1
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Wang R, Zhang Z. Unidirectional hyperbolic whispering-gallery phonon-polariton excitation in boron nitride nanotubes. OPTICS LETTERS 2024; 49:4082-4085. [PMID: 39090863 DOI: 10.1364/ol.528798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 07/01/2024] [Indexed: 08/04/2024]
Abstract
In two-dimensional (2D) hyperbolic materials, energy is directed into their deep subwavelength polaritonic modes through four narrow beams. Hyperbolic whispering-gallery mode nanocavity-confined phonon polaritons (PhPs) display a strongly enhanced light-matter interaction in the infrared regime. Particularly, the unidirectional phonon-polarization excitation in nanocavities has a potential application value in an on-chip integrated optical circuit design, efficient optical sensors, and enhanced spectral technology. Here, we explore the hyperbolic whispering-gallery mode PhPs on the cross section of a hexagonal BN nanotube (BNNT) and demonstrate that efficient unidirectional excitation can be achieved using a circularly polarized electric dipole, combining with optical spin-orbit coupling. Our results demonstrated that the undirectionality of the hyperbolic polariton propagation in a nanocavity can be conveniently achieved, independent of the structure symmetry of the nanocavity, providing potential applications in nanoscale light propagation, on-chip optical devices, and communication.
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2
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Renzi EM, Galiffi E, Ni X, Alù A. Hyperbolic Shear Metasurfaces. PHYSICAL REVIEW LETTERS 2024; 132:263803. [PMID: 38996284 DOI: 10.1103/physrevlett.132.263803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 05/22/2024] [Indexed: 07/14/2024]
Abstract
Polar dielectrics with low crystal symmetry and sharp phonon resonances can support hyperbolic shear polaritons, which are highly confined surface modes with frequency-dependent optical axes and asymmetric dissipation features. So far, these modes have been observed only in bulk natural materials at midinfrared frequencies, with properties limited by available crystal geometries and phonon resonance strength. Here, we introduce hyperbolic shear metasurfaces, which are ultrathin engineered surfaces supporting hyperbolic surface modes with symmetry-tailored axial dispersion and loss redistribution that can maximally enhance light-matter interactions. By engineering effective shear phenomena in these engineered surfaces, we demonstrate geometry-controlled, ultraconfined, low-loss hyperbolic surface waves with broadband Purcell enhancements applicable across a broad range of the electromagnetic spectrum.
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Affiliation(s)
- Enrico M Renzi
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA
- Physics Program, The Graduate Center, City University of New York, New York, New York 10026, USA
| | | | | | - Andrea Alù
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA
- Physics Program, The Graduate Center, City University of New York, New York, New York 10026, USA
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3
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Sun X, Wang F, Sun X, Wang X, Cao Y, Ding X, Dou Y, Fang R, Wang C, Liu H, Lu X, Gao H, Huang C. Directional surface plasmon polariton scattering using single magnetic nanoparticles. OPTICS LETTERS 2024; 49:3408-3411. [PMID: 38875632 DOI: 10.1364/ol.523793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 05/21/2024] [Indexed: 06/16/2024]
Abstract
Directional surface plasmon polaritons (SPPs) are expected to promote the energy efficiency of plasmonic devices, via limiting the energy in a given spatial domain. The directional scattering of dielectric nanoparticles induced by the interference between electric and magnetic responses presents a potential candidate for directional SPPs. Magnetic nanoparticles can introduce permeability as an extra manipulation, whose directional scattered SPPs have not been investigated yet. In this work, we demonstrated the directional scattered SPPs by using single magnetic nanoparticles via simulation and experiment. By increasing the permeability and particle size, the high-order TEM modes are excited inside the particle and induce more forward directional SPPs. It indicated that the particle size manifests larger tuning range compared with the permeability. Experimentally, the maximum forward-to-backward (F-to-B) SPP scattering intensity ratio of 118.52:1 is visualized by using a single 1 μm Fe3O4 magnetic nanoparticle. The directional scattered SPPs of magnetic nanoparticles are hopeful to improve the efficiency of plasmonic devices and pave the way for plasmonic circuits on-chip.
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4
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Ding W, Wang Z. Spatial-temporal optical vortex pendulum on a curved surface. OPTICS LETTERS 2024; 49:2445-2448. [PMID: 38691740 DOI: 10.1364/ol.523573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 04/08/2024] [Indexed: 05/03/2024]
Abstract
Spatial-temporal optical vortices (STOVs) have recently become the focus of newly structured optical fields. In this paper, their propagation on a 2D curved surface named the constant Gaussian curvature surface (CGCS) is studied. Using the matrix optics approach, we provide the analytical solution of the STOV propagation under the paraxial approximation on the CGCS with positive curvature. One method of creating timers is made possible by the spatiotemporal distribution direction of STOV light intensity, which swings like a pendulum throughout the evolution, in contrast to propagation on a flat surface. This swing, however, stops when the curved surface's curvature radius matches the light's Rayleigh distance. Besides, the transverse orbital angular momentum of STOV is deduced, and we find that the intrinsic and extrinsic OAM periodically exchange, but the total transverse OAM is always zero during the propagation on CGCS. It aids in controlling the transverse extrinsic orbital angular momentum of STOV in nontrivial space.
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5
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Wu H, Wang T, Hu Y. Chiral nanoparticle separation and discrimination using radially polarized circular Airy vortex beams with orbital-induced spin angular momentum. Phys Chem Chem Phys 2024; 26:8775-8783. [PMID: 38420742 DOI: 10.1039/d3cp04473d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
We report orbit-induced localized spin angular momentum associated with optical spin-orbit interactions in tightly focused radially polarized circular Airy vortex beams and demonstrate their potential for separation and discrimination of chiral nanoparticles. We find that variations in spin angular momentum density endow these beams with positive and negative annular optical chirality density. Utilizing these extraordinary distributions, particles having different chirality parameters can be separated and discriminated by using two degrees of freedom, i.e., radial trapping position and azimuthal rotation. We also discuss the impacts of longitudinal optical force and topological charge on manipulating chiral particles. Additionally, we conduct a comparative analysis of the optical trapping of a non-chiral particle. Our work is expected to deepen the understanding of spin-orbit interactions and provide valuable insight into vortex beam interactions with chiral particles.
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Affiliation(s)
- Hao Wu
- Department of Physics, Sichuan Normal University, Chengdu 610068, P.R. China.
| | - Tao Wang
- Department of Physics, Sichuan Normal University, Chengdu 610068, P.R. China.
| | - Yi Hu
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, P.R. China.
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6
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He C, Tang Z, Liu L, Maier SA, Wang X, Ren H, Pan A. Nonlinear Boost of Optical Angular Momentum Selectivity by Hybrid Nanolaser Circuits. NANO LETTERS 2024; 24:1784-1791. [PMID: 38265953 DOI: 10.1021/acs.nanolett.3c04830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
Selective control of light is essential for optical science and technology, with numerous applications. However, optical selectivity in the angular momentum of light has been quite limited, remaining constant by increasing the incident light power on previous passive optical devices. Here, we demonstrate a nonlinear boost of optical selectivity in both the spin and orbital angular momentum of light through near-field selective excitation of single-mode nanolasers. Our designed hybrid nanolaser circuits consist of plasmonic metasurfaces and individually placed perovskite nanowires, enabling subwavelength focusing of angular-momentum-distinctive plasmonic fields and further selective excitation of nanolasers in nanowires. The optically selected nanolaser with a nonlinear increase of light emission greatly enhances the baseline optical selectivity offered by the metasurface from about 0.4 up to near unity. Our demonstrated hybrid nanophotonic platform may find important applications in all-optical logic gates and nanowire networks, ultrafast optical switches, nanophotonic detectors, and on-chip optical and quantum information processing.
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Affiliation(s)
- Chenglin He
- Hunan Institute of Optoelectronic Integration and Key Laboratory for MicroNano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zilan Tang
- Hunan Institute of Optoelectronic Integration and Key Laboratory for MicroNano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Liang Liu
- Hunan Institute of Optoelectronic Integration and Key Laboratory for MicroNano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Stefan A Maier
- School of Physics and Astronomy, Faculty of Science, Monash University, Melbourne, Victoria 3800, Australia
- Department of Physics, Imperial College London, London SW7 2AZ, U.K
| | - Xiaoxia Wang
- Hunan Institute of Optoelectronic Integration and Key Laboratory for MicroNano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Haoran Ren
- School of Physics and Astronomy, Faculty of Science, Monash University, Melbourne, Victoria 3800, Australia
| | - Anlian Pan
- Hunan Institute of Optoelectronic Integration and Key Laboratory for MicroNano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, P. R. China
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7
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Medhat M, Mehaney A, Al-Dossari M, Aly AH, Elsayed HA. Characteristics of multi-absorption bands in near IR based on a 1D photonic crystal comprising two composite metamaterials. Sci Rep 2024; 14:1087. [PMID: 38212398 PMCID: PMC10784522 DOI: 10.1038/s41598-024-51229-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/02/2024] [Indexed: 01/13/2024] Open
Abstract
The Matlab program has been utilized in this study to examine the absorption spectral properties of a one-dimensional photonic crystal (1DPCs) comprising two composite metamaterials through near IR wavelengths. The composite metamaterials are designed from Ag of a gyroidal geometry (layer A) and hyperbolic metamaterial (layer B). Therefore, the introduced design is labeled as [Formula: see text] with n and m to define the periodicity of the hyperbolic metamaterial and the whole structure, respectively. The numerical findings have been introduced in the vicinity of the effective medium theory, transfer matrix method and the Drude model as well. In this regard, the numerical results demonstrate the appearance of some spectral absorption bands ranging from 0.7 µm to 3 µm for both TM and TE polarizations. Additionally, these bands are almost insensitive to the changes in the angle of incidence. Interestingly, we have considered the role played by some parameters such as the permittivities and thicknesses of both layers on the introduced absorption bands. Finally, we believe that the investigated results could be promising through many applications such as wavelength selective absorbers, solar energy, and smart windows as well.
