from hiPSC-derived neurons at 6 weeks in vitro post culture with signal amplitudes up to 99 mV. Overall, our platform paves the way for longitudinal electrophysiological experiments on synaptic activity in human iPSC based disease models of neuronal networks, critical for understanding the mechanisms of neurological diseases and for developing drugs to treat them.
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Affiliation(s)
- Ren Liu
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Renjie Chen
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Ahmed T. Elthakeb
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Sang Heon Lee
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Sandy Hinckley
- Conrad Prebys Center for Chemical Genomics, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Massoud L. Khraiche
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - John Scott
- Neurobiology Section, Biological Sciences Division, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Deborah Pre
- Conrad Prebys Center for Chemical Genomics, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Yoontae Hwang
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Atsunori Tanaka
- Graduate Program of Materials Science and Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Yun Goo Ro
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Albert K. Matsushita
- Graduate Program of Materials Science and Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Xing Dai
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Steven Biesmans
- Conrad Prebys Center for Chemical Genomics, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Anthony James
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - John Nogan
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Katherine L. Jungjohann
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Douglas V. Pete
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Denise B. Webb
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Yimin Zou
- Neurobiology Section, Biological Sciences Division, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Anne G. Bang
- Conrad Prebys Center for Chemical Genomics, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Shadi A. Dayeh
- Integrated Electronics and Biointerfaces Laboratory, Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- Graduate Program of Materials Science and Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- Corresponding Author:
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Gholipour B, Adamo G, Cortecchia D, Krishnamoorthy HNS, Birowosuto MD, Zheludev NI, Soci C. Organometallic Perovskite Metasurfaces. Adv Mater 2017; 29:1604268. [PMID: 28054390 DOI: 10.1002/adma.201604268] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Organometallic perovskites, solution-processable materials with outstanding optoelectronic properties and high index of refraction, provide a platform for all-dielectric metamaterials operating at visible frequencies. Perovskite metasurfaces with structural coloring tunable across visible frequencies are realized through subwavelength structuring. Moreover, a threefold increase of the luminescence yield and comparable reduction of luminescence decay time are observed.
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Affiliation(s)
- Behrad Gholipour
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Giorgio Adamo
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Daniele Cortecchia
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore, 639798, Singapore
- Energy Research Institute @ NTU (ERI@N), Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Singapore
| | - Harish N S Krishnamoorthy
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Muhammad D Birowosuto
- CINTRA UMI CNRS/NTU/THALES 3288, Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, Singapore, 637553, Singapore
| | - Nikolay I Zheludev
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, SO17 1BJ, Southampton, UK
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Energy Research Institute @ NTU (ERI@N), Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Singapore
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35
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Ng YF, Kulkarni SA, Parida S, Jamaludin NF, Yantara N, Bruno A, Soci C, Mhaisalkar S, Mathews N. Highly efficient Cs-based perovskite light-emitting diodes enabled by energy funnelling. Chem Commun (Camb) 2017; 53:12004-12007. [DOI: 10.1039/c7cc06615e] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Incorporation of phenylethylammonium bromide into a fully inorganic CsPbBr3 perovskite framework led to the formation of quasi-2D perovskites with exceptional energy funnelling via an energy cascade.
