1
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Ji S, Zeng M, Zhan X, Liu H, Zhou Y, Wang K, Yan Y, Yao J, Zhao YS. Exceptionally High- glum Circularly Polarized Lasers Empowered by Strong 2D-Chiroptical Response in a Host-Guest Supramolecular Microcrystal. J Am Chem Soc 2024; 146:22583-22589. [PMID: 39102645 DOI: 10.1021/jacs.4c06903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
Circularly polarized (CP) lasers hold tremendous potential for advancing spin information communication and display technologies. Organic materials are emerging candidates for high-performance CP lasers because of their abundant chiral structures and excellent gain characteristics. However, their dissymmetry factor (glum) in CP emission is typically low due to the weak chiral light matter interactions. Here, we presented an effective approach to significantly amplifying glum by leveraging the intrinsic 2D-chiroptical response of an anisotropic organic supramolecular crystal. The organic complex microcrystal was designed to exhibit large 2D-chiroptical activities through strong coupling interactions between their remarkable linear birefringence (LB) and high degree of fluorescence linear polarization. Such 2D-chiroptical response can be further enhanced by the stimulated emission resulted from an increased degree of linear polarization, yielding a nearly pure CP laser with an exceptionally high glum of up to 1.78. Moreover, exploiting the extreme susceptibility of LB to temperature, we demonstrate a prototype of temperature-controlled chiroptical switches. These findings offer valuable insights for harnessing organic crystals to facilitate the development of high-performance CP lasers and other chiroptical devices.
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Affiliation(s)
- Shiyang Ji
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Min Zeng
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Xiuqin Zhan
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Haidi Liu
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yifan Zhou
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kang Wang
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongli Yan
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jiannian Yao
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yong Sheng Zhao
- Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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2
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Tan L, Fu W, Gao Q, Wang PP. Chiral Plasmonic Hybrid Nanostructures: A Gateway to Advanced Chiroptical Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309033. [PMID: 37944554 DOI: 10.1002/adma.202309033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/04/2023] [Indexed: 11/12/2023]
Abstract
Chirality introduces a new dimension of functionality to materials, unlocking new possibilities across various fields. When integrated with plasmonic hybrid nanostructures, this attribute synergizes with plasmonic and other functionalities, resulting in unprecedented chiroptical materials that push the boundaries of the system's capabilities. Recent advancements have illuminated the remarkable chiral light-matter interactions within chiral plasmonic hybrid nanomaterials, allowing for the harnessing of their tunable optical activity and hybrid components. These advancements have led to applications in areas such as chiral sensing, catalysis, and spin optics. Despite these promising developments, there remains a need for a comprehensive synthesis of the current state-of-the-art knowledge, as well as a thorough understanding of the construction techniques and practical applications in this field. This review begins with an exploration of the origins of plasmonic chirality and an overview of the latest advancements in the synthesis of chiral plasmonic hybrid nanostructures. Furthermore, representative emerging categories of hybrid nanomaterials are classified and summarized, elucidating their versatile applications. Finally, the review engages with the fundamental challenges associated with chiral plasmonic hybrid nanostructures and offer insights into the future prospects of this advanced field.
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Affiliation(s)
- Lili Tan
- State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Wenlong Fu
- State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Qi Gao
- State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Peng-Peng Wang
- State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
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3
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Endo K, Hashiyada S, Narushima T, Togawa Y, Okamoto H. Circular dichroism of pseudo-two-dimensional metal nanostructures: Rotational symmetry and reciprocity. J Chem Phys 2023; 159:234706. [PMID: 38112510 DOI: 10.1063/5.0178943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 11/28/2023] [Indexed: 12/21/2023] Open
Abstract
Circular dichroism (CD) spectra for pseudo-two-dimensional chiral nanomaterials were systematically investigated and analyzed in relation to the rotational symmetry of the nanomaterials. Theoretically, an ideal two-dimensional chiral matter is CD inactive for light incident normal to the plane if it possesses threefold or higher rotational symmetry. If the matter has two- or onefold rotational symmetry, it should exhibit CD activity, and the CD signal measured from the back side of the matter is expected to be inverted from that measured from the front side. For pseudo-two-dimensional chiral gold nanostructures fabricated on glass substrates using electron beam lithography, matter with fourfold rotational symmetry is found to be CD active, even when special care is taken to ensure that the optical environments for the front and back sides of the sample are equivalent. In this case, the CD signal measured from the back side is found to be almost exactly the same as that measured from the front side. It is revealed that the observed chiro-optical behavior arises from three-dimensional chiral characteristics due to differences in the surface shape between the front and back sides of the structures. For matter that is two- or onefold rotationally symmetric, the CD signal measured from the back side is not coincident with that from the front side. For certain wavelength regions, the CD signals measured from the front side and back side are observed to be similar, while at other wavelengths, the inverted component of the CD signals is found to dominate. The observed CD spectral behavior for reciprocal optical measurement configurations is considered to be determined by a balance between the in-plane isotropic and anisotropic components of the chiral permittivity.
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Affiliation(s)
- Kensaku Endo
- Department of Physics and Electronics, School of Engineering, Osaka Metropolitan University, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Shun Hashiyada
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The Graduate University of Advanced Studies (Sokendai), Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Tetsuya Narushima
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The Graduate University of Advanced Studies (Sokendai), Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Yoshihiko Togawa
- Department of Physics and Electronics, School of Engineering, Osaka Metropolitan University, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hiromi Okamoto
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The Graduate University of Advanced Studies (Sokendai), Myodaiji, Okazaki, Aichi 444-8585, Japan
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4
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Koyroytsaltis-McQuire DJP, Kumar R, Javorfi T, Siligardi G, Gadegaard N, Kadodwala M. Tuning dipolar and multipolar resonances of chiral silicon nanostructures for control of near field superchirality. NANOSCALE 2023; 16:110-122. [PMID: 38063462 DOI: 10.1039/d3nr05285k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Chiral materials display a property called optical activity, which is the capability to interact differentially with left and right circularly polarised light. This leads to the ability to manipulate the polarisation state of light, which has a broad range of applications spanning from energy efficient displays to quantum technologies. Both synthesised and engineered chiral nanomaterials are exploited in such devices. The design strategy for optimising the optical activity of a chiral material is typically based on maximising a single parameter, the electric dipole-magnetic dipole response. Here we demonstrate an alternative approach of controlling optical activity by manipulating both the dipole and multipolar response of a nanomaterial. This provides an additional parameter for material design, affording greater flexibility. The exemplar systems used to illustrate the strategy are nanofabricated chiral silicon structures. The multipolar response of the structures, and hence their optical activity, can be controlled simply by varying their height. This phenomenon allows optical activity and the creation of so called superchiral fields, with enhanced asymmetries, to be controlled over a broader wavelength range, than is achievable with just the electric dipole-magnetic dipole response. This work adds to the material design toolbox providing a route to novel nanomaterials for optoelectronics and sensing applications.