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Affiliation(s)
- Mai Medhat
- TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62512, Egypt
| | - Ahmed Mehaney
- TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62512, Egypt
| | - M Al-Dossari
- Department of Physics, Faculty of Science, King Khalid University, Abha, 62529, Saudi Arabia
| | - Arafa H Aly
- TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62512, Egypt.
| | - Hussein A Elsayed
- TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62512, Egypt
- Department of Physics, College of Science, University of Ha'il, Ha'il, P.O. Box 2440, Saudi Arabia
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8
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Wang H, Kumar A, Dai S, Lin X, Jacob Z, Oh SH, Menon V, Narimanov E, Kim YD, Wang JP, Avouris P, Martin Moreno L, Caldwell J, Low T. Planar hyperbolic polaritons in 2D van der Waals materials. Nat Commun 2024; 15:69. [PMID: 38167681 PMCID: PMC10761702 DOI: 10.1038/s41467-023-43992-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 11/27/2023] [Indexed: 01/05/2024] Open
Abstract
Anisotropic planar polaritons - hybrid electromagnetic modes mediated by phonons, plasmons, or excitons - in biaxial two-dimensional (2D) van der Waals crystals have attracted significant attention due to their fundamental physics and potential nanophotonic applications. In this Perspective, we review the properties of planar hyperbolic polaritons and the variety of methods that can be used to experimentally tune them. We argue that such natural, planar hyperbolic media should be fairly common in biaxial and uniaxial 2D and 1D van der Waals crystals, and identify the untapped opportunities they could enable for functional (i.e. ferromagnetic, ferroelectric, and piezoelectric) polaritons. Lastly, we provide our perspectives on the technological applications of such planar hyperbolic polaritons.
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Affiliation(s)
- Hongwei Wang
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
- Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, 315211, Ningbo, China
| | - Anshuman Kumar
- Laboratory of Optics of Quantum Materials, Department of Physics, IIT Bombay, Mumbai, Maharashtra, 400076, India
| | - Siyuan Dai
- Department of Mechanical Engineering, Materials Research and Education Center, Auburn University, Auburn, AL, 36849, USA
| | - Xiao Lin
- Interdisciplinary Center for Quantum Information, State Key Laboratory of Extreme Photonics and Instrumentation, ZJU-Hangzhou Global Science and Technology Innovation Center, College of Information Science and Electronic Engineering, Zhejiang University, 310027, Hangzhou, China
| | - Zubin Jacob
- Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Sang-Hyun Oh
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Vinod Menon
- Department of Physics, City College and Graduate Center, City University of New York, New York, NY, 10031, USA
| | - Evgenii Narimanov
- Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Young Duck Kim
- Department of Physics and Department of Information Display, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Jian-Ping Wang
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Phaedon Avouris
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
- IBM T. J. Watson Research Center, Yorktown Heights, NY, 10598, USA
| | - Luis Martin Moreno
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
- Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, Zaragoza, 50009, Spain
| | - Joshua Caldwell
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, 37235, USA
| | - Tony Low
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, 55455, USA.
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9
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Nayak JK, Suchiang H, Ray SK, Guchhait S, Banerjee A, Gupta SD, Ghosh N. Spin-Direction-Spin Coupling of Quasiguided Modes in Plasmonic Crystals. PHYSICAL REVIEW LETTERS 2023; 131:193803. [PMID: 38000433 DOI: 10.1103/physrevlett.131.193803] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 09/25/2023] [Indexed: 11/26/2023]
Abstract
We report an unusual spin-direction-spin coupling phenomenon of light using the leaky quasiguided modes of a waveguided plasmonic crystal. This is demonstrated as simultaneous input spin-dependent directional guiding of waves (spin-direction coupling) and wave-vector-dependent spin acquisition (direction-spin coupling) of the scattered light. These effects, manifested as the forward and the inverse spin Hall effect of light in the far field, and other accompanying spin-orbit interaction effects are observed and analyzed using a momentum (k) domain polarization Mueller matrix. Resonance-enabled enhancement of these effects is also demonstrated by utilizing the spectral Fano resonance of the hybridized modes. The fundamental origin and the unconventional manifestation of the spin-direction-spin coupling phenomenon from a relatively simple system, ability to probe and interpret the resulting spin-orbit phenomena in the far field through momentum-domain polarization analysis, and their regulated control in plasmonic-photonic crystals open up exciting avenues in spin-orbit-photonic research.
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Affiliation(s)
- Jeeban Kumar Nayak
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
| | - Harley Suchiang
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
| | - Subir Kumar Ray
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
| | - Shyamal Guchhait
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
| | - Ayan Banerjee
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
| | - Subhasish Dutta Gupta
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
- Tata Centre for Interdisciplinary Sciences, TIFRH, Hyderabad 500107, India
| | - Nirmalya Ghosh
- Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, India, 741246
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10
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Yu H, Shen Z, Jiang K. Visualizing lateral optical force through surface plasmon-coupled emission. OPTICS LETTERS 2023; 48:5073-5076. [PMID: 37773388 DOI: 10.1364/ol.504479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 09/11/2023] [Indexed: 10/01/2023]
Abstract
In this Letter, we report the intrinsic relationship among surface plasmon polaritons, lateral optical force, and surface plasmon-coupled emission. The spin-orbit coupling in the near field through circularly polarized beams would lead to the unidirectional excitation of surface plasmon polaritons, where the symmetry state of the electromagnetic field on the surface is broken. This asymmetric scattering would generate the counter-intuitive lateral optical force due to momentum conservation. As the inverse process of surface plasmon polaritons, surface plasmon-coupled emission enables the guide of the near-field surface plasmon polariton signal to the far field. We found that the lateral optical force produced by the unidirectional excitation of surface plasmon polaritons can be observed in the surface plasmon-coupled emission patterns. The elliptical dipole model was used to demonstrate these coupling processes. The magnitude and direction of lateral optical force can be a dipole, respectively. Moreover, the intensity convergence degree and direction of the surface plasmon-coupled emission distribution can reflect the magnitude and direction of lateral optical force, respectively. This work has great potential in the applications of weak force measurement, dynamic optical sorting, and light-matter interaction research.
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11
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Yang C, Zhang D, Zhao J, Gao W, Yuan W, Long Y, Pan Y, Chen H, Nori F, Bliokh KY, Zhong Z, Ren J. Hybrid Spin and Anomalous Spin-Momentum Locking in Surface Elastic Waves. PHYSICAL REVIEW LETTERS 2023; 131:136102. [PMID: 37831989 DOI: 10.1103/physrevlett.131.136102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 08/28/2023] [Indexed: 10/15/2023]
Abstract
Transverse spin of surface waves is a universal phenomenon which has recently attracted significant attention in optics and acoustics. It appears in gravity water waves, surface plasmon polaritons, surface acoustic waves, and exhibits remarkable intrinsic spin-momentum locking, which has found useful applications for efficient spin-direction couplers. Here we demonstrate, both theoretically and experimentally, that the transverse spin of surface elastic (Rayleigh) waves has an anomalous sign near the surface, opposite to that in the case of electromagnetic, sound, or water surface waves. This anomalous sign appears due to the hybrid (neither transverse nor longitudinal) nature of elastic surface waves. Furthermore, we show that this sign anomaly can be employed for the selective spin-controlled excitation of symmetric and antisymmetric Lamb modes propagating in opposite directions in an elastic plate. Our results pave the way for spin-controlled manipulation of elastic waves and can be important for a variety of areas, from phononic spin-based devices to seismic waves.
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Affiliation(s)
- Chenwen Yang
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Danmei Zhang
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Jinfeng Zhao
- School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
| | - Wenting Gao
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Weitao Yuan
- School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Yang Long
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Yongdong Pan
- School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
| | - Hong Chen
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Franco Nori
- Theoretical Quantum Physics Laboratory, Cluster for Pioneering Research, RIKEN, Wako-shi, Saitama 351-0198, Japan
- Center for Quantum Computing, RIKEN, Wako-shi, Saitama 351-0198, Japan
- Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - Konstantin Y Bliokh
- Theoretical Quantum Physics Laboratory, Cluster for Pioneering Research, RIKEN, Wako-shi, Saitama 351-0198, Japan
- Centre of Excellence ENSEMBLE3 Sp. z o.o., 01-919 Warsaw, Poland
- Donostia International Physics Center (DIPC), Donostia-San Sebastián 20018, Spain
| | - Zheng Zhong
- School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
| | - Jie Ren
- Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
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12
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Feng F, Yuan X. A new member of the structured light family: optical spatiotemporal vortices. LIGHT, SCIENCE & APPLICATIONS 2023; 12:236. [PMID: 37714875 PMCID: PMC10504329 DOI: 10.1038/s41377-023-01281-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/17/2023]
Abstract
The burgeoning growth of structured light has opened up new possibilities for harnessing the spatiotemporal coupling effects in light. Optical spatiotemporal vortices, as a subset of spatiotemporal light, have emerged as a focal point of recent research, owing to their distinctive characteristics and vast range for application. This unique structured light will endow photons with a new degree of freedom, promising to revolutionize researchers' understanding of photonics. Conducting thorough research on optical spatiotemporal vortices will establish a solid foundation for the development of innovative physical mechanisms and advanced applications in photonics.