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Affiliation(s)
- Yan Fong Ng
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
- Interdisciplinary Graduate School
| | - Sneha A. Kulkarni
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
| | | | - Nur Fadilah Jamaludin
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
- Interdisciplinary Graduate School
| | - Natalia Yantara
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
| | - Annalisa Bruno
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
| | - Subodh Mhaisalkar
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
- School of Materials Science and Engineering
| | - Nripan Mathews
- Energy Research Institute@NTU (ERI@N)
- Research Techno Plaza
- X-Frontier Block
- Singapore
- School of Materials Science and Engineering
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Cortecchia D, Neutzner S, Srimath Kandada AR, Mosconi E, Meggiolaro D, De Angelis F, Soci C, Petrozza A. Broadband Emission in Two-Dimensional Hybrid Perovskites: The Role of Structural Deformation. J Am Chem Soc 2016; 139:39-42. [DOI: 10.1021/jacs.6b10390] [Citation(s) in RCA: 264] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Daniele Cortecchia
- Interdisciplinary
Graduate School, Energy Research Institute @ NTU(ERI@N), Nanyang Technological University, 639798 Singapore
- Centre
for Nano Science and Technology (CNST@PoliMi), Istituto Italiano di Tecnologia, via Pascoli 70/3, Milan 20133, Italy
| | - Stefanie Neutzner
- Centre
for Nano Science and Technology (CNST@PoliMi), Istituto Italiano di Tecnologia, via Pascoli 70/3, Milan 20133, Italy
| | - Ajay Ram Srimath Kandada
- Centre
for Nano Science and Technology (CNST@PoliMi), Istituto Italiano di Tecnologia, via Pascoli 70/3, Milan 20133, Italy
| | - Edoardo Mosconi
- Istituto
CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Università di Perugia, Perugia I-06123, Italy
- CompuNet, Istituto Italiano di Tecnologia, Via Morego
30, 16163 Genova, Italy
| | - Daniele Meggiolaro
- Istituto
CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Università di Perugia, Perugia I-06123, Italy
- CompuNet, Istituto Italiano di Tecnologia, Via Morego
30, 16163 Genova, Italy
| | - Filippo De Angelis
- Istituto
CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Università di Perugia, Perugia I-06123, Italy
- CompuNet, Istituto Italiano di Tecnologia, Via Morego
30, 16163 Genova, Italy
| | - Cesare Soci
- Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 637371 Singapore
| | - Annamaria Petrozza
- Centre
for Nano Science and Technology (CNST@PoliMi), Istituto Italiano di Tecnologia, via Pascoli 70/3, Milan 20133, Italy
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Cortecchia D, Soci C, Cametti M, Petrozza A, Martí-Rujas J. Crystal Engineering of a Two-Dimensional Lead-Free Perovskite with Functional Organic Cations by Second-Sphere Coordination. Chempluschem 2016; 82:671. [DOI: 10.1002/cplu.201600603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Daniele Cortecchia
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
- Interdisciplinary Graduate School; Energy Research Institute (ERI@N); Nanyang Technological University; Research Technoplaza Nanyang Drive 639798 Singapore Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 637371 Singapore Singapore
| | - Massimo Cametti
- Dipartimento di Chimica Materiali; e Ingegneria Chimica „Giulio Natta“; Politecnico di Milano; Via Mancinelli 7 20131 Milan Italy
| | - Annamaria Petrozza
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
| | - Javier Martí-Rujas
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
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Cortecchia D, Soci C, Cametti M, Petrozza A, Martí-Rujas J. Cover Picture: Crystal Engineering of a Two-Dimensional Lead-Free Perovskite with Functional Organic Cations by Second-Sphere Coordination (ChemPlusChem 5/2017). Chempluschem 2016. [DOI: 10.1002/cplu.201600604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Daniele Cortecchia
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
- Interdisciplinary Graduate School; Energy Research Institute (ERI@N); Nanyang Technological University; Research Technoplaza Nanyang Drive 639798 Singapore Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 637371 Singapore Singapore
| | - Massimo Cametti
- Dipartimento di Chimica Materiali; e Ingegneria Chimica „Giulio Natta“; Politecnico di Milano; Via Mancinelli 7 20131 Milan Italy
| | - Annamaria Petrozza
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
| | - Javier Martí-Rujas
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
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Lova P, Bastianini C, Giusto P, Patrini M, Rizzo P, Guerra G, Iodice M, Soci C, Comoretto D. Label-Free Vapor Selectivity in Poly(p-Phenylene Oxide) Photonic Crystal Sensors. ACS Appl Mater Interfaces 2016; 8:31941-31950. [PMID: 27808494 DOI: 10.1021/acsami.6b10809] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The lack of sensors for low cost, extensive, and continuous detection of vapor pollutants is a serious concern for health and safety in industrialized urban areas. Colorimetric sensors, such as distributed Bragg reflectors made of polymers, could achieve this task thanks to their low cost and easy signal transduction but are typically affected by low vapor permeability and lack of selectivity without chemical labeling. Here we demonstrate all-polymer Bragg multilayers for label-free selective detection of organic volatile compounds. The system exploits the ability of amorphous poly(p-phenylene oxide), PPO, to uptake large amount of guest molecules and to form cocrystalline phases with distinct optical properties. Bragg stacks embedding PPO active layers show selective colorimetric response to vapors of carbon tetrachloride and aromatic homologues, which can be revealed by the naked eye.