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Affiliation(s)
| | - Rahul Kumar
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Tamas Javorfi
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, UK
| | - Giuliano Siligardi
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, UK
| | - Nikolaj Gadegaard
- School of Engineering, Rankine Building, University of Glasgow, Glasgow G12 8LT, UK
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5
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Amboli J, Gallas B, Demésy G, Bonod N. Design and analysis of chiral and achiral metasurfaces with the finite element method. OPTICS EXPRESS 2023; 31:43147-43162. [PMID: 38178416 DOI: 10.1364/oe.500540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 11/09/2023] [Indexed: 01/06/2024]
Abstract
The rise of metasurfaces to manipulate the polarization states of light motivates the development of versatile numerical methods able to model and analyze their polarimetric properties. Here we make use of a scattered-field formulation well suited to the Finite Element Method (FEM) to compute the Stokes-Mueller matrix of metasurfaces. The major advantage of the FEM lies in its versatility and its ability to compute the optical properties of structures with arbitrary and realistic shapes, and rounded edges and corners. We benefit from this method to design achiral, pseudo-chiral, and chiral metasurfaces with specific polarimetric properties. We compute and analyze their Mueller matrices. The accuracy of this method is assessed for both dielectric and metallic scatterers hosting Mie and plasmonic resonances.
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6
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Wu X, Feng Z, Zhao X, Lin F, Fang Z. Full-space and multi-polarization holograms realized by a non-Hermitian bilayer metasurface. OPTICS LETTERS 2023; 48:6044-6047. [PMID: 37966785 DOI: 10.1364/ol.502600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 10/31/2023] [Indexed: 11/16/2023]
Abstract
Multilayer metasurfaces break the mirror symmetry along the path of light propagation, thereby increasing the potential for light manipulation. Herein, a paradigm is proposed that building a non-Hermitian bilayer metasurface, which is composed of two identical, orthogonally oriented, chiral J-shaped Au structures in each layer, allows exceptional points (EPs) to exist in full-space. Specifically, in the reflected half-space that adheres to mirror symmetry, the circularly polarized eigenstates coalesce at the EP, while in the transmission half-space, where mirror symmetry is broken, the linearly polarized eigenstates converge at the EP. By considering the intrinsic property of topologically protected 2π-phase accumulation encircling both EPs, we investigated full-space holography through using circularly polarized light (in reflection half-space) and linearly polarized light (in transmission half-space).
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7
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Yamanishi J, Ahn HY, Okamoto H. Nanoscopic Observation of Chiro-Optical Force. NANO LETTERS 2023; 23:9347-9352. [PMID: 37792311 PMCID: PMC10607231 DOI: 10.1021/acs.nanolett.3c02534] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/24/2023] [Indexed: 10/05/2023]
Abstract
Nanoscopic observation of chiro-optical phenomena is essential in wide scientific areas but has measurement difficulties; hence, its physics is still unknown. To obtain a full understanding of the physics of chiro-optical systems and derive the full potentials, it is essential to perform an in situ observation of the chiro-optical effect from the individual parts because the macroscopic chiro-optical effect cannot be translated directly into microscopic effects. In the present study, we observed the chiro-optical responses at the nanoscale level by detecting the chiro-optical forces, which were generated by illumination of the material-probe system with circularly polarized light. The induced optical force was dependent on the handedness and wavelength of the incident circularly polarized light and was well correlated to the electromagnetically simulated differential intensity of the longitudinal electric field. Our results facilitate the clarification of chiro-optical phenomena at the nanoscale level and could innovate chiro-optical nanotechnologies.
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Affiliation(s)
- Junsuke Yamanishi
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Hyo-Yong Ahn
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Center
for Novel Science Initiatives, National
Institutes of Natural Sciences, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan
| | - Hiromi Okamoto
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The
Graduate University for Advanced Studies (Sokendai), 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
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8
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Gryb D, Wendisch FJ, Aigner A, Gölz T, Tittl A, de S. Menezes L, Maier SA. Two-Dimensional Chiral Metasurfaces Obtained by Geometrically Simple Meta-atom Rotations. NANO LETTERS 2023; 23:8891-8897. [PMID: 37726256 PMCID: PMC10571149 DOI: 10.1021/acs.nanolett.3c02168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/21/2023] [Indexed: 09/21/2023]
Abstract
Two-dimensional chiral metasurfaces seem to contradict Lord Kelvin's geometric definition of chirality since they can be made to coincide by performing rotational operations. Nevertheless, most planar chiral metasurface designs often use complex meta-atom shapes to create flat versions of three-dimensional helices, although the visual appearance does not improve their chiroptical response but complicates their optimization and fabrication due to the resulting large parameter space. Here we present one of the geometrically simplest two-dimensional chiral metasurface platforms consisting of achiral dielectric rods arranged in a square lattice. Chirality is created by rotating the individual meta-atoms, making their arrangement chiral and leading to chiroptical responses that are stronger or comparable to more complex designs. We show that resonances depending on the arrangement are robust against geometric variations and behave similarly in experiments and simulations. Finally, we explain the origin of chirality and behavior of our platform by simple considerations of the geometric asymmetry and gap size.
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Affiliation(s)
- Dmytro Gryb
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Fedja J. Wendisch
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Andreas Aigner
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Thorsten Gölz
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Andreas Tittl
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Leonardo de S. Menezes
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
- Departamento
de Física, Universidade Federal de
Pernambuco, 50670-901 Recife, PE, Brazil
| | - Stefan A. Maier
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
- School
of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
- Department
of Physics, Imperial College London, London SW7 2AZ, United Kingdom
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9
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Wang Z, Lin CC, Murata K, Kamal ASA, Lin BW, Chen MH, Tang S, Ho YL, Chen CC, Chen CW, Daiguji H, Ishii K, Delaunay JJ. Chiroptical Response Inversion and Enhancement of Room-Temperature Exciton-Polaritons Using 2D Chirality in Perovskites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303203. [PMID: 37587849 DOI: 10.1002/adma.202303203] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 08/08/2023] [Indexed: 08/18/2023]
Abstract
Although chiral semiconductors have shown promising progress in direct circularly polarized light (CPL) detection and emission, they still face potential challenges. A chirality-switching mechanism or approach integrating two enantiomers is needed to discriminate the handedness of a given CPL; additionally, a large material volume is required for sufficient chiroptical interaction. These two requirements pose significant obstacles to the simplification and miniaturization of the devices. Here, room-temperature chiral polaritons fulfilling dual-handedness functions and exhibiting a more-than-two-order enhancement of the chiroptical signal are demonstrated, by embedding a 40 nm-thick perovskite film with a 2D chiroptical effect into a Fabry-Pérot cavity. By mixing chiral perovskites with different crystal structures, a pronounced 2D chiroptical effect is accomplished in the perovskite film, featured by an inverted chiroptical response for counter-propagating CPL. This inversion behavior matches the photonic handedness switch during CPL circulation in the Fabry-Pérot cavity, thus harvesting giant enhancement of the chiroptical response. Furthermore, affected by the unique quarter-wave-plate effects, the polariton emission achieves a chiral dissymmetry of ±4% (for the emission from the front and the back sides). The room-temperature polaritons with the strong dissymmetric chiroptical interaction shall have implications on a fundamental level and future on-chip applications for biomolecule analysis and quantum computing.