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Affiliation(s)
- Fu Feng
- Research Center for Humanoid Sensing, Zhejiang Lab, Hangzhou, 311100, China
| | - Xiaocong Yuan
- Research Center for Humanoid Sensing, Zhejiang Lab, Hangzhou, 311100, China.
- Nanophotonics Research Centre, Shenzhen University, Shenzhen, 518060, China.
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13
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Sutter P, Khosravi-Khorashad L, Ciobanu CV, Sutter E. Chirality and dislocation effects in single nanostructures probed by whispering gallery modes. MATERIALS HORIZONS 2023; 10:3830-3839. [PMID: 37424314 DOI: 10.1039/d3mh00693j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Nanostructures such as nanoribbons and -wires are of interest as components for building integrated photonic systems, especially if their basic functionality as dielectric waveguides can be extended by chiroptical phenomena or modifications of their optoelectronic properties by extended defects, such as dislocations. However, conventional optical measurements typically require monodisperse (and chiral) ensembles, and identifying emerging chiral optical activity or dislocation effects in single nanostructures has remained an unmet challenge. Here we show that whispering gallery modes can probe chirality and dislocation effects in single nanowires. Wires of the van der Waals semiconductor germanium(II) sulfide (GeS), obtained by vapor-liquid-solid growth, invariably form as growth spirals around a single screw dislocation that gives rise to a chiral structure and can modify the electronic properties. Cathodoluminescence spectroscopy on single tapered GeS nanowires containing joined dislocated and defect-free segments, augmented by numerical simulations and ab-initio calculations, identifies chiral whispering gallery modes as well as a pronounced modulation of the electronic structure attributed to the screw dislocation. Our results establish chiral light-matter interactions and dislocation-induced electronic modifications in single nanostructures, paving the way for their application in multifunctional photonic architectures.
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Affiliation(s)
- Peter Sutter
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | | | - Cristian V Ciobanu
- Department of Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USA
| | - Eli Sutter
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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14
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Zhang X, Yan Q, Ma W, Zhang T, Yang X, Zhang X, Li P. Ultrafast anisotropic dynamics of hyperbolic nanolight pulse propagation. SCIENCE ADVANCES 2023; 9:eadi4407. [PMID: 37624891 PMCID: PMC10456838 DOI: 10.1126/sciadv.adi4407] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 07/27/2023] [Indexed: 08/27/2023]
Abstract
Polariton pulses-transient light-matter hybrid excitations-traveling through anisotropic media can lead to unusual optical phenomena in space and time. However, studying these pulses presents challenges with their anisotropic, ultrafast, and nanoscale field variations. Here, we demonstrate the creation, observation, and control of polariton pulses, with in-plane hyperbolic dispersion, on anisotropic crystal surfaces by using a time-resolved nanoimaging technique and our developed high-dimensional data processing. We capture and analyze movies of distinctive pulse spatiotemporal dynamics, including curved ultraslow energy flow trajectories, anisotropic dissipation, and dynamical misalignment between phase and group velocities. Our approach enables analysis of polariton pulses in the wave vector time domain, demonstrating a time-domain polaritonic topological transition from lenticular to hyperbolic dispersion contours and the ability to study the polariton-induced time-varying optical forces. Our findings promise to facilitate the study of diverse space-time phenomena at extreme scales and drive advances in ultrafast nanoimaging.
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Affiliation(s)
- Xin Zhang
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
| | - Qizhi Yan
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
| | - Weiliang Ma
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
| | - Tianning Zhang
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
| | - Xiaosheng Yang
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
| | - Xinliang Zhang
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
- Xidian University, Xi’an 710126, China
| | - Peining Li
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
- Optics Valley Laboratory, Hubei 430074, China
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15
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Lv H, Bai Y, Zhang Q, Yang Y. Flatband polaritonic router in twisted bilayer van der Waals materials. OPTICS LETTERS 2023; 48:4073-4076. [PMID: 37527121 DOI: 10.1364/ol.496630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/05/2023] [Indexed: 08/03/2023]
Abstract
In recent years, van der Waals (vdW) polaritons excited by the hybrid of matter and photons have shown great promise for applications in nanoimaging, biosensing, and on-chip light guiding. In particular, polaritons with a flatband dispersion allow for mode canalization and diffractionless propagation, which showcase advantages for on-chip technologies requiring long-range transportation of optical information. Here, we propose a flatband polaritonic router based on twisted α-MoO3 bilayers, which allows for on-chip routing of highly confined and low-loss phonon polaritons (PhPs) along multichannel propagating paths under different circular polarized dipole excitations. Our work combines flatband physics and optical spin- orbit coupling, with potential applications in nanoscale light propagation, on-chip optical switching, and communication.
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16
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Ahmadi H, Khavasi A. Babinet-complementary structures for implementation of pseudospin-polarized waveguides. OPTICS EXPRESS 2023; 31:21626-21640. [PMID: 37381256 DOI: 10.1364/oe.485765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 05/29/2023] [Indexed: 06/30/2023]
Abstract
In this work, a theorem is proved stating that in various types of waveguides with mirror reflection symmetries, the electromagnetic duality correspondence between eigenmodes of complementary structures induces counterpropagating spin-polarized states. The mirror reflection symmetries may be preserved around one or more arbitrary planes. Pseudospin-polarized waveguides supporting one-way states manifest robustness. This is similar to topologically non-trivial direction-dependent states guided by photonic topological insulators. Nevertheless, a remarkable aspect of our structures is that they can be implemented in extremely broad bandwidth by simply using complementary structures. Based on our theory, the concept of the pseudospin polarized waveguide can be realized using dual impedance surfaces ranging from microwave to optical regime. Consequently, there is no need to employ bulk electromagnetic materials to suppress backscattering in waveguiding structures. This also includes pseudospin-polarized waveguides with perfect electric conductor-perfect magnetic conductor boundaries where the boundary conditions limit the bandwidth of waveguides. We design and develop various unidirectional systems and the spin-filtered feature in the microwave regime is further investigated.
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17
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Abstract
The topological properties of an object, associated with an integer called the topological invariant, are global features that cannot change continuously but only through abrupt variations, hence granting them intrinsic robustness. Engineered metamaterials (MMs) can be tailored to support highly nontrivial topological properties of their band structure, relative to their electronic, electromagnetic, acoustic and mechanical response, representing one of the major breakthroughs in physics over the past decade. Here, we review the foundations and the latest advances of topological photonic and phononic MMs, whose nontrivial wave interactions have become of great interest to a broad range of science disciplines, such as classical and quantum chemistry. We first introduce the basic concepts, including the notion of topological charge and geometric phase. We then discuss the topology of natural electronic materials, before reviewing their photonic/phononic topological MM analogues, including 2D topological MMs with and without time-reversal symmetry, Floquet topological insulators, 3D, higher-order, non-Hermitian and nonlinear topological MMs. We also discuss the topological aspects of scattering anomalies, chemical reactions and polaritons. This work aims at connecting the recent advances of topological concepts throughout a broad range of scientific areas and it highlights opportunities offered by topological MMs for the chemistry community and beyond.
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Affiliation(s)
- Xiang Ni
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
- School of Physics and Electronics, Central South University, Changsha, Hunan 410083, China
| | - Simon Yves
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
| | - Alex Krasnok
- Department of Electrical and Computer Engineering, Florida International University, Miami, Florida 33174, USA
| | - Andrea Alù
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
- Department of Electrical Engineering, City College, The City University of New York, 160 Convent Avenue, New York, New York 10031, United States
- Physics Program, The Graduate Center, The City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
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18
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Xu Y, Li L, Jeong H, Kim S, Kim I, Rho J, Liu Y. Subwavelength control of light transport at the exceptional point by non-Hermitian metagratings. SCIENCE ADVANCES 2023; 9:eadf3510. [PMID: 37172089 PMCID: PMC10181182 DOI: 10.1126/sciadv.adf3510] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The concept of non-Hermitian physics, originally developed in the context of quantum field theory, has been investigated on distinct photonic platforms and created a plethora of counterintuitive phenomena. Interfacing non-Hermitian photonics and nanoplasmonics, here, we demonstrate unidirectional excitation and reflection of surface plasmon polaritons by elaborately designing the permittivity profile of non-Hermitian metagratings, in which the eigenstates of the system can coalesce at an exceptional point. Continuous tuning of the excitation or reflection ratios is also possible through altering the geometry of the metagrating. The controllable directionality and robust performance are attributed to the phase transition near the exceptional point, which is fully confirmed by the theoretic calculation, numerical simulation, and experimental characterization. Our work pushes non-Hermitian photonics to the nanoscale regime and paves the way toward high-performance plasmonic devices with superior controllability, performance, and robustness by using the topological effect associated with non-Hermitian systems.
