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terahertz bound states in the continuum with incident angle robustness induced by a dual period metagrating

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Photonics Research 2022年第3期10卷 810-819页

作者： Wenqiao Shi Jianqiang Gu Xingyuan Zhang Quan Xu Jiaguang Han Quanlong Yang Longqing Cong Weili Zhang Center for terahertz waves and college of precision instrument and Optoelectronics engineering Tianjin Universityand Key Laboratory of Optoelectronics Information and TechnologyMinistry of EducationTianjin 300072China Nonlinear Physics centre Australian National UniversityCanberraACT 2601Australia Department of Electrical and Electronic engineering Southern University of Science and TechnologyShenzhen 518055China School of Electrical and Computer engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Metasurface-empowered bound state in the continuum(BIC)provides a unique route for fascinating functional devices with infinitely high quality *** method is particularly attractive to the terahertz community because it may essentially solve the deficiencies in terahertz filters,sensors,lasers,and nonlinear ***,most BIC metasurfaces are limited to specified incident angles that seriously dim their application ***,we propose that a dual-period dielectric metagrating can support multiple families of BICs that originate from guided mode resonances in the dielectric grating and exhibit infinite quality factors at arbitrarily tilted *** robustness was analyzed based on the Bloch theory and verified at tilted incident *** also demonstrate that inducing geometric asymmetry is an efficient way to manipulate the leakage and coupling of these BICs,which can mimic the electromagnetically induced transparency(EIT)effect in our dual-period *** this demonstration,a slow-light effect with a measured group delay of 117 ps was *** incidence-insensitive BICs proposed here may greatly extend the application scenarios of the BIC *** high Q factor and outstanding slow-light effect in the metagrating show exciting prospects in realizing high-performance filters,sensors,and modulators for prompting terahertz applications.

关键词： incident dielectric continuum

Topology-empowered membrane devices for terahertz photonics

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Advanced Photonics 2022年第4期4卷 29-37页

作者： Quanlong Yang Dongyang Wang Sergey Kruk Mingkai Liu Ivan Kravchenko Jiaguang Han Yuri Kivshar Ilya Shadrivov Australian National University Nonlinear Physics CentreResearch School of PhysicsCanberra ActonAustralia Central South University School of Physics and ElectronicsChangshaChina The Hong Kong University of Science and Technology Department of PhysicsHong KongChina Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTennesseeUnited States Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringTianjinChina

Control of terahertz waves offers a profound platform for next-generation sensing,imaging,and information ***,all conventional terahertz components and systems suffer from bulky design,sensitivity to imperfections,and transmission *** propose and experimentally demonstrate onchip integration and miniaturization of topological devices,which may address many existing drawbacks of the terahertz *** design and fabricate topological devices based on valley-Hall photonic structures that can be employed for various integrated components of on-chip terahertz *** demonstrate valleylocked asymmetric energy flow and mode conversion with topological waveguide,multiport couplers,wave division,and whispering gallery mode *** devices are based on topological membrane metasurfaces,which are of great importance for developing on-chip photonics and bring many features into terahertz technology.

关键词： topological devices terahertz photonics membrane on-chip

Moiré-driven electromagnetic responses and magic angles in a sandwiched hyperbolic metasurface

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Photonics Research 2022年第9期10卷 2056-2065页