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Affiliation(s)
- Zhiyu Wang
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Cheng-Chieh Lin
- Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan
| | - Kei Murata
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
| | | | - Bo-Wei Lin
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Mu-Hsin Chen
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Siyi Tang
- Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Ya-Lun Ho
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Chia-Chun Chen
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Chow Rd., Taipei, 11677, Taiwan
| | - Chun-Wei Chen
- Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan
| | - Hirofumi Daiguji
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kazuyuki Ishii
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
| | - Jean-Jacques Delaunay
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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10
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Achouri K, Chung M, Kiselev A, Martin OJF. Multipolar Pseudochirality-Induced Optical Torque. ACS PHOTONICS 2023; 10:3275-3282. [PMID: 37743946 PMCID: PMC10515695 DOI: 10.1021/acsphotonics.3c00696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Indexed: 09/26/2023]
Abstract
It has been observed that achiral nanoparticles, such as flat helices, may be subjected to an optical torque even when illuminated by normally incident linearly polarized light. However, the origin of this fascinating phenomenon has so far remained mostly unexplained. We therefore propose an exhaustive discussion that provides a clear and rigorous explanation for the existence of such a torque. Using multipolar theory and taking into account nonlocal interactions, we find that this torque stems from multipolar pseudochiral responses that generate both spin and orbital angular momenta. We also show that the nature of these peculiar responses makes them particularly dependent on the asymmetry of the particles. By elucidating the origin of this type of torque, this work may prove instrumental for the design of high-performance nano-rotors.
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Affiliation(s)
- Karim Achouri
- Nanophotonics and Metrology Laboratory, Institute of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne, Route Cantonale, 1015 Lausanne, Switzerland
| | - Mintae Chung
- Nanophotonics and Metrology Laboratory, Institute of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne, Route Cantonale, 1015 Lausanne, Switzerland
| | - Andrei Kiselev
- Nanophotonics and Metrology Laboratory, Institute of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne, Route Cantonale, 1015 Lausanne, Switzerland
| | - Olivier J. F. Martin
- Nanophotonics and Metrology Laboratory, Institute of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne, Route Cantonale, 1015 Lausanne, Switzerland
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11
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Han JH, Kim D, Kim J, Kim G, Fischer P, Jeong HH. Plasmonic Nanostructure Engineering with Shadow Growth. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2107917. [PMID: 35332960 DOI: 10.1002/adma.202107917] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Physical shadow growth is a vacuum deposition technique that permits a wide variety of 3D-shaped nanoparticles and structures to be fabricated from a large library of materials. Recent advances in the control of the shadow effect at the nanoscale expand the scope of nanomaterials from spherical nanoparticles to complex 3D shaped hybrid nanoparticles and structures. In particular, plasmonically active nanomaterials can be engineered in their shape and material composition so that they exhibit unique physical and chemical properties. Here, the recent progress in the development of shadow growth techniques to realize hybrid plasmonic nanomaterials is discussed. The review describes how fabrication permits the material response to be engineered and highlights novel functions. Potential fields of application with a focus on photonic devices, biomedical, and chiral spectroscopic applications are discussed.
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Affiliation(s)
- Jang-Hwan Han
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Doeun Kim
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Juhwan Kim
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Gyurin Kim
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Peer Fischer
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Hyeon-Ho Jeong
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
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12
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Ali H, Petronijevic E, Pellegrini G, Sibilia C, Andreani LC. Circular dichroism in a plasmonic array of elliptical nanoholes with square lattice. OPTICS EXPRESS 2023; 31:14196-14211. [PMID: 37157289 DOI: 10.1364/oe.485324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Chiral properties of plasmonic metasurfaces, especially related to different absorption of left and right circularly polarized light leading to circular dichroism (CD), are a research hot topic in nanophotonics. There is often a need to understand the physical origin of CD for different chiral metasurfaces, and to get guidelines for the design of structures with optimized and robust CD. In this work, we numerically study CD at normal incidence in square arrays of elliptic nanoholes etched in thin metallic layers (Ag, Au, Al) on a glass substrate and tilted with respect to the symmetry axes. Strong CD arises in absorption spectra at the same wavelength region of extraordinary optical transmission, indicating highly resonant coupling between light and surface plasmon polaritons at the metal/glass and metal/air interfaces. We elucidate the physical origin of absorption CD by a careful comparison of optical spectra for different polarizations (linear and circular), with the aid of static and dynamic simulations of local enhancement of the electric field. Furthermore, we optimize the CD as a function of the ellipse parameters (diameters and tilt), the thickness of the metallic layer, and the lattice constant. We find that silver and gold metasurfaces are most useful for CD resonances above 600 nm, while aluminum metasurfaces are convenient for achieving strong CD resonances in the short-wavelength range of the visible regime and in the near UV. The results give a full picture of chiral optical effects at normal incidence in this simple nanohole array, and suggest interesting applications for chiral biomolecules sensing in such plasmonic geometries.
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13
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Mendoza-Carreño J, Molet P, Otero-Martínez C, Alonso MI, Polavarapu L, Mihi A. Nanoimprinted 2D-Chiral Perovskite Nanocrystal Metasurfaces for Circularly Polarized Photoluminescence. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2210477. [PMID: 36657020 DOI: 10.1002/adma.202210477] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/20/2022] [Indexed: 06/17/2023]
Abstract
The versatile hybrid perovskite nanocrystals (NCs) are one of the most promising materials for optoelectronics by virtue of their tunable bandgaps and high photoluminescence (PL) quantum yields. However, their inherent crystalline chemical structure limits the chiroptical properties achievable with the material. The production of chiral perovskites has become an active field of research for its promising applications in optics, chemistry, or biology. Typically, chiral halide perovskites are obtained by the incorporation of different chiral moieties in the material. Unfortunately, these chemically modified perovskites have demonstrated moderate values of chiral PL so far. Here, a general and scalable approach is introduced to produce chiral PL from arbitrary nanoemitters assembled into 2D-chiral metasurfaces. The fabrication via nanoimprinting lithography employs elastomeric molds engraved with chiral motifs covering millimeter areas that are used to pattern two types of unmodified colloidal perovskite NC inks: green-emissive CsPbBr3 and red-emissive CsPbBr1 I2 . The perovskite 2D-metasurfaces exhibit remarkable PL dissymmetry factors (glum ) of 0.16 that can be further improved up to glum of 0.3 by adding a high-refractive-index coating on the metasurfaces. This scalable approach to produce chiral photoluminescent thin films paves the way for the seamless production of bright chiral light sources for upcoming optoelectronic applications.
