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Fieramosca A, Mastria R, Dini K, Dominici L, Polimeno L, Pugliese M, Prontera CT, De Marco L, Maiorano V, Todisco F, Ballarini D, De Giorgi M, Gigli G, Liew TCH, Sanvitto D. Origin of Exciton-Polariton Interactions and Decoupled Dark States Dynamics in 2D Hybrid Perovskite Quantum Wells. NANO LETTERS 2024. [PMID: 38925628 DOI: 10.1021/acs.nanolett.4c00418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
The realization of efficient optical devices depends on the ability to harness strong nonlinearities, which are challenging to achieve with standard photonic systems. Exciton-polaritons formed in hybrid organic-inorganic perovskites offer a promising alternative, exhibiting strong interactions at room temperature (RT). Despite recent demonstrations showcasing a robust nonlinear response, further progress is hindered by an incomplete understanding of the microscopic mechanisms governing polariton interactions in perovskite-based strongly coupled systems. Here, we investigate the nonlinear properties of quasi-2D dodecylammonium lead iodide perovskite (n3-C12) crystals embedded in a planar microcavity. Polarization-resolved pump-probe measurements reveal the contribution of indirect exchange interactions assisted by dark states formation. Additionally, we identify a strong dependence of the unique spin-dependent interaction of polaritons on sample detuning. The results are pivotal for the advancement of polaritonics, and the tunability of the robust spin-dependent anisotropic interaction in n3-C12 perovskites makes this material a powerful choice for the realization of polaritonic circuits.
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Affiliation(s)
- Antonio Fieramosca
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Rosanna Mastria
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Kevin Dini
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Lorenzo Dominici
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Laura Polimeno
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Marco Pugliese
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | | | - Luisa De Marco
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Vincenzo Maiorano
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Francesco Todisco
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Dario Ballarini
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Milena De Giorgi
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Giuseppe Gigli
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
- Department of Mathematics and Physics Ennio De Giorgi, University of Salento, Via Arnesano, Lecce 73100, Italy
| | - Timothy C H Liew
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Daniele Sanvitto
- CNR NANOTEC Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
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2
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Anantharaman SB, Lynch J, Stevens CE, Munley C, Li C, Hou J, Zhang H, Torma A, Darlington T, Coen F, Li K, Majumdar A, Schuck PJ, Mohite A, Harutyunyan H, Hendrickson JR, Jariwala D. Dynamics of self-hybridized exciton-polaritons in 2D halide perovskites. LIGHT, SCIENCE & APPLICATIONS 2024; 13:1. [PMID: 38161209 PMCID: PMC10757995 DOI: 10.1038/s41377-023-01334-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 10/25/2023] [Accepted: 11/10/2023] [Indexed: 01/03/2024]
Abstract
Excitons, bound electron-hole pairs, in two-dimensional hybrid organic inorganic perovskites (2D HOIPs) are capable of forming hybrid light-matter states known as exciton-polaritons (E-Ps) when the excitonic medium is confined in an optical cavity. In the case of 2D HOIPs, they can self-hybridize into E-Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the excitons. However, the fundamental properties of these self-hybridized E-Ps in 2D HOIPs, including their role in ultrafast energy and/or charge transfer at interfaces, remain unclear. Here, we demonstrate that >0.5 µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E-P modes. These E-Ps have high Q factors (>100) and modulate the optical dispersion for the crystal to enhance sub-gap absorption and emission. Through varying excitation energy and ultrafast measurements, we also confirm energy transfer from higher energy E-Ps to lower energy E-Ps. Finally, we also demonstrate that E-Ps are capable of charge transport and transfer at interfaces. Our findings provide new insights into charge and energy transfer in E-Ps opening new opportunities towards their manipulation for polaritonic devices.