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Affiliation(s)
- Paola Lova
- Energy Research Institute at NTU (ERI@AN), Interdisciplinary Graduate School, Nanyang Technological University , Singapore 639798
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova , 16126 Genova, Italy
| | - Chiara Bastianini
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova , 16126 Genova, Italy
| | - Paolo Giusto
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova , 16126 Genova, Italy
| | - Maddalena Patrini
- Dipartimento di Fisica, Università degli Studi di Pavia , 27100 Pavia, Italy
| | - Paola Rizzo
- Dipartimento di Chimica e Biologia, Università di Salerno , 84084 Salerno, Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia, Università di Salerno , 84084 Salerno, Italy
| | - Mario Iodice
- Istituto per la Microelettronica e Microsistemi, Consiglio Nazionale delle Ricerche , 95121 Napoli, Italy
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University , Singapore 637371
| | - Davide Comoretto
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova , 16126 Genova, Italy
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Cortecchia D, Soci C, Cametti M, Petrozza A, Martí-Rujas J. Crystal Engineering of a Two-Dimensional Lead-Free Perovskite with Functional Organic Cations by Second-Sphere Coordination. Chempluschem 2016; 82:681-685. [DOI: 10.1002/cplu.201600477] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Daniele Cortecchia
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
- Interdisciplinary Graduate School; Energy Research Institute (ERI@N); Nanyang Technological University; Research Technoplaza Nanyang Drive 639798 Singapore Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 637371 Singapore Singapore
| | - Massimo Cametti
- Dipartimento di Chimica Materiali; e Ingegneria Chimica „Giulio Natta“; Politecnico di Milano; Via Mancinelli 7 20131 Milan Italy
| | - Annamaria Petrozza
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
| | - Javier Martí-Rujas
- Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi); Politecnico di Milano; Via Pascoli 70/3 20133 Milan Italy
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Gholipour B, Bastock P, Cui L, Craig C, Khan K, Hewak DW, Soci C. Lithography Assisted Fiber-Drawing Nanomanufacturing. Sci Rep 2016; 6:35409. [PMID: 27739543 PMCID: PMC5064402 DOI: 10.1038/srep35409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 09/27/2016] [Indexed: 01/10/2023] Open
Abstract
We present a high-throughput and scalable technique for the production of metal nanowires embedded in glass fibres by taking advantage of thin film properties and patterning techniques commonly used in planar microfabrication. This hybrid process enables the fabrication of single nanowires and nanowire arrays encased in a preform material within a single fibre draw, providing an alternative to costly and time-consuming iterative fibre drawing. This method allows the combination of materials with different thermal properties to create functional optoelectronic nanostructures. As a proof of principle of the potential of this technique, centimetre long gold nanowires (bulk Tm = 1064 °C) embedded in silicate glass fibres (Tg = 567 °C) were drawn in a single step with high aspect ratios (>104); such nanowires can be released from the glass matrix and show relatively high electrical conductivity. Overall, this fabrication method could enable mass manufacturing of metallic nanowires for plasmonics and nonlinear optics applications, as well as the integration of functional multimaterial structures for completely fiberised optoelectronic devices.