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Affiliation(s)
- Jose Mendoza-Carreño
- Institute of Materials Science of Barcelona ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
| | - Pau Molet
- Institute of Materials Science of Barcelona ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
| | - Clara Otero-Martínez
- CINBIO, Universidade de Vigo, Department of Physical Chemistry, Materials Chemistry and Physics Group, Campus Universitario As Lagoas, Vigo, 36310, Spain
| | - Maria Isabel Alonso
- Institute of Materials Science of Barcelona ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
| | - Lakshminarayana Polavarapu
- CINBIO, Universidade de Vigo, Department of Physical Chemistry, Materials Chemistry and Physics Group, Campus Universitario As Lagoas, Vigo, 36310, Spain
| | - Agustín Mihi
- Institute of Materials Science of Barcelona ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
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14
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Spaeth P, Adhikari S, Heyvaert W, Zhuo X, García I, Liz-Marzán LM, Bals S, Orrit M, Albrecht W. Photothermal Circular Dichroism Measurements of Single Chiral Gold Nanoparticles Correlated with Electron Tomography. ACS PHOTONICS 2022; 9:3995-4004. [PMID: 36573165 PMCID: PMC9783064 DOI: 10.1021/acsphotonics.2c01457] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Indexed: 06/17/2023]
Abstract
Chemically synthesized metal nanoparticles with morphological chiral features are known to exhibit strong circular dichroism. However, we still lack understanding of the correlation between morphological and chiroptical features of plasmonic nanoparticles. To shed light on that question, single nanoparticle experiments are required. We performed photothermal circular dichroism measurements of single chiral and achiral gold nanoparticles and correlated the chiroptical response to the 3D morphology of the same nanoparticles retrieved by electron tomography. In contrast to an ensemble measurement, we show that individual particles within the ensemble display a broad distribution of strength and handedness of circular dichroism signals. Whereas obvious structural chiral features, such as helical wrinkles, translate into chiroptical ones, nanoparticles with less obvious chiral morphological features can also display strong circular dichroism signals. Interestingly, we find that even seemingly achiral nanoparticles can display large g-factors. The origin of this circular dichroism signal is discussed in terms of plasmonics and other potentially relevant factors.
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Affiliation(s)
- Patrick Spaeth
- Huygens-Kamerlingh
Onnes Laboratory, Leiden University, 2300Leiden, RA, The Netherlands
- Department
of Sustainable Energy Materials, AMOLF, Science Park 104, 1098Amsterdam, XG, The Netherlands
| | - Subhasis Adhikari
- Huygens-Kamerlingh
Onnes Laboratory, Leiden University, 2300Leiden, RA, The Netherlands
| | - Wouter Heyvaert
- EMAT
and NANOlab Center of Excellence, University
of Antwerp, Groenenborgerlaan
171, B-2020Antwerp, Belgium
| | - Xiaolu Zhuo
- Basque
Research and Technology Alliance (BRTA), CIC biomaGUNE, Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
- School
of Science Engineering, The Chinese University
of Hong Kong (Shenzhen), Shenzhen518172, China
| | - Isabel García
- Basque
Research and Technology Alliance (BRTA), CIC biomaGUNE, Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
| | - Luis M. Liz-Marzán
- Basque
Research and Technology Alliance (BRTA), CIC biomaGUNE, Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Paseo de Miramón 182, 20014Donostia-San Sebastián, Spain
- Ikerbasque
(Basque Foundation for Science), 48009Bilbao, Spain
| | - Sara Bals
- EMAT
and NANOlab Center of Excellence, University
of Antwerp, Groenenborgerlaan
171, B-2020Antwerp, Belgium
| | - Michel Orrit
- Huygens-Kamerlingh
Onnes Laboratory, Leiden University, 2300Leiden, RA, The Netherlands
| | - Wiebke Albrecht
- Huygens-Kamerlingh
Onnes Laboratory, Leiden University, 2300Leiden, RA, The Netherlands
- Department
of Sustainable Energy Materials, AMOLF, Science Park 104, 1098Amsterdam, XG, The Netherlands
- EMAT
and NANOlab Center of Excellence, University
of Antwerp, Groenenborgerlaan
171, B-2020Antwerp, Belgium
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15
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Kim RM, Huh JH, Yoo S, Kim TG, Kim C, Kim H, Han JH, Cho NH, Lim YC, Im SW, Im E, Jeong JR, Lee MH, Yoon TY, Lee HY, Park QH, Lee S, Nam KT. Enantioselective sensing by collective circular dichroism. Nature 2022; 612:470-476. [PMID: 36517715 DOI: 10.1038/s41586-022-05353-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 09/15/2022] [Indexed: 12/23/2022]
Abstract
Quantitative determination and in situ monitoring of molecular chirality at extremely low concentrations is still challenging with simple optics because of the molecular-scale mismatch with the incident light wavelength. Advances in spectroscopy1-4 and nanophotonics have successfully lowered the detection limit in enantioselective sensing, as it can bring the microscopic chiral characteristics of molecules into the macroscopic scale5-7 or squeeze the chiral light into the subwavelength scale8-17. Conventional nanophotonic approaches depend mainly on the optical helicity density8,9 by localized resonances within an individual structure, such as localized surface plasmon resonances (LSPRs)10-16 or dielectric Mie resonances17. These approaches use the local chiral hotspots in the immediate vicinity of the structure, whereas the handedness of these hotspots varies spatially. As such, these localized resonance modes tend to be error-prone to the stochasticity of the target molecular orientations, vibrations and local concentrations18,19. Here we identified enantioselective characteristics of collective resonances (CRs)20 arising from assembled 2D crystals of isotropic, 432-symmetric chiral gold nanoparticles (helicoids)21,22. The CRs exhibit a strong and uniform chiral near field over a large volume above the 2D crystal plane, resulting from the collectively spinning, optically induced dipoles at each helicoid. Thus, energy redistribution by molecular back action on the chiral near field shifts the CRs in opposite directions, depending on the handedness of the analyte, maximizing the modulation of the collective circular dichroism (CD).