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Affiliation(s)
- Yihao Xu
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
| | - Lin Li
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
| | - Heonyeong Jeong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Seokwoo Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Inki Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- Department of Biophysics, Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Junsuk Rho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang 37673, Republic of Korea
- National Institute of Nanomaterials Technology (NINT), Pohang 37673, Republic of Korea
| | - Yongmin Liu
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
- Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, USA
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19
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Pan D, Xu H. Polarizing Free Electrons in Optical Near Fields. PHYSICAL REVIEW LETTERS 2023; 130:186901. [PMID: 37204889 DOI: 10.1103/physrevlett.130.186901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 03/03/2023] [Indexed: 05/21/2023]
Abstract
Polarizing electron beams using light is highly desirable but exceedingly challenging, as the approaches proposed in previous studies using free-space light usually require enormous laser intensities. Here, we propose the use of a transverse electric optical near field, extended on nanostructures, to efficiently polarize an adjacent electron beam by exploiting the strong inelastic electron scattering in phase-matched optical near fields. Intriguingly, the two spin components of an unpolarized incident electron beam-parallel and antiparallel to the electric field-are spin-flipped and inelastically scattered to different energy states, providing an analog of the Stern-Gerlach experiment in the energy dimension. Our calculations show that when a dramatically reduced laser intensity of ∼10^{12} W/cm^{2} and a short interaction length of 16 μm are used, an unpolarized incident electron beam interacting with the excited optical near field can produce two spin-polarized electron beams, both exhibiting near unity spin purity and a 6% brightness relative to the input beam. Our findings are important for optical control of free-electron spins, preparation of spin-polarized electron beams, and applications in material science and high-energy physics.
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Affiliation(s)
- Deng Pan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
- Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
| | - Hongxing Xu
- Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
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20
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Tang X, Kuai Y, Fan Z, Zhang Z, Zhang D. Retrieving the subwavelength cross-section of dielectric nanowires with asymmetric excitation of Bloch surface waves. Phys Chem Chem Phys 2023; 25:7711-7718. [PMID: 36876861 DOI: 10.1039/d3cp00206c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Optical microscopy with a diffraction limit cannot distinguish nanowires with sectional dimensions close to or smaller than the optical resolution. Here, we propose a scheme to retrieve the subwavelength cross-section of nanowires based on the asymmetric excitation of Bloch surface waves (BSWs). Leakage radiation microscopy is used to observe the propagation of BSWs at the surface and to collect far-field scattering patterns in the substrate. A model of linear dipoles induced by tilted incident light is built to explain the directional imbalance of BSWs. It shows the potential capability in precisely resolving the subwavelength cross-section of nanowires from far-field scattering without the need for complex algorithms. Through comparing the nanowire widths measured by this method and those measured by scanning electron microscopy (SEM), the transverse resolutions of the widths of two series of nanowires with heights 55 nm and 80 nm are about 4.38 nm and 6.83 nm. All results in this work demonstrate that the new non-resonant far-field optical technology has potential application in metrology measurements with high precision by taking care of the inverse process of light-matter interaction.
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Affiliation(s)
- Xi Tang
- Advanced Laser Technology Laboratory of Anhui Province, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Yan Kuai
- Advanced Laser Technology Laboratory of Anhui Province, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Zetao Fan
- Advanced Laser Technology Laboratory of Anhui Province, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Zhiyu Zhang
- Advanced Laser Technology Laboratory of Anhui Province, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Douguo Zhang
- Advanced Laser Technology Laboratory of Anhui Province, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
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21
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Luo K, Huang Z, Lv X, Qiu W, Guan H, Yang T, Grosjean T, Lu H. Directional Bloch surface wave coupling enabled by magnetic spin-momentum locking of light. NANOSCALE ADVANCES 2023; 5:1664-1671. [PMID: 36926573 PMCID: PMC10012835 DOI: 10.1039/d2na00899h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
We study the magnetic spin-locking of optical surface waves. Through an angular spectrum approach and numerical simulations, we predict that a spinning magnetic dipole develops a directional coupling of light to transverse electric (TE) polarized Bloch surface waves (BSWs). A high-index nanoparticle as a magnetic dipole and nano-coupler is placed on top of a one-dimensional photonic crystal to couple light into BSWs. Upon circularly polarized illumination, it mimics the spinning magnetic dipole. We find that the helicity of the light impinging on the nano-coupler controls the directionality of emerging BSWs. Furthermore, identical silicon strip waveguides are configured on the two sides of the nano-coupler to confine and guide the BSWs. We achieve a directional nano-routing of BSWs with circularly polarized illumination. Such a directional coupling phenomenon is proved to be solely mediated by the optical magnetic field. This offers opportunities for directional switching and polarization sorting by controlling optical flows in ultra-compact architectures and enables the investigation of the magnetic polarization properties of light.
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Affiliation(s)
- Kaiwen Luo
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
| | - Zhijing Huang
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
- School of Electronics and Communication, Guangdong Mechanical and Electrical Polytechnic Guangzhou 510550 China
| | - Xianpeng Lv
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
| | - Wentao Qiu
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
| | - Heyuan Guan
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
| | - Tiefeng Yang
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
- Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University Guangzhou 510632 China
| | - Thierry Grosjean
- CNRS, FEMTO-ST Institute UMR 6174, Université Bourgogne Franche-Comté Besançon 25000 France
| | - Huihui Lu
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University Guangzhou 510632 China
- Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University Guangzhou 510632 China
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22
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Shi Y, Zhu T, Liu J, Tsai DP, Zhang H, Wang S, Chan CT, Wu PC, Zayats AV, Nori F, Liu AQ. Stable optical lateral forces from inhomogeneities of the spin angular momentum. SCIENCE ADVANCES 2022; 8:eabn2291. [PMID: 36449614 PMCID: PMC9710880 DOI: 10.1126/sciadv.abn2291] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 10/17/2022] [Indexed: 05/29/2023]
Abstract
Transverse spin momentum related to the spin angular momentum (SAM) of light has been theoretically studied recently and predicted to generate an intriguing optical lateral force (OLF). Despite extensive studies, there is no direct experimental evidence of a stable OLF resulting from the dominant SAM rather than the ubiquitous spin-orbit interaction in a single light beam. Here, we theoretically unveil the nontrivial physics of SAM-correlated OLF, showing that the SAM is a dominant factor for the OLF on a nonabsorbing particle, while an additional force from the canonical (orbital) momentum is exhibited on an absorbing particle due to the spin-orbit interaction. Experimental results demonstrate the bidirectional movement of 5-μm-diameter particles on both sides of the beam with opposite spin momenta. The amplitude and sign of this force strongly depend on the polarization. Our optofluidic platform advances the exploitation of exotic forces in systems with a dominant SAM, facilitating the exploration of fascinating light-matter interactions.
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Affiliation(s)
- Yuzhi Shi
- Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
- MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai 200092, China
- Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China
- Shanghai Frontiers Science Center of Digital Optics, Shanghai 200092, China
| | - Tongtong Zhu
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
| | - Jingquan Liu
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Din Ping Tsai
- Department of Electrical Engineering, City University of Hong Kong, Hong Kong, China
| | - Hui Zhang
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Shubo Wang
- Department of Physics, City University of Hong Kong, Hong Kong, China
| | - Che Ting Chan
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Pin Chieh Wu
- Department of Photonics, National Cheng Kung University, Tainan 70101, Taiwan
| | - Anatoly V. Zayats
- Department of Physics and London Centre for Nanotechnology, King’s College London, London, UK
| | - Franco Nori
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wakoshi, Saitama 351-0198, Japan
- Physics Department, University of Michigan, Ann Arbor, MI 48109-1040, USA
| | - Ai Qun Liu
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
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23
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Ni J, Liu S, Chen Y, Hu G, Hu Y, Chen W, Li J, Chu J, Qiu CW, Wu D. Direct Observation of Spin-Orbit Interaction of Light via Chiroptical Responses. NANO LETTERS 2022; 22:9013-9019. [PMID: 36326581 DOI: 10.1021/acs.nanolett.2c03266] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The spin-orbit interaction of light is a fundamental manifestation of controlling its angular momenta with numerous applications in photonic spin Hall effects and chiral quantum optics. However, observation of an optical spin Hall effect, which is normally very weak with subwavelength displacements, needs quantum weak measurements or sophisticated metasurfaces. Here, we theoretically and experimentally demonstrate the spin-orbit interaction of light in the form of strong chiroptical responses by breaking the in-plane inversion symmetry of a dielectric substrate. The chiroptical signal is observed at the boundary of a microdisk illuminated by circularly polarized vortex beams at normal incidence. The generated chiroptical spectra are tunable for different photonic orbital angular momenta and microdisk diameters. Our findings, correlating photonic spin-orbit interaction with chiroptical responses, may provide a route for exploiting optical information processing, enantioselective sensing, and chiral metrology.
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Affiliation(s)
- Jincheng Ni
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore117583, Singapore
| | - Shunli Liu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
| | - Yang Chen
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
| | - Guangwei Hu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore117583, Singapore
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
| | - Weijin Chen
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore117583, Singapore
| | - Jiawen Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
| | - Jiaru Chu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
| | - Cheng-Wei Qiu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore117583, Singapore
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui230027, People's Republic of China
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24
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Bliokh KY. Elastic Spin and Orbital Angular Momenta. PHYSICAL REVIEW LETTERS 2022; 129:204303. [PMID: 36462016 DOI: 10.1103/physrevlett.129.204303] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 10/20/2022] [Indexed: 06/17/2023]
Abstract
Motivated by recent theoretical and experimental interest in the spin and orbital angular momenta of elastic waves, we revisit canonical wave momentum, spin, and orbital angular momentum in isotropic elastic media. We show that these quantities are described by simple universal expressions, which differ from the results of Chaplain et al. [Phys. Rev. Lett. 128, 064301 (2022)PRLTAO0031-900710.1103/PhysRevLett.128.064301] and do not require separation of the longitudinal and transverse parts of the wave field. For cylindrical elastic modes, the normalized z component of the total (spin+orbital) angular momentum is quantized and equals the azimuthal quantum number of the mode, while the orbital and spin parts are not quantized due to the spin-orbit geometric-phase effects. In contrast to the claims of the above article, longitudinal, transverse, and "hybrid" contributions to the angular momenta are equally important in general and cannot be neglected. As another example, we calculate the transverse spin angular momentum of a surface Rayleigh wave.