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Affiliation(s)
- Surendra B Anantharaman
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.
| | - Jason Lynch
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Christopher E Stevens
- KBR Inc., Beavercreek, OH, 45431, USA
- Air Force Research Laboratory, Sensors Directorate, Wright-Patterson Air Force Base, OH, 45433, USA
| | - Christopher Munley
- Department of Physics, University of Washington, Seattle, WA, 98195, USA
| | - Chentao Li
- Department of Physics, Emory University, Atlanta, GA, 30322, USA
| | - Jin Hou
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, 77005, USA
- Department of Materials Science and Nanoengineering, Rice University, Houston, TX, 77005, USA
| | - Hao Zhang
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, 77005, USA
- Applied Physics Program, Smalley-Curl Institute, Rice University, Houston, TX, 77005, USA
| | - Andrew Torma
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, 77005, USA
- Applied Physics Program, Smalley-Curl Institute, Rice University, Houston, TX, 77005, USA
| | - Thomas Darlington
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Francis Coen
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Kevin Li
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Arka Majumdar
- Department of Physics, University of Washington, Seattle, WA, 98195, USA
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA, 98195, USA
| | - P James Schuck
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Aditya Mohite
- Department of Physics, Emory University, Atlanta, GA, 30322, USA
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, 77005, USA
| | - Hayk Harutyunyan
- Department of Physics, Emory University, Atlanta, GA, 30322, USA
| | - Joshua R Hendrickson
- Air Force Research Laboratory, Sensors Directorate, Wright-Patterson Air Force Base, OH, 45433, USA
| | - Deep Jariwala
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.
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3
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Singh S, Gong W, Stevens CE, Hou J, Singh A, Zhang H, Anantharaman SB, Mohite AD, Hendrickson JR, Yan Q, Jariwala D. Valley-Polarized Interlayer Excitons in 2D Chalcogenide-Halide Perovskite-van der Waals Heterostructures. ACS NANO 2023; 17:7487-7497. [PMID: 37010369 DOI: 10.1021/acsnano.2c12546] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Interlayer excitons (IXs) in two-dimensional (2D) heterostructures provide an exciting avenue for exploring optoelectronic and valleytronic phenomena. Presently, valleytronic research is limited to transition metal dichalcogenide (TMD) based 2D heterostructure samples, which require strict lattice (mis) match and interlayer twist angle requirements. Here, we explore a 2D heterostructure system with experimental observation of spin-valley layer coupling to realize helicity-resolved IXs, without the requirement of a specific geometric arrangement, i.e., twist angle or specific thermal annealing treatment of the samples in 2D Ruddlesden-Popper (2DRP) halide perovskite/2D TMD heterostructures. Using first-principle calculations, time-resolved and circularly polarized luminescence measurements, we demonstrate that Rashba spin-splitting in 2D perovskites and strongly coupled spin-valley physics in monolayer TMDs render spin-valley-dependent optical selection rules to the IXs. Consequently, a robust valley polarization of ∼14% with a long exciton lifetime of ∼22 ns is obtained in type-II band aligned 2DRP/TMD heterostructure at ∼1.54 eV measured at 80 K. Our work expands the scope for studying spin-valley physics in heterostructures of disparate classes of 2D semiconductors.
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Affiliation(s)
- Simrjit Singh
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Applied Physics and Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology, Eindhoven, 5612 AZ, The Netherlands
| | - Weiyi Gong
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States
| | - Christopher E Stevens
- Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, United States
- KBR Inc., Beavercreek, Ohio 45431, United States
| | - Jin Hou
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Aditya Singh
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Huiqin Zhang
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Surendra B Anantharaman
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Aditya D Mohite
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Joshua R Hendrickson
- Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, United States
| | - Qimin Yan
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States
| | - Deep Jariwala
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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4
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Room-temperature polariton quantum fluids in halide perovskites. Nat Commun 2022; 13:7388. [DOI: 10.1038/s41467-022-34987-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/14/2022] [Indexed: 12/02/2022] Open
Abstract
AbstractQuantum fluids exhibit quantum mechanical effects at the macroscopic level, which contrast strongly with classical fluids. Gain-dissipative solid-state exciton-polaritons systems are promising emulation platforms for complex quantum fluid studies at elevated temperatures. Recently, halide perovskite polariton systems have emerged as materials with distinctive advantages over other room-temperature systems for future studies of topological physics, non-Abelian gauge fields, and spin-orbit interactions. However, the demonstration of nonlinear quantum hydrodynamics, such as superfluidity and Čerenkov flow, which is a consequence of the renormalized elementary excitation spectrum, remains elusive in halide perovskites. Here, using homogenous halide perovskites single crystals, we report, in both one- and two-dimensional cases, the complete set of quantum fluid phase transitions from normal classical fluids to scatterless polariton superfluids and supersonic fluids—all at room temperature, clear consequences of the Landau criterion. Specifically, the supersonic Čerenkov wave pattern was observed at room temperature. The experimental results are also in quantitative agreement with theoretical predictions from the dissipative Gross-Pitaevskii equation. Our results set the stage for exploring the rich non-equilibrium quantum fluid many-body physics at room temperature and also pave the way for important polaritonic device applications.