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Affiliation(s)
- Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Ji-Hyeok Huh
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea
| | - SeokJae Yoo
- Department of Physics, Inha University, Incheon, Republic of Korea
| | - Tae Gyun Kim
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea.,Institute for Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Changwon Kim
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea.,Institute for Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Jeong Hyun Han
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Yae-Chan Lim
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - EunJi Im
- Department of Biomicrosystem Technology, Korea University, Seoul, Republic of Korea
| | - Jae Ryeol Jeong
- Department of Applied Chemistry, Kyung Hee University, Seoul, Republic of Korea
| | - Min Hyung Lee
- Department of Applied Chemistry, Kyung Hee University, Seoul, Republic of Korea
| | - Tae-Young Yoon
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea.,Institute for Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Ho-Young Lee
- Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Q-Han Park
- Department of Physics, Korea University, Seoul, Republic of Korea.
| | - Seungwoo Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea. .,Department of Biomicrosystem Technology, Korea University, Seoul, Republic of Korea. .,Department of Integrative Energy Engineering, Korea University, Seoul, Republic of Korea.
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea.
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16
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Ma L, Liu Y, Han C, Movsesyan A, Li P, Li H, Tang P, Yuan Y, Jiang S, Ni W, Yan H, Govorov AO, Wang ZM, Lan X. DNA-Assembled Chiral Satellite-Core Nanoparticle Superstructures: Two-State Chiral Interactions from Dynamic and Static Conformations. NANO LETTERS 2022; 22:4784-4791. [PMID: 35649094 DOI: 10.1021/acs.nanolett.2c01047] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A significant challenge exists in obtaining chiral nanostructures that are amenable to both solution-phase self-assembly and solid-phase preservation, which enable the observation of unveiled optical responses impacted by the dynamic or static conformation and the incident excitations. Here, to meet this demand, we employed DNA origami technology to create quasi-planar chiral satellite-core nanoparticle superstructures with an intermediate geometry between the monolayer and the double layer. We disentangled the complex chiral mechanisms, which include planar chirality, 3D chirality, and induced chirality transfer, through combined theoretical studies and thorough experimental measurements of both solution- and solid-phase samples. Two distinct states of optical responses were demonstrated by the dynamic and static conformations, involving a split or nonsplit circular dichroism (CD) line shape. More importantly, our study on chiral nanoparticle superstructures on a substrate featuring both a dominant 2D geometry and a defined 3D represents a great leap toward the realization of colloidal chiral metasurfaces.
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Affiliation(s)
- Li Ma
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang 313001, China
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
| | - Yan Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Cong Han
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Artur Movsesyan
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- Department of Physics and Astronomy and the Nanoscale & Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, United States
| | - Peihang Li
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang 313001, China
| | - Huacheng Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Pan Tang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Yongqing Yuan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Shuoxing Jiang
- Center for Molecular Design and Biomimetics, The Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Weihai Ni
- Jiangsu Key Laboratory of Thin Films, School of Physical Science and Technology, Soochow University, Suzhou, Jiangsu 215006, China
| | - Hao Yan
- Center for Molecular Design and Biomimetics, The Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Alexander O Govorov
- Department of Physics and Astronomy and the Nanoscale & Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, United States
| | - Zhiming M Wang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang 313001, China
| | - Xiang Lan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
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17
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Cao Z, Chen J, Deng S, Chen H. A physical interpretation of coupling chiral metaatoms. NANOSCALE 2022; 14:3849-3857. [PMID: 35195644 DOI: 10.1039/d1nr05065f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The physical origins of chiroptical responses from artificial optically active media are significant for developing high-performance circular dichroism (CD) spectroscopic techniques. Here, we present a biorthogonal approach based on temporal coupled-mode theory to unravel the underlying physics of chiral metasurfaces. Equipped with physically meaningful parameters, this approach inherits the intrinsic properties of open optical cavities, including time-reversal symmetry and non-Hermitian Hamiltonians, which are found to be in excellent agreement with numerical results. Remarkably, it identifies that the intrinsic chirality of coupled chiral nanocavities arises from (i) the asymmetric coupling between interlayer cross-polarized resonant modes and (ii) a coherent interference between doubly degenerate states. Based on this formalism, a critical coupling condition capable of achieving zero transmission for circularly polarized light is proposed.
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Affiliation(s)
- Zhaolong Cao
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
| | - Jianfa Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
| | - Huanjun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
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18
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Zhang W, Ai B, Gu P, Guan Y, Wang Z, Xiao Z, Zhang G. Plasmonic Chiral Metamaterials with Sub-10 nm Nanogaps. ACS NANO 2021; 15:17657-17667. [PMID: 34734713 DOI: 10.1021/acsnano.1c05437] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Sub-10 nm nanogaps are enantioselectively fabricated between two nanocrescents based on nanoskiving and show tailored circular dichroism (CD) activity. The mirror symmetry of the nanostructure is broken by subsequent deposition with different azimuthal angles. Strong plasmonic coupling is excited in the gaps and at the tips, leading to the CD activity. The dissymmetry g-factor of the chiral nanogaps with 5 nm gap-width is -0.055, which is 2.5 times stronger than that of the 10 nm gap-width. Moreover, the surface-enhanced Raman scattering (SERS) performance of l/d-cysteine absorbed on chiral nanogaps manifests as the emergence of enantiospecific Raman peaks and the appearance of distinct changes in SERS intensities, which affirms that chiral nanogaps can recognize specific cysteine enantiomers via standard Raman spectroscopy in the absence of circularly polarized light source and a chiral label molecule. The sub-10 nm chiral nanogaps with tailored chiroptical responses show great potential in a class of chiral applications, such as chiral sensing, polarization converters, label-free chiral recognition, and asymmetric catalysis.
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Affiliation(s)
- Wei Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Bin Ai
- School of Microelectronics and Communication Engineering, Chongqing Key Laboratory of Bio-perception & Intelligent Information Processing, Chongqing University, Chongqing 400044, P.R. China
| | - Panpan Gu
- School of chemical engineering and machinery, Eastern Liaoning University, Dandong 118003, P.R. China
| | - Yuduo Guan
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Zengyao Wang
- School of Pharmacy, Weifang Medical University, Weifang 261053, P.R. China
| | - Zifan Xiao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Gang Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China
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19
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Martin AT, Nichols SM, Murphy VL, Kahr B. Chiroptical anisotropy of crystals and molecules. Chem Commun (Camb) 2021; 57:8107-8120. [PMID: 34322691 DOI: 10.1039/d1cc00991e] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Optical activity, a foundational part of chemistry, is not restricted to chiral molecules although generations have been instructed otherwise. A more inclusive view of optical activity is valuable because it clarifies structure-property relationships however, this view only comes into focus in measurements of oriented molecules, commonly found in crystals. Unfortunately, measurements of optical rotatory dispersion or circular dichroism in anisotropic single crystals have challenged scientists for more than two centuries. New polarimetric methods for unpacking the optical activity of crystals in general directions are still needed. Such methods are reviewed as well as some of the 'nourishment' they provide, thereby inviting to new researchers. Methods for fitting intensity measurements in terms of the constitutive tensor that manifests as the differential refraction and absorption of circularly polarized light, are described, and examples are illustrated. Single oriented molecules, as opposed to single oriented crystals, can be treated computationally. Structure-property correlations for such achiral molecules with comparatively simple electronic structures are considered as a heuristic foundation for the response of crystals that may be subject to measurement.