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Affiliation(s)
- Behrad Gholipour
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, 637371, Singapore
| | - Paul Bastock
- Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
| | - Long Cui
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, 637371, Singapore
| | - Christopher Craig
- Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
| | - Khouler Khan
- Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
| | - Daniel W Hewak
- Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, Nanyang Technological University, 637371, Singapore
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Yuan GH, Vezzoli S, Altuzarra C, Rogers ETF, Couteau C, Soci C, Zheludev NI. Quantum super-oscillation of a single photon. Light Sci Appl 2016; 5:e16127. [PMID: 30167180 PMCID: PMC6059939 DOI: 10.1038/lsa.2016.127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/03/2016] [Accepted: 03/04/2016] [Indexed: 05/14/2023]
Abstract
Super-oscillation is a counterintuitive phenomenon describing localized fast variations of functions and fields that happen at frequencies higher than the highest Fourier component of their spectra. The physical implications of this effect have been studied in information theory and optics of classical fields, and have been used in super-resolution imaging. As a general phenomenon of wave dynamics, super-oscillations have also been predicted to exist in quantum wavefunctions. Here we report the experimental demonstration of super-oscillatory behavior of a single-quantum object, a photon. The super-oscillatory behavior is demonstrated by tight localization of the photon wavefunction after focusing with an appropriately designed slit mask to create an interference pattern with a sub-diffraction hotspot (~0.45 λ). Such quantum super-oscillation can be used for low-intensity far-field super-resolution imaging techniques even down to single-photon counting regime, which would be of interest to quantum physics and non-invasive and label-free biological studies.
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Affiliation(s)
- Guang Hui Yuan
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
| | - Stefano Vezzoli
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
| | - Charles Altuzarra
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
- CINTRA, CNRS-NTU-Thales, CNRS UMI 3288, Singapore 637553, Singapore
| | - Edward TF Rogers
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Christophe Couteau
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
- CINTRA, CNRS-NTU-Thales, CNRS UMI 3288, Singapore 637553, Singapore
- Laboratory for Nanotechnology, Instrumentation and Optics, ICD CNRS UMR 6281, University of Technology of Troyes, Troyes 10000, France
| | - Cesare Soci
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
| | - Nikolay I Zheludev
- The Photonics Institute, Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, UK
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Ma L, Hu P, Jiang H, Kloc C, Sun H, Soci C, Voityuk AA, Michel-Beyerle ME, Gurzadyan GG. Single photon triggered dianion formation in TCNQ and F4TCNQ crystals. Sci Rep 2016; 6:28510. [PMID: 27346797 PMCID: PMC4921923 DOI: 10.1038/srep28510] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 06/06/2016] [Indexed: 12/15/2022] Open
Abstract
Excited state dynamics in two strong organic electron acceptor systems, TCNQ and F4TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F4TCNQ τ = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F4TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV).
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Affiliation(s)
- Lin Ma
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Peng Hu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Hui Jiang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Christian Kloc
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Alexander A Voityuk
- Instituciό Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Spain.,Institut de Química Computacional i Catàlisi (IQCC), Universitat de Girona, Campus de Montilivi 17071 Girona, Spain
| | - Maria E Michel-Beyerle
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Gagik G Gurzadyan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.,Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemicals F-209, Dalian University of Technology, Dalian, 116024, China
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Hu W, Wu K, Shum PP, Zheludev NI, Soci C. All-Optical Implementation of the Ant Colony Optimization Algorithm. Sci Rep 2016; 6:26283. [PMID: 27222098 PMCID: PMC4879568 DOI: 10.1038/srep26283] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 04/22/2016] [Indexed: 11/09/2022] Open
Abstract
We report all-optical implementation of the optimization algorithm for the famous "ant colony" problem. Ant colonies progressively optimize pathway to food discovered by one of the ants through identifying the discovered route with volatile chemicals (pheromones) secreted on the way back from the food deposit. Mathematically this is an important example of graph optimization problem with dynamically changing parameters. Using an optical network with nonlinear waveguides to represent the graph and a feedback loop, we experimentally show that photons traveling through the network behave like ants that dynamically modify the environment to find the shortest pathway to any chosen point in the graph. This proof-of-principle demonstration illustrates how transient nonlinearity in the optical system can be exploited to tackle complex optimization problems directly, on the hardware level, which may be used for self-routing of optical signals in transparent communication networks and energy flow in photonic systems.