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5
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Li S, Li X, Kocoj CA, Ji X, Yuan S, Macropulos EC, Stoumpos CC, Xia F, Mao L, Kanatzidis MG, Guo P. Ultrafast Excitonic Response in Two-Dimensional Hybrid Perovskites Driven by Intense Midinfrared Pulses. PHYSICAL REVIEW LETTERS 2022; 129:177401. [PMID: 36332259 DOI: 10.1103/physrevlett.129.177401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 08/05/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
Two-dimensional organic-inorganic hybrid perovskites (2DHPs) are natural quantum-well-like materials, in which strong quantum and dielectric confinement effects due to the organic spacers give rise to tightly bound excitons with large binding energy. To examine the mutual interactions between the organic spacer cations and the inorganic charge-residing octahedral framework in 2DHPs, here we perform femtosecond pump-probe spectroscopy by direct vibrational pumping of the organic spacers, followed by a visible-to-ultraviolet probe covering their excitonic resonances. Measurements on prototypical lead-bromide based 2DHP compounds, (BA)_{2}PbBr_{4} and (BA)_{2}(FA)Pb_{2}Br_{7} (BA^{+}=butylammonium; FA^{+}=formamidinium), reveal two distinct regimes of the temporal response. The first regime is dominated by a pump-induced transient expansion of the organic spacer layers that reduces the exciton oscillator strength, whereas the second regime arises from pump-induced lattice heating effects primarily associated with a spectral shift of the exciton energy. In addition, vibrational excitation enhances the biexciton emission, which we attribute to a stronger intralayer exciton confinement as well as vibrationally induced exciton detrapping from defect states. Our study provides fundamental insights regarding the impact of organic spacers on excitons in 2DHPs, as well as the excited-state dynamics and vibrational energy dissipation in these structurally diverse materials.
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Affiliation(s)
- Shunran Li
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
- Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, Connecticut 06516, USA
| | - Xiaotong Li
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
| | - Conrad A Kocoj
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
- Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, Connecticut 06516, USA
| | - Xiaoqin Ji
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Shaofan Yuan
- Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven, Connecticut 06511, USA
| | - Eleni C Macropulos
- Department of Materials Science and Technology, University of Crete, Voutes Campus, Heraklion 70013, Greece
| | - Constantinos C Stoumpos
- Department of Materials Science and Technology, University of Crete, Voutes Campus, Heraklion 70013, Greece
| | - Fengnian Xia
- Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven, Connecticut 06511, USA
| | - Lingling Mao
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Mercouri G Kanatzidis
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
| | - Peijun Guo
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
- Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, Connecticut 06516, USA
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6
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Canet-Albiach R, Kreĉmarová M, Bailach JB, Gualdrón-Reyes AF, Rodríguez-Romero J, Gorji S, Pashaei-Adl H, Mora-Seró I, Martínez Pastor JP, Sánchez-Royo JF, Muñoz-Matutano G. Revealing Giant Exciton Fine-Structure Splitting in Two-Dimensional Perovskites Using van der Waals Passivation. NANO LETTERS 2022; 22:7621-7627. [PMID: 36074722 DOI: 10.1021/acs.nanolett.2c02729] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Organic-inorganic layered perovskites are currently some of the most promising 2D van der Waals materials. Low crystal quality usually broadens the exciton line width, obscuring the fine structure of the exciton in conventional photoluminescence experiments. Here, we propose a mechanical approach to reducing the effect of spectral diffusion by means of hBN capping on layered perovskites, revealing the exciton fine structure. We used a stochastic model to link the reduction of the spectral line width with the population of charge fluctuation centers present in the organic spacer. van der Waals forces between both lattices cause the partial clamping of the perovskite organic spacer molecules, and hence the amplitude of the overall spectral diffusion effect is reduced. Our work provides a low-cost solution to the problem of accessing important fine-structure excitonic state information, along with an explanation of the important carrier dynamics present in the organic spacer that affect the quality of the optical emission.