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Affiliation(s)
- Konstantin Y Bliokh
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan
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25
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Zhang C, Cheng Y, Wang S. Light funneling by spin-orbit-coupled chiral particles on an arbitrary order exceptional surface. OPTICS EXPRESS 2022; 30:42495-42503. [PMID: 36366702 DOI: 10.1364/oe.472285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Optical systems at non-Hermitian exceptional points (EPs) have intriguing properties that promise novel applications in light manipulations. Here, we realize an arbitrary order exceptional surface (ES), i.e., a surface of arbitrary order EPs, in chiral particles that couple with each other via the photonic spin-orbit interaction mediated by a dielectric waveguide. The chirality of the particles enables selective excitation of the chiral dipole modes by linearly polarized light. The unidirectional coupling of the chiral dipole modes gives rise to the ES in the parameter space defined by the material loss and coupling distance of the particles. We apply the system to realize a light funnel that can convert free-space plane waves to guided waves and funnel the incident light energy into a ring resonator. The results can find applications in designing optical switches, on-chip conversion of guided waves, and harvest of light energy.
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26
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Switchable unidirectional waves on mono- and diatomic metamaterials. Sci Rep 2022; 12:16845. [PMID: 36207465 PMCID: PMC9546884 DOI: 10.1038/s41598-022-20972-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/21/2022] [Indexed: 11/25/2022] Open
Abstract
We demonstrate switchable unidirectional propagation of slow waves of coupling within a metamaterial array of strongly coupled elements. We predict theoretically and verify experimentally that the direction of propagation of magnetoinductive waves for any chosen excitation pattern is dictated by the dispersion relations, with forward and backward waves propagating in opposite directions along a chain of meta-atoms. We further prove that the same fundamental phenomenon of direction selectivity due to the forward/backward wave nature is not limited to magnetoinductive waves: we predict analytically and verify numerically the same selective unidirectional signal propagation occurring in nanostructured metamaterial arrays with purely electric coupling. Generalising our method of unidirectional waveguiding to a diatomic magnetoinductive array featuring both forward-wave and backward-wave dispersion branches, switchable unidirectional signal propagation is achieved with distinct frequency bands with opposite directions of signal propagation. Finally, by expanding our technique of selective unidirectional waveguiding to a 2D metasurface, a selective directional control of waves in two dimensions is demonstrated opening up possibilities for directional wireless signal transfer via magnetoinductive surfaces. The observed phenomenon is analogous to polarisation-controlled near-field interference for unidirectional guiding of surface plasmon-polaritons.
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27
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Kostina N, Petrov M, Bobrovs V, Shalin AS. Optical pulling and pushing forces via Bloch surface waves. OPTICS LETTERS 2022; 47:4592-4595. [PMID: 36107040 DOI: 10.1364/ol.464037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
For flexible tailoring of optical forces, as well as for extraordinary optomechanical effects, additional degrees of freedom should be introduced into a system. Here, we demonstrate that photonic crystals are a versatile platform for optical manipulation due to both Bloch surface waves (BSWs) and the complex character of the reflection coefficient paving a way for controlled optomechanical interactions. We demonstrate enhanced pulling and pushing transversal optical forces acting on a single dipolar bead above a one-dimensional photonic crystal due to directional excitation of BSWs. Our results demonstrate angle- or wavelength-assisted switching between BSW-induced optical pulling and pushing forces. Easy to fabricate for any desired spectral range, photonic crystals are shown to be prospective for precise optical sorting of nanoparticles, which are difficult to sort with conventional optomechanical methods. Our approach opens opportunities for novel, to the best of our knowledge, optical manipulation schemes and platforms, and enhanced light-matter interaction in optical trapping setups.
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28
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Yu T, Bauer GEW. Efficient Gating of Magnons by Proximity Superconductors. PHYSICAL REVIEW LETTERS 2022; 129:117201. [PMID: 36154429 DOI: 10.1103/physrevlett.129.117201] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 08/08/2022] [Accepted: 08/29/2022] [Indexed: 06/16/2023]
Abstract
Electrostatic gating confines and controls the transport of electrons in integrated circuits. Magnons, the quanta of spin waves of the magnetic order, are promising alternative information carriers, but difficult to gate. Here we report that superconducting strips on top of thin magnetic films can totally reflect magnons by their diamagnetic response to the magnon stray fields. The induced large frequency shifts unidirectionally block the magnons propagating normal to the magnetization. Two superconducting gates parallel to the magnetization create a magnonic cavity. The option to gate coherent magnons adds functionalities to magnonic devices, such as reprogrammable logical devices and increased couplings to other degrees of freedom.
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Affiliation(s)
- Tao Yu
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Gerrit E W Bauer
- WPI-AIMR and Institute for Materials Research and CSRN, Tohoku University, Sendai 980-8577, Japan
- Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands
- Kavli Institute for Theoretical Sciences, University of the Chinese Academy of Sciences, Beijing 100190, China
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29
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Peng L, Ren H, Liu YC, Lan TW, Xu KW, Ye DX, Sun HB, Xu S, Chen HS, Zhang S. Spin Hall effect of transversely spinning light. SCIENCE ADVANCES 2022; 8:eabo6033. [PMID: 36026456 PMCID: PMC9417169 DOI: 10.1126/sciadv.abo6033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Light carries spin angular momentum, which, in the free space, is aligned to the direction of propagation and leads to intriguing spin Hall phenomena at an interface. Recently, it was shown that a transverse-spin (T-spin) state could exist for surface waves at an interface or for bulk waves inside a judiciously engineered metamaterial, with the spin oriented perpendicular to the propagation direction. Here, we demonstrate the spin Hall effect for transversely spinning light-a T-spin-induced beam shift at the interface of a metamaterial. It is found that the beam shift takes place in the plane of incidence, in contrast to the well-known Imbert-Fedorov shifts. The observed T-spin-induced beam shift is of geometrodynamical nature, which can be rendered positive or negative controlled by the orientation of T-spin of the photons. The unconventional spin Hall effect of light found here provides a previously unexplored mechanism for manipulating light-matter interactions at interfaces.
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Affiliation(s)
- Liang Peng
- School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, China
- School of electronics and information, Hangzhou Dianzi University, Hangzhou, China
| | - Hang Ren
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China
| | - Ya-Chao Liu
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
| | - Tian-Wei Lan
- School of electronics and information, Hangzhou Dianzi University, Hangzhou, China
| | - Kui-Wen Xu
- School of electronics and information, Hangzhou Dianzi University, Hangzhou, China
| | - De-Xin Ye
- Laboratory of Applied Research on Electromagnetics (ARE), Zhejiang University, Hangzhou, China
| | - Hong-Bo Sun
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, China
| | - Su Xu
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China
| | - Hong-Sheng Chen
- State Key Laboratory of Modern Optical Instrumentation, Interdisciplinary Center for Quantum Information, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
| | - Shuang Zhang
- Department of Physics, University of Hong Kong, Hong Kong, China
- Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, China
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30
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Zhang Q, Ou Q, Si G, Hu G, Dong S, Chen Y, Ni J, Zhao C, Fuhrer MS, Yang Y, Alù A, Hillenbrand R, Qiu CW. Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals. SCIENCE ADVANCES 2022; 8:eabn9774. [PMID: 35905184 PMCID: PMC9337755 DOI: 10.1126/sciadv.abn9774] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 06/14/2022] [Indexed: 05/28/2023]
Abstract
Advanced control over the excitation of ultraconfined polaritons-hybrid light and matter waves-empowers unique opportunities for many nanophotonic functionalities, e.g., on-chip circuits, quantum information processing, and controlling thermal radiation. Recent work has shown that highly asymmetric polaritons are directly governed by asymmetries in crystal structures. Here, we experimentally demonstrate extremely asymmetric and unidirectional phonon polariton (PhP) excitation via directly patterning high-symmetry orthorhombic van der Waals (vdW) crystal α-MoO3. This phenomenon results from symmetry breaking of momentum matching in polaritonic diffraction in vdW materials. We show that the propagation of PhPs can be versatile and robustly tailored via structural engineering, while PhPs in low-symmetry (e.g., monoclinic and triclinic) crystals are largely restricted by their naturally occurring permittivities. Our work synergizes grating diffraction phenomena with the extreme anisotropy of high-symmetry vdW materials, enabling unexpected control of infrared polaritons along different pathways and opening opportunities for applications ranging from on-chip photonics to directional heat dissipation.