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Affiliation(s)
- Wenchao Hu
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.,School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SINGAPORE
| | - Kan Wu
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, 200240, China
| | - Perry Ping Shum
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.,School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SINGAPORE
| | - Nikolay I Zheludev
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.,Optoelectronics Research Centre, University of Southampton, SO17 1BJ, UK
| | - Cesare Soci
- Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
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Nguyen DM, Soci C, Ooi CHR. Coherently Tunable Triangular Trefoil Phaseonium Metamaterial. Sci Rep 2016; 6:21083. [PMID: 26879520 PMCID: PMC4754698 DOI: 10.1038/srep21083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 01/11/2016] [Indexed: 12/04/2022] Open
Abstract
Phaseonium is a three-level Λ quantum system, in which a coherent microwave and an optical control (pump) beams can be used to actively modulate the dielectric response. Here we propose a new metamaterial structure comprising of a periodic array of triangular phaseonium metamolecules arranged as a trefoil. We present a computational study of the spatial distribution of magnetic and electric fields of the probe light and the corresponding transmission and reflection, for various parameters of the optical and microwave beams. For specific values of the probing frequencies and control fields, the phaseonium can display either metallic or dielectric optical response. We find that, in the metallic regime, the phaseonium metamaterial structure supports extremely large transmission, with optical amplification at large enough intensity of the microwave thanks to strong surface plasmon coupling; while, in the dielectric regime without microwave excitation, the transmission bandwidth can be tuned by varying the control beam intensity. Implementation of such phaseonium metamaterial structure in solid-state systems, such as patterned crystals doped with rare-earth elements or dielectric matrices embedded with quantum dots, could enable a new class of actively tunable quantum metamaterials.
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Affiliation(s)
- D M Nguyen
- Centre for disruptive photonic technologies, Nanyang Technological University, Singapore, 637371.,CINTRA CNRS/NTU/Thales, UMI 3288, Research Techno Plaza, Singapore 637553
| | - Cesare Soci
- Centre for disruptive photonic technologies, Nanyang Technological University, Singapore, 637371
| | - C H Raymond Ooi
- Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Cortecchia D, Dewi HA, Yin J, Bruno A, Chen S, Baikie T, Boix PP, Grätzel M, Mhaisalkar S, Soci C, Mathews N. Lead-Free MA2CuCl(x)Br(4-x) Hybrid Perovskites. Inorg Chem 2016; 55:1044-52. [PMID: 26756860 DOI: 10.1021/acs.inorgchem.5b01896] [Citation(s) in RCA: 174] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Despite their extremely good performance in solar cells with efficiencies approaching 20% and the emerging application for light-emitting devices, organic-inorganic lead halide perovskites suffer from high content of toxic, polluting, and bioaccumulative Pb, which may eventually hamper their commercialization. Here, we present the synthesis of two-dimensional (2D) Cu-based hybrid perovskites and study their optoelectronic properties to investigate their potential application in solar cells and light-emitting devices, providing a new environmental-friendly alternative to Pb. The series (CH3NH3)2CuCl(x)Br(4-x) was studied in detail, with the role of Cl found to be essential for stabilization. By exploiting the additional Cu d-d transitions and appropriately tuning the Br/Cl ratio, which affects ligand-to-metal charge transfer transitions, the optical absorption in this series of compounds can be extended to the near-infrared for optimal spectral overlap with the solar irradiance. In situ formation of Cu(+) ions was found to be responsible for the green photoluminescence of this material set. Processing conditions for integrating Cu-based perovskites into photovoltaic device architectures, as well as the factors currently limiting photovoltaic performance, are discussed: among them, we identified the combination of low absorption coefficient and heavy mass of the holes as main limitations for the solar cell efficiency. To the best of our knowledge, this is the first demonstration of the potential of 2D copper perovskite as light harvesters and lays the foundation for further development of perovskite based on transition metals as alternative lead-free materials. Appropriate molecular design will be necessary to improve the material's properties and solar cell performance filling the gap with the state-of-the-art Pb-based perovskite devices.