作者： YI LIU CHUNMEI OUYANG QUAN XU XIAOQIANG SU QUANLONG YANG JIAJUN MA YANFENG LI ZHEN TIAN JIANQIANG GU LIYUAN LIU JIAGUANG HAN YUNLONG SHI WEILI ZHANG Center for terahertz waves and college of precision instrument and Optoelectronics engineering Key Laboratory of Optoelectronic Information Technology(Ministry of Education of China)Tianjin UniversityTianjin 300072China Institute of Solid State Physics College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsShanxi Datong UniversityDatong 037009China Nonlinear Physics centre Australian National UniversityCanberraACT 2601Australia School of Electrical and Computer engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Recent moiréconfigurations provide a new platform for tunable and sensitive photonic responses,as their enhanced light–matter interactions originate from the relative displacement or rotation angle in a stacking bilayer or multilayer periodic ***,previous findings are mostly focused on atomically thin condensed matter,with limitations on the fabrication of multilayer structures and the control of rotation *** microwave moiréconfigurations are still difficult to ***,we design a novel moiréstructure,which presents unprecedented capability in the manipulation of light–matter *** on the effective medium theory and S-parameter retrieval process,the rotation matrix is introduced into the dispersion relation to analyze the underlying physical mechanism,where the permittivity tensor transforms from a diagonal matrix to a fully populated one,whereas the permeability tensor evolves from a unit matrix to a diagonal one and finally becomes fully filled,so that the electromagnetic responses change drastically as a result of stacking and ***,the experiment and simulation results reveal hybridization of eigenmodes,drastic manipulation of surface states,and magic angle properties by controlling the mutual rotation angles between two isolated ***,not only a more precisely controllable bilayer hyperbolic metasurface is introduced to moiréphysics,the findings also open up a new avenue to realize flat bands at arbitrary frequencies,which shows great potential in active engineering of surface waves and designing multifunctional plasmonic devices.

关键词： rotation hyperbolic diagonal

Anisotropic coding metamaterials and their powerful manipulation of differently polarized terahertz waves

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Light(Science & Applications) 2016年第1期5卷 767-777页

作者： Shuo Liu Tie Jun Cui Quan Xu Di Bao Liangliang Du Xiang Wan Wen Xuan Tang Chunmei Ouyang Xiao Yang Zhou Hao Yuan Hui Feng Ma Wei Xiang Jiang Jiaguang Han Weili Zhang Qiang Cheng State Key Laboratory of Millimeter waves Southeast UniversityNanjing 210096China Synergetic Innovation Center of Wireless Communication Technology Southeast UniversityNanjing 210096China Cooperative Innovation centre of terahertz Science Chengdu 610054China Center for terahertz waves and college of precision instrument and Optoelectronics engineering Tianjin UniversityTianjin 300072China Jiangsu Xuantu Technology Co. Ltd.Nanjing 211111China

Metamaterials based on effective media can be used to produce a number of unusual physical properties(for example,negative refraction and invisibility cloaking)because they can be tailored with effective medium parameters that do not occur in ***,the use of coding metamaterials has been suggested for the control of electromagnetic waves through the design of coding sequences using digital elements‘0’and‘1,'which possess opposite phase *** we propose the concept of an anisotropic coding metamaterial in which the coding behaviors in different directions are dependent on the polarization status of the electromagnetic *** experimentally demonstrate an ultrathin and flexible polarization-controlled anisotropic coding metasurface that functions in the terahertz regime using specially designed coding *** encoding the elements with elaborately designed coding sequences(both 1-bit and 2-bit sequences),the x-and y-polarized waves can be anomalously reflected or independently diffused in three *** simulated far-field scattering patterns and near-field distributions are presented to illustrate the dual-functional performance of the encoded metasurface,and the results are consistent with the measured *** further demonstrate the ability of the anisotropic coding metasurfaces to generate a beam splitter and realize simultaneous anomalous reflections and polarization conversions,thus providing powerful control of differently polarized electromagnetic *** proposed method enables versatile beam behaviors under orthogonal polarizations using a single metasurface and has the potential for use in the development of interesting terahertz devices.

关键词： anisotropic metamaterial design coding metamaterial metasurface terahertz waves

terahertz technology in intraoperative neurodiagnostics:A review

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Opto-Electronic Advances 2023年第5期6卷 41-67页

作者： Nikita V.Chernomyrdin Guzel R.Musina Pavel V.Nikitin Irina N.Dolganova Anna S.Kucheryavenko Anna I.Alekseeva Yuye Wang Degang Xu Qiwu Shi Valery V.Tuchin Kirill I.Zaytsev Prokhorov General Physics Institute of the Russian Academy of Sciences Moscow 119991Russia Bauman Moscow State Technical University Moscow 105005Russia Institute for Regenerative Medicine Sechenov UniversityMoscow 119991Russia Institute of Solid State Physics of the Russian Academy of Sciences Chernogolovka 142432Russia Research Institute of Human Morphology Moscow 117418Russia School of precision instrument and Optoelectronic engineering Tianjin UniversityTianjin 300000China college of Materials Science and engineering Sichuan UniversityChengdu 610000China Science Medical Center Saratov State UniversitySaratov 410012Russia Institute of precision Mechanics and Control FRC"Saratov Scientific Centre of the Russian Academy of Sciences"Saratov 410028Russia