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Affiliation(s)
- Qing Zhang
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 611731, China
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Qingdong Ou
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, Clayton, Victoria 3800, Australia
- Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
- Macao Institute of Materials Science and Engineering (MIMSE) , Macau University of Science and Technology, Taipa, Macau SAR 999078, China
| | - Guangyuan Si
- Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility, Clayton, Victoria 3800, Australia
| | - Guangwei Hu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
- Advanced Science Research Center, City University of New York, New York, NY 10031, USA
| | - Shaohua Dong
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Yang Chen
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027 China
| | - Jincheng Ni
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Chen Zhao
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Michael S. Fuhrer
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, Clayton, Victoria 3800, Australia
- School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
| | - Yuanjie Yang
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Andrea Alù
- Advanced Science Research Center, City University of New York, New York, NY 10031, USA
- Physics Program, Graduate Center, City University of New York, New York, NY 10016, USA
| | - Rainer Hillenbrand
- CIC nanoGUNE BRTA and Department of Electricity and Electronics, UPV/EHU, 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Cheng-Wei Qiu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
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31
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Shi P, Lei X, Zhang Q, Li H, Du L, Yuan X. Intrinsic Spin-Momentum Dynamics of Surface Electromagnetic Waves in Dispersive Interfaces. PHYSICAL REVIEW LETTERS 2022; 128:213904. [PMID: 35687452 DOI: 10.1103/physrevlett.128.213904] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 04/26/2022] [Indexed: 06/15/2023]
Abstract
Intrinsic spin-momentum locking is an inherent property of surface electromagnetic fields and its study has led to the discovery of phenomena such as unidirectional guided waves and photonic spin lattices. Previously, dispersion was ignored in spin-momentum locking, resulting in anomalies contradicting the apparent physical reality. Here, we formulate four dispersive spin-momentum equations, revealing in theory that transverse spin is locked with kinetic momentum. Moreover, in dispersive metal or magnetic materials spin-momentum locking obeys the left-hand screw rule. In addition to dispersion, structural features can affect substantially this locking. Remarkably, an extraordinary spin originating from coupling polarization ellipticities is uncovered that depends on the symmetry of the field modes. We further identify the properties of this spin-momentum locking with diverse photonic topological lattices by engineering their rotational symmetry akin to that in solid-state physics. The concept of spin-momentum locking based on photon flow properties translates easily to other classical wave fields.
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Affiliation(s)
- Peng Shi
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
| | - Xinrui Lei
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
| | - Qiang Zhang
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
| | - Heng Li
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
| | - Luping Du
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
| | - Xiaocong Yuan
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
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32
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Han L, Chen S, Chen H. Water Wave Polaritons. PHYSICAL REVIEW LETTERS 2022; 128:204501. [PMID: 35657890 DOI: 10.1103/physrevlett.128.204501] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 04/12/2022] [Indexed: 06/15/2023]
Abstract
We find that a one-dimensional groove array can be equivalent to a negative water depth and excite unidirectional surface polaritons for water waves. We explain this phenomenon through theoretical analysis, numerical simulations, and experiments. This phenomenon shows that the propagation direction of water waves can be manipulated through such simple structures, which will be very important in offshore transportation and environmental protection.
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Affiliation(s)
- Linkang Han
- Department of Physics and Institute of Electromagnetics Acoustics, Xiamen University, Xiamen 361005, China
- Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China
| | - Shiming Chen
- Department of Physics and Institute of Electromagnetics Acoustics, Xiamen University, Xiamen 361005, China
- Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China
| | - Huanyang Chen
- Department of Physics and Institute of Electromagnetics Acoustics, Xiamen University, Xiamen 361005, China
- Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China
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33
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Liu W, Zhang Y, Min C, Yuan X. Controllable transportation of microparticles along structured waveguides by the plasmonic spin-hall effect. OPTICS EXPRESS 2022; 30:16094-16103. [PMID: 36221461 DOI: 10.1364/oe.451250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 04/11/2022] [Indexed: 06/16/2023]
Abstract
With the nanoscale integration advantage of near field photonics, controllable manipulation and transportation of micro-objects have possessed plentiful applications in the fields of physics, biology and material sciences. However, multifunctional optical manipulation like controllable transportation and synchronous routing by nano-devices are limited and rarely reported. Here we propose a new type of Y-shaped waveguide optical conveyor belt, which can transport and route particles along the structured waveguide based on the plasmonic spin-hall effect. The routing of micro-particles in different branches is determined by the optical force components difference at the center of the Y junction along the two branches of the waveguide. The influence of light source and structural parameters on the optical forces and transportation capability are numerically studied. The results illustrate that the proposed structured waveguide optical conveyor belt can transport the microparticles controllably in different branches of the waveguide. Due to the selective transportation ability of microparticles by the 2D waveguide, our work shows great application potential in the region of on-chip optical manipulation.
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34
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Liu H, Xie Z, Xu J, Yuan L. On-Chip Photon Angular Momentum Absolute Measurement Based on Angle Detection. NANOMATERIALS 2022; 12:nano12050847. [PMID: 35269334 PMCID: PMC8912498 DOI: 10.3390/nano12050847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/26/2022] [Accepted: 02/28/2022] [Indexed: 12/04/2022]
Abstract
Photon angular momentum (AM) has been widely studied due to its unique properties. The accurate detection of photon AM is very important in its wide applications. Though various on-chip AM detectors based on surface plasmon polaritons (SPPs) have been proposed, most of them can only realize relative measurement. For example, most photon orbital angular momentum (OAM) detectors measure the high order OAM via measuring the relative interval between the intensity spots of the SPPs excited by the target order OAM beam and the reference order (usually 0th order) OAM beam. In this paper, we propose a simple on-chip photon AM detector. It can realize absolute measurement of photon OAM via angle detection, whose measurement result does not depend on the measurement of any reference OAM beam. At the same time, it can also recognize photon spin angular momentum (SAM). The proposed detector provides a new way for absolute measurement of photon AM, which may have some potential applications in the field of integrated photonic device.
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Affiliation(s)
- Houquan Liu
- Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Z.X.); (J.X.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
- Guangxi Key Laboratory of Automatic Detecting Technology and Instrument, Guilin University of Electronics Technology, Guilin 541004, China
- Correspondence:
| | - Zhenghao Xie
- Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Z.X.); (J.X.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| | - Jiankang Xu
- Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Z.X.); (J.X.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| | - Libo Yuan
- Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Z.X.); (J.X.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
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35
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Liu L, Krasavin AV, Zheng J, Tong Y, Wang P, Wu X, Hecht B, Pan C, Li J, Li L, Guo X, Zayats AV, Tong L. Atomically Smooth Single-Crystalline Platform for Low-Loss Plasmonic Nanocavities. NANO LETTERS 2022; 22:1786-1794. [PMID: 35129980 DOI: 10.1021/acs.nanolett.2c00095] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nanoparticle-on-mirror plasmonic nanocavities, capable of extreme optical confinement and enhancement, have triggered state-of-the-art progress in nanophotonics and development of applications in enhanced spectroscopies. However, the optical quality factor and thus performance of these nanoconstructs are undermined by the granular polycrystalline metal films (especially when they are optically thin) used as a mirror. Here, we report an atomically smooth single-crystalline platform for low-loss nanocavities using chemically synthesized gold microflakes as a mirror. Nanocavities constructed using gold nanorods on such microflakes exhibit a rich structure of plasmonic modes, which are highly sensitive to the thickness of optically thin (down to ∼15 nm) microflakes. The microflakes endow nanocavities with significantly improved quality factor (∼2 times) and scattering intensity (∼3 times) compared with their counterparts based on deposited films. The developed low-loss nanocavities further allow for the integration with a mature platform of fiber optics, opening opportunities for realizing nanocavity-based miniaturized photonic devices for practical applications.
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Affiliation(s)
- Lufang Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Alexey V Krasavin
- Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London WC2R 2LS, U.K
| | - Junsheng Zheng
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yuanbiao Tong
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Pan Wang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xiaofei Wu
- NanoOptics & Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Bert Hecht
- NanoOptics & Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Chenxinyu Pan
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jialin Li
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Linjun Li
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xin Guo
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Anatoly V Zayats
- Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London WC2R 2LS, U.K
| | - Limin Tong
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
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36
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Lang B, McCutcheon DPS, Harbord E, Young AB, Oulton R. Perfect Chirality with Imperfect Polarization. PHYSICAL REVIEW LETTERS 2022; 128:073602. [PMID: 35244437 DOI: 10.1103/physrevlett.128.073602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Unidirectional (chiral) emission of light from a circular dipole emitter into a waveguide is only possible at points of perfect circular polarization (C points), with elliptical polarizations yielding a lower directional contrast. However, there is no need to restrict engineered systems to circular dipoles, and with an appropriate choice of dipole unidirectional emission is possible for any elliptical polarization. Using elliptical dipoles, rather than circular, typically increases the size of the area suitable for chiral interactions (in an exemplary mode by a factor ∼30), while simultaneously increasing coupling efficiencies. We propose illustrative schemes to engineer the necessary elliptical transitions in both atomic systems and quantum dots.
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Affiliation(s)
- Ben Lang
- Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom
| | - Dara P S McCutcheon
- Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom
| | - Edmund Harbord
- Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom
| | - Andrew B Young
- Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom
| | - Ruth Oulton
- Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom
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37
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Pacheco-Peña V, Hallam T, Healy N. MXene supported surface plasmons on telecommunications optical fibers. LIGHT, SCIENCE & APPLICATIONS 2022; 11:22. [PMID: 35067682 PMCID: PMC8784538 DOI: 10.1038/s41377-022-00710-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 11/25/2021] [Accepted: 01/05/2022] [Indexed: 05/27/2023]
Abstract
MXenes, an emerging class of two-dimensional materials, exhibit characteristics that promise significant potential for their use in next generation optoelectronic sensors. An interplay between interband transitions and boundary effects offer the potential to tune the plasma frequencies over a large spectral range from the near-infrared to the mid-infrared. This tuneability along with the 'layered' nature of the material not only offer the flexibility to produce plasmon resonances across a wide range of wavelengths, but also add a degree of freedom to the sensing mechanism by allowing the plasma frequency to be modulated. Here we show, numerically, that MXenes can support plasmons in the telecommunications frequency range and that surface plasmon resonances can be excited on a standard MXene coated side polished optical fiber. Thus, presenting the tantalising prospect of highly selective distributed optical fiber sensor networks.