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Affiliation(s)
- Alexander T Martin
- Department of Chemistry and Molecular Design Institute, New York University, New York City, NY 10003, USA.
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20
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Rothe M, Zhao Y, Müller J, Kewes G, Koch CT, Lu Y, Benson O. Self-Assembly of Plasmonic Nanoantenna-Waveguide Structures for Subdiffractional Chiral Sensing. ACS NANO 2021; 15:351-361. [PMID: 33233888 DOI: 10.1021/acsnano.0c05240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Spin-momentum locking is a peculiar effect in the near-field of guided optical or plasmonic modes. It can be utilized to map the spinning or handedness of electromagnetic fields onto the propagation direction. This motivates a method to probe the circular dichroism of an illuminated chiral object. In this work, we demonstrate local, subdiffraction limited chiral coupling of light and propagating surface plasmon polaritons in a self-assembled system of a gold nanoantenna and a silver nanowire. A thin silica shell around the nanowire provides precise distance control and also serves as a host for fluorescent molecules, which indicate the direction of plasmon propagation. We characterize our nanoantenna-nanowire systems comprehensively through correlated electron microscopy, energy-dispersive X-ray spectroscopy, dark-field, and fluorescence imaging. Three-dimensional numerical simulations support the experimental findings. Besides our measurement of far-field polarization, we estimate sensing capabilities and derive not only a sensitivity of 1 mdeg for the ellipticity of the light field, but also find 103 deg cm2/dmol for the circular dichroism of an analyte locally introduced in the hot spot of the antenna-wire system. Thorough modeling of a prototypical design predicts on-chip sensing of chiral analytes. This introduces our system as an ultracompact sensor for chiral response far below the diffraction limit.
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Affiliation(s)
- Martin Rothe
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Yuhang Zhao
- Institute of Soft Matter and Functional Materials, Helmholtz Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Johannes Müller
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Günter Kewes
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Christoph T Koch
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Yan Lu
- Institute of Soft Matter and Functional Materials, Helmholtz Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
- Institute of Chemistry, University of Potsdam, 14476 Potsdam, Germany
| | - Oliver Benson
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
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21
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Circular Intensity Differential Scattering for Label-Free Chromatin Characterization: A Review for Optical Microscopy. Polymers (Basel) 2020; 12:polym12102428. [PMID: 33096877 PMCID: PMC7588990 DOI: 10.3390/polym12102428] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/09/2020] [Accepted: 10/16/2020] [Indexed: 02/08/2023] Open
Abstract
Circular Intensity Differential Scattering (CIDS) provides a differential measurement of the circular right and left polarized light and has been proven to be a gold standard label-free technique to study the molecular conformation of complex biopolymers, such as chromatin. In early works, it has been shown that the scattering component of the CIDS signal gives information from the long-range chiral organization on a scale down to 1/10th-1/20th of the excitation wavelength, leading to information related to the structure and orientation of biopolymers in situ at the nanoscale. In this paper, we review the typical methods and technologies employed for measuring this signal coming from complex macro-molecules ordering. Additionally, we include a general description of the experimental architectures employed for spectroscopic CIDS measurements, angular or spectral, and of the most recent advances in the field of optical imaging microscopy, allowing a visualization of the chromatin organization in situ.
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22
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Chiroptical spectroscopy of a freely diffusing single nanoparticle. Nat Commun 2020; 11:4513. [PMID: 32908138 PMCID: PMC7481242 DOI: 10.1038/s41467-020-18166-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 08/05/2020] [Indexed: 11/09/2022] Open
Abstract
Chiral plasmonic nanoparticles can exhibit strong chiroptical signals compared to the corresponding molecular response. Observations are, however, generally restricted to measurements on stationary single particles with a fixed orientation, which complicates the spectral analysis. Here, we report the spectroscopic observation of a freely diffusing single chiral nanoparticle in solution. By acquiring time-resolved circular differential scattering signals we show that the spectral interpretation is significantly simplified. We experimentally demonstrate the equivalence between time-averaged chiral spectra observed for an individual nanostructure and the corresponding ensemble spectra, and thereby demonstrate the ergodic principle for chiroptical spectroscopy. We also show how it is possible for an achiral particle to yield an instantaneous chiroptical response, whereas the time-averaged signals are an unequivocal measure of chirality. Time-resolved chiroptical spectroscopy on a freely moving chiral nanoparticle advances the field of single-particle spectroscopy, and is a means to obtain the true signature of the nanoparticle's chirality.
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23
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Ohnoutek L, Cho NH, Allen Murphy AW, Kim H, Răsădean DM, Pantoş GD, Nam KT, Valev VK. Single Nanoparticle Chiroptics in a Liquid: Optical Activity in Hyper-Rayleigh Scattering from Au Helicoids. NANO LETTERS 2020. [PMID: 32579377 DOI: 10.15125/bath-00862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Linear optical methods of determining the chirality of organic and inorganic materials have relied on weak chiral optical (chiroptical) effects. Nonlinear chiroptical characterization holds the potential of much greater sensitivity and smaller interaction volumes. However, suitable materials on which to perform measurements have been lacking for decades. Here, we present the first nonlinear chiroptical characterization of crystallographic chirality in gold helicoids (≈150 nm size) and core/shell helicoids with the newly discovered hyper-Rayleigh scattering optical activity (HRS OA) technique. The observed chiroptical signal is, on average, originating from between ≈0.05 and ≈0.13 helicoids, i.e., less than a single nanoparticle. The measured HRS OA ellipticities reach ≈3°, for a concentration ≈109 times smaller than that of chiral molecules with similar nonlinear chiroptical response. These huge values indicate that the helicoids are excellent candidates for future nonlinear chiroptical materials and applications.
