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Active control of EIT-like response in a symmetry-broken metasurface with orthogonal electric dipolar resonators

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Photonics Research 2019年第9期7卷 955-960页

作者： RUISHENG YANG QUANHONG FU YUANCHENG FAN WEIQI CAI KEPENG QIU WEIHONG ZHANG FULI ZHANG Research&Development Institute in Shenzhen Key Laboratory of Space Applied Physics and ChemistryMinistry of EducationandDepartment of Applied PhysicsSchool of Natural and Applied SciencesNorthwestern Polytechnical UniversityXi’an710072China School of mechanical Engineering Northwestern Polytechnical UniversityXi’an710072China

The active control of electromagnetic response in metamaterial and mutual coupling between resonant building blocks is of fundamental importance in realizing high-quality metamaterials. In this work, we propose and experimentally demonstrate the tunabilities of symmetry-broken metasurfaces made of orthogonal electric dipolar resonators. The metasurface with vertical and horizontal wires is integrated with a PIN diode for active *** is found that the electromagnetically induced transparency(EIT)-like spectrum appears due to the destructive or constructive interferences between the two electric dipolar modes when the structural symmetry broken is introduced to the metasurface. Different from previous works on the EIT-like effect, there is only electric dipole response in our metasuface. The microscopic response of the metasurface is numerically calculated to illustrate the mode coupling between the orthogonal electric dipolar resonators. By applying temporal coupled-mode theory,the interaction between the electromagnetic wave and the symmetry-broken metasurface is described, and the characteristic parameters of the resonator system, which determine the electromagnetic response of the metasurface, are acquired.

关键词： PIN EIT Active control of EIT-like response in a symmetry-broken metasurface with orthogonal electric dipolar resonators

Various topological phases and their abnormal effects of topological acoustic metamaterials

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Interdisciplinary Materials 2023年第2期2卷 179-230页

作者： Yan-Feng Chen Ze-Guo Chen Hao Ge Cheng He Xin Li Ming-Hui Lu Xiao-Chen Sun Si-Yuan Yu Xiujuan Zhang National Laboratory of Solid-State Microstructures&Department of Materials Science and Engineering Nanjing UniversityNanjingChina Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjingChina Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjingChina School of Materials Science and Intelligent Engineering Nanjing UniversitySuzhouChina School of mechanical Engineering Nanjing University of Science and TechnologyNanjingChina

The last 20 years have witnessed growing impacts of the topological concept on the branches of physics,including materials,electronics,photonics,and *** describes objects with some global invariant property under continuous deformation,which in mathematics could date back to the 17th century and mature in the 20th *** physics,it successfully underpinned the physics of the Quantum Hall effect in *** date,topology has been extensively applied to describe topological phases in acoustic *** artificial structures,acoustic metamaterials could be well theoretically analyzed,on-demand designed,and easily fabricated by modern techniques,such as three-dimensional *** new theoretical topological models were first discovered in acoustic metamaterials analogous to electronic counterparts,associated with novel effects for acoustics closer to *** this review,we focused on the concept of topology and its realization in airborne acoustic crystals,solid elastic phononic crystals,and surface acoustic wave *** also introduced emerging concepts of non-Hermitian,higher-order,and Floquet topological insulators in *** has been shown that the topology theory has such a powerful generality that among the disciplines from electron to photon and phonon,from electronic to photonics and acoustics,from acoustic topological theory to acoustic devices,could interact and be analogous to fertilize fantastic new ideas and prototype devices,which might find applications in acoustic engineering and noisevibration control engineering in the near future.

关键词： acoustic materials robust propagation topological acoustic metamaterials topological phases

High-performance bifunctional polarization switch chiral metamaterials by inverse design method

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npj Computational Materials 2019年第1期5卷 324-331页

作者： Chuanbao Liu Yang Bai Ji Zhou Qian Zhao Yihao Yang Hongsheng Chen Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Environmental Fracture(Ministry of Education) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100084China State Kay Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory for Modern Optical Instrumentation Zhejiang UniversityHangzhou 310027China

Multifunctional polarization controlling plays an important role in modern photonics,but their designs toward broad bandwidths and high efficiencies are still rather ***,by applying the inverse design method of model-based theoretical paradigm,we design cascaded chiral metamaterials for different polarization controls in oppositely propagating directions and demonstrate their broadband and high-efficiency performance theoretically and *** with the derivation of scattering matrix towards specified polarization control,a chiral metamaterial is designed as a meta-quarter-wave plate for the forward propagating linearly polarized wave,which converts the x-or y-polarized wave into a nearly perfect left-or right-handed circularly polarized wave;intriguingly,it also serves as a 45°polarization rotator for the backward propagating linearly polarized *** bifunctional metamaterial shows a high transmission as well as a broad bandwidth due to the Fabry–Perot-like interference *** the similar approach,an abnormal broadband meta-quarter-wave plate is achieved to convert the forward x-and y-polarized or the backward y-and x-polarized waves into left-and right-handed circularly polarized waves with high transmission *** integration of multiple functions in a single structure endows the cascaded chiral metamaterials with great interests for the high-efficiency polarization-controlled applications.