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Affiliation(s)
- Victor Pacheco-Peña
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
| | - Toby Hallam
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK
| | - Noel Healy
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
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38
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Yin X, Yang C, Li J, Zhang Y, Zhao C. Mapping the spin angular momentum distribution of focused linearly and circularly polarized vortex fields. APPLIED OPTICS 2022; 61:115-119. [PMID: 35200802 DOI: 10.1364/ao.443201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
Using the previously proposed spin-resolved near-field scanning optical microscopy (NSOM) technique, we mapped the spin angular momentum (SAM) axial component (Sz) distributions of tightly focused linearly and circularly polarized vortex beams. The system's effectiveness was confirmed in our previous article by mapping various tightly focused cylindrical vector vortex beams. The SAM of different focused vortex light fields is essential in the research of near-field spin optics and topological photonics. The SAM distributions of different orders of linearly and circularly polarized vortex beams were mapped by separating their right spin (IRCP) and left spin component (ILCP) using the relationship Sz∝IRCP-ILCP.
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39
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Chen PG, Li Z, Qi Y, Lo TW, Wang S, Jin W, Wong KY, Fan S, Zayats AV, Lei D. Long-Range Directional Routing and Spatial Selection of High-Spin-Purity Valley Trion Emission in Monolayer WS 2. ACS NANO 2021; 15:18163-18171. [PMID: 34730338 DOI: 10.1021/acsnano.1c06955] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Valley-dependent excitation and emission in transition metal dichalcogenides (TMDCs) have recently emerged as a new avenue for optical data manipulation, quantum optical technologies, and chiral photonics. The valley-polarized electronic states can be optically addressed through photonic spin-orbit interaction of excitonic emission, typically with plasmonic nanostructures, but their performance is limited by the low quantum yield of neutral excitons in TMDC multilayers and the large Ohmic loss of plasmonic systems. Here, we demonstrate a valleytronic system based on the trion emission in high-quantum-yield WS2 monolayers chirally coupled to a low-loss microfiber. The integrated system uses the spin properties of the waveguided modes to achieve long-range directional routing of valley excitations and also provides an approach to selectively address valley-dependent emission from different spatial locations around the microfiber. This valleytronic interface can be integrated with fiber communication devices, allowing for merging valley polarization and chiral photonics as an alternative mechanism for optical information transport and manipulation in classical and quantum regimes.
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Affiliation(s)
- Pei-Gang Chen
- Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China
| | - Zhiyong Li
- State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Yun Qi
- Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Tsz Wing Lo
- Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China
| | - Shubo Wang
- Department of Physics, City University of Hong Kong, Hong Kong 999077, China
| | - Wei Jin
- Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Kwok-Yin Wong
- State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Shanhui Fan
- Department of Electrical Engineering and Ginzton Laboratory, Stanford University, Stanford, California 94305-4088, United States
| | - Anatoly V Zayats
- Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London WC2R 2LS, U.K
| | - Dangyuan Lei
- Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China
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40
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Xiong L, Li Y, Halbertal D, Sammon M, Sun Z, Liu S, Edgar JH, Low T, Fogler MM, Dean CR, Millis AJ, Basov DN. Polaritonic Vortices with a Half-Integer Charge. NANO LETTERS 2021; 21:9256-9261. [PMID: 34709832 DOI: 10.1021/acs.nanolett.1c03175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Topological spin textures are field arrangements that cannot be continuously deformed to a fully polarized state. In particular, merons are topological textures characterized by half-integer topological charge ±1/2 and vortex-like swirling patterns at large distances. Merons have been studied previously in the context of cosmology, fluid dynamics, condensed matter physics and plasmonics. Here, we visualized optical spin angular momentum of phonon polaritons that resembles nanoscale meron spin textures. Phonon polaritons, hybrids of infrared photons and phonons in hexagonal boron nitride, were excited by circularly polarized light incident on a ring-shaped antenna and imaged using infrared near-field techniques. The polariton field reveals a half-integer topological charge determined by the handedness of the incident beam. Our phonon polaritonic platform opens up new pathways to create, control, and visualize topological textures.
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Affiliation(s)
- Lin Xiong
- Columbia University, New York, New York 10027, United States
| | - Yutao Li
- Columbia University, New York, New York 10027, United States
| | - Dorri Halbertal
- Columbia University, New York, New York 10027, United States
| | - Michael Sammon
- University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Zhiyuan Sun
- Columbia University, New York, New York 10027, United States
| | - Song Liu
- Kansas State University, Manhattan, New York 66506, United States
| | - James H Edgar
- Kansas State University, Manhattan, New York 66506, United States
| | - Tony Low
- University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Michael M Fogler
- University of California San Diego, La Jolla, California 92093, United States
| | - Cory R Dean
- Columbia University, New York, New York 10027, United States
| | - Andrew J Millis
- Columbia University, New York, New York 10027, United States
- Center for Computational Quantum Physics, The Flatiron Institute, New York, New York 10010, United States
| | - D N Basov
- Columbia University, New York, New York 10027, United States
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41
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Analytical Calculations of Scattering Amplitude of Surface Plasmon Polaritons Excited by a Spherical Nanoantenna. NANOMATERIALS 2021; 11:nano11112937. [PMID: 34835701 PMCID: PMC8625512 DOI: 10.3390/nano11112937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/20/2021] [Accepted: 10/20/2021] [Indexed: 11/16/2022]
Abstract
Since surface plasmon polaritons (SPPs) are surface waves, they cannot be excited by an incident plane wave, because free-space photons do not possess a sufficient in-plane momentum. Phase matching between the incident light and SPP can be achieved using a high-refractive-index prism, grating, or nanoantennas. In this work, we found an expression for the amplitude of SPP excited by an arbitrary 3D current distribution placed near a metal interface. The developed method is based on the well-known technique used in waveguide theory that enables finding the amplitudes of waveguide modes excited by the external currents. It reduces the SPP excitation problem to the summation of the set of emitters. As a particular example, we considered a spherical dipole nanoantenna on a metal substrate illuminated by a normally incident plane wave. The analytical calculations were in good agreement with the full-wave numerical simulations.
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Hinamoto T, Fujii M, Sannomiya T. Optical spin sorting chain. OPTICS EXPRESS 2021; 29:34951-34961. [PMID: 34808942 DOI: 10.1364/oe.437725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Transverse spin angular momentum of light is a key concept in recent nanophotonics to realize unidirectional light transport in waveguides by spin-momentum locking. Herein we theoretically propose subwavelength nanoparticle chain waveguides that efficiently sort optical spins with engineerable spin density distributions. By arranging high-refractive-index nanospheres or nanodisks of different sizes in a zigzag manner, directional optical spin propagation is realized. The origin of efficient spin transport is revealed by analyzing the dispersion relation and spin angular momentum density distributions, being attributed to guided modes that possess transverse spin angular momenta. In contrast to conventional waveguides, the proposed asymmetric waveguide can spatially separate up- and down-spins and locate one parity inside and the other outside the structure. Moreover, robustness against bending the waveguide and its application as an optical spin sorter are presented. Compared to previous reports on spatial engineering of local spins in photonic crystal waveguides, we achieved miniaturization of the entire footprint down to the subwavelength scale.
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Verma SK, Srivastava SK. Giant Extra-Ordinary Near Infrared Transmission from Seemingly Opaque Plasmonic Metasurface: Sensing Applications. PLASMONICS (NORWELL, MASS.) 2021; 17:653-663. [PMID: 34690613 PMCID: PMC8526055 DOI: 10.1007/s11468-021-01551-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Accepted: 09/27/2021] [Indexed: 06/13/2023]
Abstract
In the present study, we report giant extra-ordinary transmission of near infrared (NIR) light, more than 90%, through a seemingly opaque plasmonic metasurface, which consists of two metal nano-slits arrays (MNSAs) with alternate opening arrangements. By using perfect coupling of the plasmonic modes formed between the sharp edges of the upper and lower MNSAs of silver, a giant, wavelength selective transmission could be obtained. The study is accompanied by optimization of electromagnetic (EM) field coupling for different interlayer spacings and lateral overlap between the two MNSAs to understand their significance in light transmission through the metasurface. The interlayer spacing between the MNSAs works as the transmitting channel for light. The optimization of performance with different fill factors and plasmonic metals was performed as well. Because of the excitation of extended surface plasmons (ESPs) generated at both the MNSAs, the metasurface can be used for refractive index (RI) sensing as one of its applications by using a transparent and flexible polymer, such as polydimethylsiloxane (PDMS), as substrate. The maximum sensitivity which could be achieved for the optimal configuration of the metasurface was 1435.71 nm/RIU, with a figure of merit (FOM) of 80 RIU-1 for 90.45% optical transmission of light for the refractive index variation of analyte medium from 1.33 to 1.38 RIU. The present study strengthens the concept of light funneling through subwavelength structures due to plasmons, which are responsible for light transmission through this seemingly opaque metasurface and finds use in highly sensitive, flexible, and cost-effective EOT-based sensors.