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Affiliation(s)
- Lukas Ohnoutek
- Centre for Photonics and Photonic Materials, University of Bath, Bath BA2 7AY, U.K
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath BA2 7AY, U.K
| | - Nam Heon Cho
- Material Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Alexander William Allen Murphy
- Centre for Photonics and Photonic Materials, University of Bath, Bath BA2 7AY, U.K
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath BA2 7AY, U.K
| | - Hyeohn Kim
- Material Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | | | | | - Ki Tae Nam
- Material Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Ventsislav Kolev Valev
- Centre for Photonics and Photonic Materials, University of Bath, Bath BA2 7AY, U.K
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath BA2 7AY, U.K
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24
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Ohnoutek L, Cho NH, Allen Murphy AW, Kim H, Răsădean DM, Pantoş GD, Nam KT, Valev VK. Single Nanoparticle Chiroptics in a Liquid: Optical Activity in Hyper-Rayleigh Scattering from Au Helicoids. NANO LETTERS 2020; 20:5792-5798. [PMID: 32579377 PMCID: PMC7467767 DOI: 10.1021/acs.nanolett.0c01659] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/24/2020] [Indexed: 06/01/2023]
Abstract
Linear optical methods of determining the chirality of organic and inorganic materials have relied on weak chiral optical (chiroptical) effects. Nonlinear chiroptical characterization holds the potential of much greater sensitivity and smaller interaction volumes. However, suitable materials on which to perform measurements have been lacking for decades. Here, we present the first nonlinear chiroptical characterization of crystallographic chirality in gold helicoids (≈150 nm size) and core/shell helicoids with the newly discovered hyper-Rayleigh scattering optical activity (HRS OA) technique. The observed chiroptical signal is, on average, originating from between ≈0.05 and ≈0.13 helicoids, i.e., less than a single nanoparticle. The measured HRS OA ellipticities reach ≈3°, for a concentration ≈109 times smaller than that of chiral molecules with similar nonlinear chiroptical response. These huge values indicate that the helicoids are excellent candidates for future nonlinear chiroptical materials and applications.
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Affiliation(s)
- Lukas Ohnoutek
- Centre
for Photonics and Photonic Materials, University
of Bath, Bath BA2 7AY, U.K.
- Centre
for Nanoscience and Nanotechnology, University
of Bath, Bath BA2 7AY, U.K.
| | - Nam Heon Cho
- Material
Science and Engineering, Seoul National
University, 1 Gwanak-ro,
Gwanak-gu, Seoul 08826, Republic of Korea
| | - Alexander William Allen Murphy
- Centre
for Photonics and Photonic Materials, University
of Bath, Bath BA2 7AY, U.K.
- Centre
for Nanoscience and Nanotechnology, University
of Bath, Bath BA2 7AY, U.K.
| | - Hyeohn Kim
- Material
Science and Engineering, Seoul National
University, 1 Gwanak-ro,
Gwanak-gu, Seoul 08826, Republic of Korea
| | | | | | - Ki Tae Nam
- Material
Science and Engineering, Seoul National
University, 1 Gwanak-ro,
Gwanak-gu, Seoul 08826, Republic of Korea
| | - Ventsislav Kolev Valev
- Centre
for Photonics and Photonic Materials, University
of Bath, Bath BA2 7AY, U.K.
- Centre
for Nanoscience and Nanotechnology, University
of Bath, Bath BA2 7AY, U.K.
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25
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Spaeth P, Adhikari S, Le L, Jollans T, Pud S, Albrecht W, Bauer T, Caldarola M, Kuipers L, Orrit M. Circular Dichroism Measurement of Single Metal Nanoparticles Using Photothermal Imaging. NANO LETTERS 2019; 19:8934-8940. [PMID: 31790264 PMCID: PMC6909236 DOI: 10.1021/acs.nanolett.9b03853] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/05/2019] [Indexed: 05/22/2023]
Abstract
Circular dichroism (CD) spectroscopy is a powerful optical technique for the study of chiral materials and molecules. It gives access to an enantioselective signal based on the differential absorption of right and left circularly polarized light, usually obtained through polarization analysis of the light transmitted through a sample of interest. CD is routinely used to determine the secondary structure of proteins and their conformational state. However, CD signals are weak, limiting the use of this powerful technique to ensembles of many molecules. Here, we experimentally realize the concept of photothermal circular dichroism, a technique that combines the enantioselective signal from circular dichroism with the high sensitivity of photothermal microscopy, achieving a superior signal-to-noise ratio to detect chiral nano-objects. As a proof of principle, we studied the chiral response of single plasmonic nanostructures with CD in the visible range, demonstrating a signal-to-noise ratio better than 40 with only 30 ms integration time for these nanostructures. The high signal-to-noise ratio allows us to quantify the CD signal for individual nanoparticles. We show that we can distinguish relative absorption differences for right circularly and left circularly polarized light as small as gmin = 4 × 10-3 for a 30 ms integration time with our current experimental settings. The enhanced sensitivity of our technique extends CD studies to individual nano-objects and opens CD spectroscopy to numbers of molecules much lower than those in conventional experiments.
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Affiliation(s)
- Patrick Spaeth
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - Subhasis Adhikari
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - Laurent Le
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - Thomas Jollans
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - Sergii Pud
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - Wiebke Albrecht
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Thomas Bauer
- Department
of Quantum Nanoscience, Delft University
of Technology, Kavli Institute of Nanoscience Delft, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Martín Caldarola
- Department
of Quantum Nanoscience, Delft University
of Technology, Kavli Institute of Nanoscience Delft, Lorentzweg 1, 2628 CJ Delft, The Netherlands
- Department
of Bionanoscience, Delft University of Technology,
Kavli Institute of Nanoscience Delft, Lorentzweg 1, 2628 CJ Delft, The Netherlands
- E-mail:
| | - L. Kuipers
- Department
of Quantum Nanoscience, Delft University
of Technology, Kavli Institute of Nanoscience Delft, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Michel Orrit
- Huygens−Kamerlingh
Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
- E-mail:
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26
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Zhou J, Wang Y, Lu M, Ding J, Zhou L. Giant enhancement of tunable asymmetric transmission for circularly polarized waves in a double-layer graphene chiral metasurface. RSC Adv 2019; 9:33775-33780. [PMID: 35528893 PMCID: PMC9073710 DOI: 10.1039/c9ra05760a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 10/15/2019] [Indexed: 11/25/2022] Open
Abstract
In this letter, we propose a structure based on double-layer graphene-based planar chiral metasurface with a J-shaped pattern to generate asymmetric transmission for circularly polarized waves in the mid-infrared region. Asymmetric transmission of the double-layer structure can reach to 16.64%, which is much larger than that of the monolayer. The mechanism of asymmetric transmission is attributed to enantiomerically sensitive graphene's surface plasmons. Besides, asymmetric transmission can be dynamically tuned by changing the Fermi energy and is affected by intrinsic relaxation time. All simulations are conducted by the finite element method. Our findings provide a feasibility of realizing photonic devices in tunable polarization-dependent operation, such as asymmetric wave splitters and circulators.