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Affiliation(s)
- Rodolfo Canet-Albiach
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Marie Kreĉmarová
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - José Bosch Bailach
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Andrés F Gualdrón-Reyes
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
- Facultad de Ciencias, Instituto de Ciencias Químicas, Isla Teja, Universidad Austral de Chile, 5090000 Valdivia, Chile
| | - Jesús Rodríguez-Romero
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
- Facultad de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, C.U., Coyoacán, 04510 Mexico City, Mexico
| | - Setatira Gorji
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Hamid Pashaei-Adl
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Iván Mora-Seró
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
| | - Juan P Martínez Pastor
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
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7
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Mondal M, Dash AK, Singh A. Optical Microscope Based Universal Parameter for Identifying Layer Number in Two-Dimensional Materials. ACS NANO 2022; 16:14456-14462. [PMID: 36074897 DOI: 10.1021/acsnano.2c04833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Optical contrast is the most common preliminary method to identify layer number of two-dimensional (2D) materials, but it is seldom used as a confirmatory technique. We explain the reason for variation of optical contrast between imaging systems, motivating system-independent measurement of optical contrast as a critical need. We describe a universal method to quantify the layer number using the RGB (red-green-blue) and RAW optical images. For RGB images, the slope of 2D flake (MoS2, WSe2, graphene) intensity vs substrate intensity is extracted from optical images with varying lamp power. The intensity slope identifies layer number and is system independent. For RAW images, intensity slopes and intensity ratios are completely system and intensity independent. Intensity slope (for RGB) and intensity ratio (for RAW) are thus universal parameters for identifying layer number. The RAW format is not present in all imaging systems, but it can confirm layer number using a single optical image, making it a rapid and system-independent universal method. A Fresnel-reflectance-based optical model provides an excellent match with experiments. Furthermore, we have created a MATLAB-based graphical user interface that can identify layer number rapidly. This technique is expected to accelerate the preparation of heterostructures and to fulfill a prolonged need for universal optical contrast method.
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Affiliation(s)
- Mainak Mondal
- Department of Physics, Indian Institute of Science, Bengaluru 560012, India
| | - Ajit K Dash
- Department of Physics, Indian Institute of Science, Bengaluru 560012, India
| | - Akshay Singh
- Department of Physics, Indian Institute of Science, Bengaluru 560012, India
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8
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Transition metal dichalcogenide metaphotonic and self-coupled polaritonic platform grown by chemical vapor deposition. Nat Commun 2022; 13:5597. [PMID: 36151069 PMCID: PMC9508121 DOI: 10.1038/s41467-022-33088-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 09/01/2022] [Indexed: 11/08/2022] Open
Abstract
Transition metal dichalcogenides (TMDCs) have recently attracted growing attention in the fields of dielectric nanophotonics because of their high refractive index and excitonic resonances. Despite the recent realizations of Mie resonances by patterning exfoliated TMDC flakes, it is still challenging to achieve large-scale TMDC-based photonic structures with a controllable thickness. Here, we report a bulk MoS2 metaphotonic platform realized by a chemical vapor deposition (CVD) bottom-up method, supporting both pronounced dielectric optical modes and self-coupled polaritons. Magnetic surface lattice resonances (M-SLRs) and their energy-momentum dispersions are demonstrated in 1D MoS2 gratings. Anticrossing behaviors with Rabi splitting up to 170 meV are observed when the M-SLRs are hybridized with the excitons in multilayer MoS2. In addition, distinct Mie modes and anapole-exciton polaritons are also experimentally demonstrated in 2D MoS2 disk arrays. We believe that the CVD bottom-up method would open up many possibilities to achieve large-scale TMDC-based photonic devices and enrich the toolbox of engineering exciton-photon interactions in TMDCs.
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9
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Zhang Q, Krisnanda T, Giovanni D, Dini K, Ye S, Feng M, Liew TCH, Sum TC. Electric Field Modulation of 2D Perovskite Excitonics. J Phys Chem Lett 2022; 13:7161-7169. [PMID: 35904326 DOI: 10.1021/acs.jpclett.2c01792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Multiquantum-well (MQW) perovskite is one of the forerunners in high-efficiency perovskite LED (PeLEDs) research. Despite the rapid inroads, PeLEDs suffer from the pertinent issue of efficiency decrease with increasing brightness, commonly known as "efficiency roll-off". The underlying mechanisms are presently an open question. Herein, we explicate the E-field effects on the exciton states in the archetypal MQW perovskite (C6H5C2H4NH3)2PbI4, or PEPI, in a device-like architecture using field-assisted transient spectroscopy and theoretical modeling. The applied E-field results in a complex interplay of spectral blueshifts and enhancement/quenching of the different exciton modes. The former originates from the DC Stark shift, while the latter is attributed to the E-field modulation of the transfer rates between bright/dark exciton modes. Importantly, our findings uncover crucial insights into the photophysical processes under E-field modulation contributing to efficiency roll-off in MQW PeLEDs. Electrical modulation of exciton properties presents exciting possibilities for signal processing devices.