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Affiliation(s)
- Sagar Kumar Verma
- Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar, Uttarakhand 247667 India
| | - Sachin K. Srivastava
- Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar, Uttarakhand 247667 India
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Fang L, Zheng S, Wang J. Design of on-chip polarimetry with Stokes-determined silicon photonic circuits. OPTICS EXPRESS 2021; 29:31026-31035. [PMID: 34615204 DOI: 10.1364/oe.437410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
Measuring the states of optical polarization is crucial in many scientific and technological disciplines, and more recently towards the development of chip-scale or nanoscale polarimetry. Here we present a new design of on-chip Stokes polarimetric scheme based on polarization-dependent silicon photonic circuits. The structural elements including polarization rotator and splitter, directional coupler, and phase shifter are assembled to produce polarization-dependent silicon photonic circuits. The orthogonally linear, diagonal, and circular polarization components of the incident light, corresponding to the three Stokes parameters (S1, S2, and S3), can be simultaneously measured based on the Stokes-determined silicon photonic circuit output arrays so as to realize the full measurement of the incident polarization states. This on-chip polarimetry proposed here may enrich the family of micro-nano polarimetric devices, and pave the way to polarization-based integrated optoelectronics, nanophotonics, and metrology.
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Zhao LM, Zhou YS. Unidirectional propagation of the Bloch surface wave excited by the spinning magnetic dipole in two-dimensional photonic crystal slab. Sci Rep 2021; 11:18452. [PMID: 34531480 PMCID: PMC8445978 DOI: 10.1038/s41598-021-98056-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 07/26/2021] [Indexed: 11/25/2022] Open
Abstract
The photonic spin Hall effect (PSHE) can be realized in a photonic crystal (PC) slab, that is, the unidirectional Bloch surface wave can propagate along the surface of the PC slab under the excitation of elliptical polarized magnetic dipole. It is further proved that PSHE is caused by the interference of the component surface waves excited by the different components of the incident light, which is the so called component wave interference (CWI) theory. In addition, we also find that the spin of the surface wave oscillates periodically in space, and the oscillation period is a unit cell. In a unit cell, the average spin keeps the spin orbit locked. The results show that the spin separation can also be modulated by the position and the polarization state of the magnetic dipole.
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Affiliation(s)
- Li-Ming Zhao
- Department of Physics, Capital Normal University, Beijing, 100048, China.
| | - Yun-Song Zhou
- Department of Physics, Capital Normal University, Beijing, 100048, China
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Interface nano-optics with van der Waals polaritons. Nature 2021; 597:187-195. [PMID: 34497390 DOI: 10.1038/s41586-021-03581-5] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 04/23/2021] [Indexed: 01/27/2023]
Abstract
Polaritons are hybrid excitations of matter and photons. In recent years, polaritons in van der Waals nanomaterials-known as van der Waals polaritons-have shown great promise to guide the flow of light at the nanoscale over spectral regions ranging from the visible to the terahertz. A vibrant research field based on manipulating strong light-matter interactions in the form of polaritons, supported by these atomically thin van der Waals nanomaterials, is emerging for advanced nanophotonic and opto-electronic applications. Here we provide an overview of the state of the art of exploiting interface optics-such as refractive optics, meta-optics and moiré engineering-for the control of van der Waals polaritons. This enhanced control over van der Waals polaritons at the nanoscale has not only unveiled many new phenomena, but has also inspired valuable applications-including new avenues for nano-imaging, sensing, on-chip optical circuitry, and potentially many others in the years to come.
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Tunable multichannel Photonic spin Hall effect in metal-dielectric-metal waveguide. Sci Rep 2021; 11:14138. [PMID: 34238971 PMCID: PMC8266915 DOI: 10.1038/s41598-021-93517-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 06/24/2021] [Indexed: 11/22/2022] Open
Abstract
The discovery of Photonic spin Hall effect (PSHE) on surface plasmon polaritons (SPPs) is an important progress in photonics. In this paper, a method of realizing multi-channel PSHE in two-dimensional metal-air-metal waveguide is proposed. By modulating the phase difference \documentclass[12pt]{minimal}
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\begin{document}$$\theta$$\end{document}θ of the dipole source, the SPP can propagate along a specific channel. We further prove that PSHE results from the component wave interference theory. We believe that our findings will rich the application of SPPs in optical devices.
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Wang R, Lei X, Jin Y, Wen X, Du L, Wu A, Zayats AV, Yuan X. Directional imbalance of Bloch surface waves for ultrasensitive displacement metrology. NANOSCALE 2021; 13:11041-11050. [PMID: 34142682 DOI: 10.1039/d1nr01251g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Precise position sensing and nanoscale optical rulers are important in many applications in nanometrology, gravitational wave detection and quantum technologies. Several implementations of such nanoscale displacement sensors have been recently developed based on interferometers, nanoantennas, optical field singularities and optical skyrmions. Here, we propose a method for ultrasensitive displacement measurements based on the directional imbalance of the excitation of Bloch surface waves by an asymmetric double slit, which have low propagation loss and provide high detected intensity. The directionality of excitation changes dramatically with a sub-nanometric displacement of the illuminating Gaussian beam across the slit and can be used for displacement and refractive index metrology. We demonstrate a theoretical intensity ratio of the BSW excitation in opposite directions exceeding 890, which provides a displacement sensitivity of up to 2.888 nm-1 with a resolution below 0.5 nm over a 100 nm linearity range. Experimentally, a directional intensity ratio more than 90 has been achieved, with a displacement sensitivity of 0.122 nm-1 over a 300 nm linearity range, resulting in a resolution below 8 nm for a 600 nm illumination wavelength. The proposed facile configuration may have potential applications in nanometrology and super-resolution microscopy.
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Affiliation(s)
- Ruxue Wang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai, 200050, P.R. China.
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Sonner MM, Khosravi F, Janker L, Rudolph D, Koblmüller G, Jacob Z, Krenner HJ. Ultrafast electron cycloids driven by the transverse spin of a surface acoustic wave. SCIENCE ADVANCES 2021; 7:eabf7414. [PMID: 34321198 PMCID: PMC8318372 DOI: 10.1126/sciadv.abf7414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 06/11/2021] [Indexed: 06/01/2023]
Abstract
Spin-momentum locking is a universal wave phenomenon promising for applications in electronics and photonics. In acoustics, Lord Rayleigh showed that surface acoustic waves exhibit a characteristic elliptical particle motion strikingly similar to spin-momentum locking. Although these waves have become one of the few phononic technologies of industrial relevance, the observation of their transverse spin remained an open challenge. Here, we observe the full spin dynamics by detecting ultrafast electron cycloids driven by the gyrating electric field produced by a surface acoustic wave propagating on a slab of lithium niobate. A tubular quantum well wrapped around a nanowire serves as an ultrafast sensor tracking the full cyclic motion of electrons. Our acousto-optoelectrical approach opens previously unknown directions in the merged fields of nanoacoustics, nanophotonics, and nanoelectronics for future exploration.
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Affiliation(s)
- Maximilian M Sonner
- Lehrstuhl für Experimentalphysik 1, Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
| | - Farhad Khosravi
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
- Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906, USA
| | - Lisa Janker
- Lehrstuhl für Experimentalphysik 1, Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
| | - Daniel Rudolph
- Walter Schottky Institut and Physik Department E24, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
| | - Gregor Koblmüller
- Walter Schottky Institut and Physik Department E24, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
| | - Zubin Jacob
- Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906, USA.
| | - Hubert J Krenner
- Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
- Lehrstuhl für Experimentalphysik 1, Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
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Guddala S, Kawaguchi Y, Komissarenko F, Kiriushechkina S, Vakulenko A, Chen K, Alù A, M Menon V, Khanikaev AB. All-optical nonreciprocity due to valley polarization pumping in transition metal dichalcogenides. Nat Commun 2021; 12:3746. [PMID: 34145288 PMCID: PMC8213841 DOI: 10.1038/s41467-021-24138-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 05/31/2021] [Indexed: 02/05/2023] Open
Abstract
Nonreciprocity and nonreciprocal optical devices play a vital role in modern photonic technologies by enforcing one-way propagation of light. Here, we demonstrate an all-optical approach to nonreciprocity based on valley-selective response in transition metal dichalcogenides (TMDs). This approach overcomes the limitations of magnetic materials and it does not require an external magnetic field. We provide experimental evidence of photoinduced nonreciprocity in a monolayer WS2 pumped by circularly polarized (CP) light. Nonreciprocity stems from valley-selective exciton population, giving rise to nonlinear circular dichroism controlled by CP pump fields. Our experimental results reveal a significant effect even at room temperature, despite considerable intervalley-scattering, showing promising potential for practical applications in magnetic-free nonreciprocal platforms. As an example, here we propose a device scheme to realize an optical isolator based on a pass-through silicon nitride (SiN) ring resonator integrating the optically biased TMD monolayer.
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Affiliation(s)
- Sriram Guddala
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
| | - Yuma Kawaguchi
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
| | - Filipp Komissarenko
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
| | - Svetlana Kiriushechkina
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
| | - Anton Vakulenko
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
| | - Kai Chen
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
- Physics Program, Graduate Center of the City University of New York, New York, NY, USA
| | - Andrea Alù
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA
- Physics Program, Graduate Center of the City University of New York, New York, NY, USA
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, USA
| | - Vinod M Menon
- Physics Program, Graduate Center of the City University of New York, New York, NY, USA
- Department of Physics, City College of New York, New York, NY, USA
| | - Alexander B Khanikaev
- Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, New York, NY, USA.
- Physics Program, Graduate Center of the City University of New York, New York, NY, USA.
- Department of Physics, City College of New York, New York, NY, USA.
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