terahertz(THz)technology offers novel opportunities in biology and medicine,thanks to the unique features of THzwave interactions with tissues and *** them,we particularly notice strong sensitivity of THz waves to the tissue water,as a medium for biochemical reactions and a main endogenous marker for THz spectroscopy and *** of the brain have an exceptionally high content of *** factor,along with the features of the structural organization and biochemistry of neuronal and glial tissues,makes the brain an exciting subject to study in the THz *** this paper,progress and prospects of THz technology in neurodiagnostics are overviewed,including diagnosis of neurodegenerative disease,myelin deficit,tumors of the central nervous system(with an emphasis on brain gliomas),and traumatic brain *** and applied challenges in study of the THz-wave–brain tissue interactions and development of the THz biomedical tools and systems for neurodiagnostics are discussed.

关键词： THz technology THz spectroscopy and imaging superresolution imaging biophotonics brain neurodiagnosis tumor glioma neurodegenerative diseases brain injury light scattering

All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting

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Light(Science & Applications) 2018年第1期7卷 766-774页

作者： Longqing Cong Yogesh Kumar Srivastava Huifang Zhang Xueqian Zhang Jiaguang Han Ranjan Singh Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Center for terahertz waves and college of precision instrument and Optoelectronics engineering Key Laboratory of Optoelectronic Information TechnologyMinistry of EducationTianjin University300072 TianjinPeople’s Republic of China

Miniaturized ultrafast switchable optical components with an extremely compact size and a high-speed response will be the core of next-generation all-optical devices instead of traditional integrated circuits,which are approaching the bottleneck of Moore’s *** have emerged as fascinating subwavelength flat optical components and devices for light focusing and holography ***,these devices exhibit a severe limitation due to their natural passive *** we introduce an active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz *** modulation of polarization states and the beam splitting ratio are experimentally demonstrated on a time scale of 667 *** scheme of hybrid metasurfaces could also be extended to the design of various free-space all-optical active devices,such as varifocal planar lenses,switchable vector beam generators,and components for holography in ultrafast imaging,display,and high-fidelity terahertz wireless communication systems.

关键词： polarization optical beam

Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

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Light(Science & Applications) 2015年第1期4卷 207-215页

作者： Li-Hua Gao Qiang Cheng Jing Yang Shao-Jie Ma Jie Zhao Shuo Liu Hai-Bing Chen Qiong He Wei-Xiang Jiang Hui-Feng Ma Qi-Ye Wen Lan-Ju Liang Biao-Bing Jin Wei-Wei Liu Lei Zhou Jian-Quan Yao Pei-Heng Wu Tie-Jun Cui State Key Laboratory of Millimeter waves Department of Radio EngineeringSoutheast UniversityNanjing 210096China Cooperative Innovation centre of terahertz Science No.4Section 2North Jianshe RoadChengdu 610054China Institute of Modern Optics Key Laboratory of Optical Information Science and Technology(Ministry of Education)Nankai UniversityTianjin 300071China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Department of PhysicsFudan UniversityShanghai 200433China State Key Laboratory of Electronic Films and Integrated Devices University of Electronic Science and TechnologyChengdu 610054China Research Institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Institute of Lasers and Optoelectronics College of Precision Instrument and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China

The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light *** the past decade,metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional ***,we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding *** propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding(with two phase states of 0 and 180°),2-bit coding(with four phase states of 0,90°,180°,and 270°),and multi-bit coding elements in the terahertz frequencies by using different geometric *** show that multi-bit coding metasurfaces have strong abilities to control terahertz waves by designing-specific coding *** an application,we demonstrate a new scattering strategy of terahertz waves—broadband and wide-angle diffusion—using a 2-bit coding metasurface with a special coding design and verify it by both numerical simulations and *** presented method opens a new route to reducing the scattering of terahertz waves.

关键词： coding diffusion metasurface terahertz waves