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Affiliation(s)
- Daniele Cortecchia
- Interdisciplinary Graduate School, Energy Research Institute at NTU , 639798 Singapore.,Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore
| | - Herlina Arianita Dewi
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore
| | - Jun Yin
- Division of Physics and Applied Physics, Nanyang Technological University , 637371 Singapore
| | - Annalisa Bruno
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore.,Division of Physics and Applied Physics, Nanyang Technological University , 637371 Singapore
| | - Shi Chen
- Division of Physics and Applied Physics, Nanyang Technological University , 637371 Singapore
| | - Tom Baikie
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore
| | - Pablo P Boix
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore
| | - Michael Grätzel
- Laboratory of Photonics and Interfaces, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology , Station 6, Lausanne CH-1015, Switzerland
| | - Subodh Mhaisalkar
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore.,School of Materials Science and Engineering, Nanyang Technological University , Nanyang Avenue, 639798 Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, Nanyang Technological University , 637371 Singapore
| | - Nripan Mathews
- Energy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University , Nanyang Drive, 637553 Singapore.,School of Materials Science and Engineering, Nanyang Technological University , Nanyang Avenue, 639798 Singapore
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Kumar M, Vezzoli S, Wang Z, Chaudhary V, Ramanujan RV, Gurzadyan GG, Bruno A, Soci C. Hot exciton cooling and multiple exciton generation in PbSe quantum dots. Phys Chem Chem Phys 2016; 18:31107-31114. [DOI: 10.1039/c6cp03790a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PbSe QDs show high multiple exciton generation (MEG) quantum yield. Here we have investigated the role of theΣtransition in slowing down the hot exciton cooling, which can help MEG to take over phonon relaxation.
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Affiliation(s)
- Manoj Kumar
- Division of Physics and Applied Physics
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
| | - Stefano Vezzoli
- Centre for Disruptive Photonic Technologies
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
| | - Zilong Wang
- Division of Physics and Applied Physics
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
| | - Varun Chaudhary
- Interdisciplinary Graduate School (IGS)
- Nanyang Technological University
- Singapore
- Singapore
- School of Materials Science and Engineering
| | - Raju V. Ramanujan
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Gagik G. Gurzadyan
- Division of Physics and Applied Physics
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
| | - Annalisa Bruno
- Energy Research Institute @ NTU (ERI@N)
- Research Techno Plaza
- Singapore
- Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
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Raavi SSK, Yin J, Grancini G, Soci C, Rao SV, Lanzani G, Giribabu L. Femtosecond to Microsecond Dynamics of Soret-Band Excited Corroles. J Phys Chem C Nanomater Interfaces 2015; 119:28691-28700. [PMID: 26631153 DOI: 10.1021/acs.jpcc.5b08235] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present a comprehensive photophysical investigation on a series of three corroles (TTC, P-TTC, Ge-TTC dissolved in toluene), employing femtosecond and nanosecond transient absorption spectroscopy (TAS) measurements. Systematic analyses of the TAS data determined the rates and corresponding time constants of photophysical processes: internal conversion (τIC) in the 898-525 fs range, vibrational relaxation (τ_VR) in the 7.44-13.6 ps range, intersystem crossing (τISC ) in the 033-1.09 ns range and triplet lifetime (τ_triplet) in the 0.8-3.5μs range. The estimated triplet quantum yields (ΦTriplet) were in the 0.42 - 0.61 range. Comparatively, GeTTC displayed faster τIC and higher(ΦTriplet). Additionally, the time-dependent density functional theory (DFT) calculations were performed for the three molecules. The HOMO/LUMO energy levels and the oscillator strengths of various transitions were determined and presented.
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Raavi SSK, Yin J, Grancini G, Soci C, Rao SV, Lanzani G, Giribabu L. Femtosecond to Microsecond Dynamics of Soret-Band Excited Corroles. J Phys Chem A 2015. [DOI: 10.1021/acs.jpca.5b08235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Krishna A, Sabba D, Yin J, Bruno A, Boix PP, Gao Y, Dewi HA, Gurzadyan GG, Soci C, Mhaisalkar SG, Grimsdale AC. Facile Synthesis of a Furan-Arylamine Hole-Transporting Material for High-Efficiency, Mesoscopic Perovskite Solar Cells. Chemistry 2015; 21:15113-7. [DOI: 10.1002/chem.201503099] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Indexed: 11/08/2022]
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