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Affiliation(s)
- Jiaxin Zhou
- Optical Information Science and Technology Department, Jiangnan University Wuxi Jiangsu 214122 China
- Optoelectronic Engineering and Technology Research Center, Jiangnan University Wuxi Jiangsu 214122 China
| | - Yueke Wang
- Optical Information Science and Technology Department, Jiangnan University Wuxi Jiangsu 214122 China
- Optoelectronic Engineering and Technology Research Center, Jiangnan University Wuxi Jiangsu 214122 China
| | - Mengjia Lu
- Optical Information Science and Technology Department, Jiangnan University Wuxi Jiangsu 214122 China
- Optoelectronic Engineering and Technology Research Center, Jiangnan University Wuxi Jiangsu 214122 China
| | - Jian Ding
- Optical Information Science and Technology Department, Jiangnan University Wuxi Jiangsu 214122 China
- Optoelectronic Engineering and Technology Research Center, Jiangnan University Wuxi Jiangsu 214122 China
| | - Lei Zhou
- Optical Information Science and Technology Department, Jiangnan University Wuxi Jiangsu 214122 China
- Optoelectronic Engineering and Technology Research Center, Jiangnan University Wuxi Jiangsu 214122 China
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27
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de Dios C, Jiménez A, García F, García-Martín A, Cebollada A, Armelles G. Mueller matrix study of the dichroism in nanorods dimers: rod separation effects. OPTICS EXPRESS 2019; 27:21142-21152. [PMID: 31510196 DOI: 10.1364/oe.27.021142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 06/21/2019] [Indexed: 06/10/2023]
Abstract
We have studied the optical response of chiral metastructures composed of a disordered array of couples of plasmonic Au nanorods helically piled along the vertical direction. The fabrication is based on the use of multiaxial and multimaterial evaporation of the different metastructure building blocks through nanohole masks. From the analysis of the Mueller Matrix elements of the system, obtained both experimentally and from dedicated numerical simulations in forward and backward illumination conditions, we have been able to determine the linear and circular dichroic response of the system, as well as to sort out the optical anisotropy and intrinsic circular dichroism contributions to the circular differential extinction. We have also analyzed the dependence of the optical properties as a function of the angle between the rods and of the thickness of the dielectric separator. The study of quasi-planar as well as three-dimensional structures allows unraveling the role played by interactions between the constituting building blocks and, in particular, the distance between rods. We have experimentally and theoretically observed a decrease of the circular dichroic contribution and a change of the optical anisotropic contribution when the structures evolve from non-planar to planar.
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28
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Wilson JC, Gutsche P, Herrmann S, Burger S, McPeak KM. Correlation of circular differential optical absorption with geometric chirality in plasmonic meta-atoms. OPTICS EXPRESS 2019; 27:5097-5115. [PMID: 30876113 DOI: 10.1364/oe.27.005097] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 12/26/2018] [Indexed: 06/09/2023]
Abstract
We report a strong correlation between the calculated broadband circular differential optical absorption (CDOA) and the geometric chirality of plasmonic meta-atoms with two-dimensional chirality. We investigate this correlation using three common gold meta-atom geometries: L-shapes, triangles, and nanorod dimers, over a broad range of geometric parameters. We show that this correlation holds for both contiguous plasmonic meta-atoms and non-contiguous structures which support plasmonic coupling effects. A potential application for this correlation is the rapid optimization of plasmonic nanostructure for maximum broadband CDOA.
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29
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Hazra B, Dey J, Chandra M. Structure-specific chiroptical responses of hollow gold nanoprisms. Phys Chem Chem Phys 2018; 20:27675-27683. [PMID: 30375600 DOI: 10.1039/c8cp05298k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chiroptical responses of plasmonic chiral nanostructures can be controllably tuned by judicious tailoring of their structural parameters. In this article, the chiroptical properties of a newly designed plasmon-supporting nanostructure, chiral hollow gold nanoprisms (HGNs), has been numerically investigated in detail. The most compelling observation is that the CD response and the dissymmetry factor (g, which is a measure of the strength of chiroptical responses) of the chiral HGNs are large and at the same time, highly structure-specific. Also, we observed finite CD activity not only in absorption and scattering but also in the extinction spectra, which is a signature of a typical 3D chiral structure. We show that the chiroptical responses of HGNs can be exponentially enhanced simply by controlling the cavity-position or cavity size. Our results reveal that the structure-specific chiroptical response is a result of structure-dependent interplay between the non-radiative (Ohmic) and radiative losses. We also show that the CD intensity of a suitably designed chiral HGN is higher than other nanoscale metasurfaces of comparable volume. The insights obtained from this comprehensive study assert that this unique chiral nanostructure has great potential for being used in numerous applications.
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Affiliation(s)
- Bidhan Hazra
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.
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30
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Kahr B, Martin AT, Ernst K. On the chiroptical properties of racemic crystals. Chirality 2018; 30:378-382. [DOI: 10.1002/chir.22820] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 12/27/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Bart Kahr
- Department of Chemistry and Molecular Design Institute New York University New York NY USA
| | - Alexander T. Martin
- Department of Chemistry and Molecular Design Institute New York University New York NY USA
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31
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Mazaheri L, Lebel O, Nunzi JM. Transfer of chirality from light to a Disperse Red 1 molecular glass surface. OPTICS LETTERS 2017; 42:4845-4848. [PMID: 29216125 DOI: 10.1364/ol.42.004845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 10/05/2017] [Indexed: 06/07/2023]
Abstract
Chiral structures and materials interact with light in well-documented ways, but light can also interact with achiral materials to generate chirality by inscribing its asymmetric configuration on photoresponsive materials, such as azobenzene derivatives. While it is thus possible to generate both two-dimensional (2D) and three-dimensional (3D) chirality, 2D chirality is especially attractive because of its non-reciprocity. Herein, 2D chirality is induced on the surface of a glass-forming Disperse Red 1 derivative by irradiation with a single laser beam, yielding crossed spontaneous surface relief gratings with different pitches. Azimuth rotations up to 10° have been observed, and the absence of 3D chirality has been confirmed. This method thus allows generating non-reciprocal planar chiral objects by a simple, single irradiation process on a thin film of a material that can easily be processed over large areas or onto small objects.
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32
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Smith KW, Link S, Chang WS. Optical characterization of chiral plasmonic nanostructures. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2017. [DOI: 10.1016/j.jphotochemrev.2017.05.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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34
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Circular Dichroism Microscopy Free from Commingling Linear Dichroism via Discretely Modulated Circular Polarization. Sci Rep 2016; 6:35731. [PMID: 27761022 PMCID: PMC5071757 DOI: 10.1038/srep35731] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/04/2016] [Indexed: 11/08/2022] Open
Abstract
In this work, we developed a circular dichroism (CD) imaging microscope with a device to suppress the commingling of linear birefringence (LB) and linear dichroism (LD) signals. CD signals are, in principle, free from the commingling influence of LD and LB if the sample is illuminated with pure circularly polarized light, with no linear polarization contribution. Based on this idea, we here propose a novel circular polarization modulation method to suppress the contribution of linear polarization, which enables high-sensitivity CD detection (10-4 level in optical density unit or mdeg level in ellipticity) for microscopic imaging at a nearly diffraction limited spatial resolution (sub-μm level). The highly sensitive, diffraction-limited local CD detection will make direct analyses of chiral structures and spatial mappings of optical activity feasible for μm- to sub-μm-sized materials and may yield a number of applications as a unique optical imaging method.
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