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Affiliation(s)
- Qiannan Zhang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Tanjung Krisnanda
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - David Giovanni
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- KLA-Tencor (Singapore) Pte. Ltd., 4 Serangoon North Avenue 5, Singapore 554532, Singapore
| | - Kevin Dini
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Senyun Ye
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Minjun Feng
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Timothy C H Liew
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- MajuLab, International Joint Research Unit UMI 3654, CNRS, Universite Côte d'Azur, Sorbonne Universite, National University of Singapore, and Nanyang Technological University, Singapore 637371, 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
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10
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Prediction of Strong Transversal s(TE) Exciton–Polaritons in C60 Thin Crystalline Films. Int J Mol Sci 2022; 23:ijms23136943. [PMID: 35805945 PMCID: PMC9266707 DOI: 10.3390/ijms23136943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/20/2022] [Accepted: 06/20/2022] [Indexed: 12/10/2022] Open
Abstract
If an exciton and a photon can change each other’s properties, indicating that the regime of their strong bond is achieved, it usually happens in standard microcavity devices, where the large overlap between the ’confined’ cavity photons and the 2D excitons enable the hybridization and the band gap opening in the parabolic photonic branch (as clear evidence of the strong exciton–photon coupling). Here, we show that the strong light–matter coupling can occur beyond the microcavity device setup, i.e., between the ’free’ s(TE) photons and excitons. The s(TE) exciton–polariton is a polarization mode, which (contrary to the p(TM) mode) appears only as a coexistence of a photon and an exciton, i.e., it vanishes in the non-retarded limit (c→∞). We show that a thin fullerene C60 crystalline film (consisting of N C60 single layers) deposited on an Al2O3 dielectric surface supports strong evanescent s(TE)-polarized exciton–polariton. The calculated Rabi splitting is more than Ω=500 meV for N=10, with a tendency to increase with N, indicating a very strong photonic character of the exciton–polariton.
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11
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Yang G, Dev SU, Allen MS, Allen JW, Harutyunyan H. Optical Bound States in the Continuum Enabled by Magnetic Resonances Coupled to a Mirror. NANO LETTERS 2022; 22:2001-2008. [PMID: 35175777 DOI: 10.1021/acs.nanolett.1c04764] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Dielectric metasurfaces made of high refractive index and low optical loss materials have emerged as promising platforms to achieve high-quality factor modes enabling strong light-matter interaction. Bound states in the continuum have shown potential to demonstrate narrow spectral resonances but often require asymmetric geometry and typically feature strong polarization dependence, complicating fabrication and limiting practical applications. We introduce a novel approach for designing high-quality bound states in the continuum using magnetic dipole resonances coupled to a mirror. The resulting metasurface has simple geometric parameters requiring no broken symmetry. To demonstrate the unique features of our photonic platform we show a record-breaking third harmonic generation efficiency from the metasurface benefiting from the strongly enhanced electric field at high-quality resonances. Our approach mitigates the shortcomings of previous platforms with simple geometry enabling facile and large-area fabrication of metasurfaces paving the way for applications in optical sensing, detection, quantum photonics, and nonlinear devices.
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Affiliation(s)
- Guoce Yang
- Department of Physics, Emory University, Atlanta, Georgia 30322, United States
| | - Sukrith U Dev
- Air Force Research Laboratory, Munitions Directorate, Eglin AFB, Florida 32542, United States
| | - Monica S Allen
- Air Force Research Laboratory, Munitions Directorate, Eglin AFB, Florida 32542, United States
| | - Jeffery W Allen
- Air Force Research Laboratory, Munitions Directorate, Eglin AFB, Florida 32542, United States
| | - Hayk Harutyunyan
- Department of Physics, Emory University, Atlanta, Georgia 30322, United States
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