关键词： chiral polarized inverse

Observation of fractal higher-order topological states in acoustic metamaterials

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Science Bulletin 2022年第20期67卷 2069-2075,M0004页

作者： Shengjie Zheng Xianfeng Man Ze-Lin Kong Zhi-Kang Lin Guiju Duan Ning Chen Dejie Yu Jian-Hua Jiang Baizhan Xia State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China College of mechanical and Electrical Engineering Changsha UniversityChangsha 410022China Institute of Theoretical and Applied Physics School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215006China

Topological phases of matter have been extensively investigated in solid-state materials and classical wave systems with integer dimensions. However, topological states in non-integer dimensions remain almost unexplored. Fractals, being self-similar on different scales, are one of the intriguing complex geometries with non-integer dimensions. Here, we demonstrate fractal higher-order topological states with unprecedented emergent phenomena in a Sierpin? ski acoustic metamaterial. We uncover abundant topological edge and corner states in the acoustic metamaterial due to the fractal geometry. Interestingly,the numbers of the edge and corner states depend exponentially on the system size, and the leading exponent is the Hausdorff fractal dimension of the Sierpin? ski carpet. Furthermore, the results reveal the unconventional spectrum and rich wave patterns of the corner states with consistent simulations and experiments. This study thus unveils unconventional topological states in fractal geometry and may inspire future studies of topological phenomena in non-Euclidean geometries.

关键词： Higher-order topological states Topological fractals Sierpinski carpet Fractal dimensions Acoustic metamaterials

Hyperbolic metamaterials: fusing artificial structures to natural 2D materials

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eLight 2022年第1期2卷 1-23页

作者： Dasol Lee Sunae So Guangwei Hu Minkyung Kim Trevon Badloe Hanlyun Cho Jaekyung Kim Hongyoon Kim Cheng‑Wei Qiu Junsuk Rho Department of mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Biomedical Engineering Yonsei UniversityWonju 26493Republic of Korea Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea.

Optical metamaterials have presented an innovative method of manipulating *** metamaterials have an extremely high anisotropy with a hyperbolic dispersion *** are able to support high-k modes and exhibit a high density of states which produce distinctive properties that have been exploited in various applications,such as super-resolution imaging,negative refraction,and enhanced emission ***,state-of-the-art hyperbolic metamaterials are reviewed,starting from the fundamental principles to applications of artificially structured hyperbolic media to suggest ways to fuse natural two-dimensional hyperbolic *** review concludes by indicating the current challenges and our vision for future applications of hyperbolic metamaterials.

关键词： Hyperbolic metamaterials High resolution optical imaging Nanoscale lithography Light propagation and manipulation Spontaneous emission engineering Natural 2D materials

Super-resolution acoustic image montage via a biaxial metamaterial lens

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Science Bulletin 2020年第12期65卷 1022-1029,M0004页

作者： Yu-Gui Peng Ya-Xi Shen Zhi-Guo Geng Peng-Qi Li Jie Zhu Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China Research Center for Fluid-Structure Interactions Department of Mechanical Engineeringthe Hong Kong Polytechnic UniversityHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Photonics Initiative Advanced Science Research CenterCity University of New YorkNY 10031USA.

Ever since the Victorian era, montage, the process of pictorial composition made by juxtaposing or superimposing photographs, has been a very popular post-editing imaging technique. Despite showing a strong power in demonstrating complex wave field effects, this technique has neither been fully explored in acoustic imaging nor been realized in real-time systems with the capability beyond diffraction *** the other hand, the recent prospect of metamaterials has shown their great potentials in superresolution acoustic imaging. However, the miracle jigsaw of more advanced functional modulation of acoustic wave fields at deep subwavelength scale still remains elusive. Here we report the experimental implementation of super-resolution acoustic image montage through a judiciously designed biaxial metamaterial lens. Based on the non-diffraction birefringence in the biaxial metamaterials, we realized various montage functionalities such as duplication, composition, and decomposition of sound images with distinctive deep subwavelength features. Our work represents an important step in developing versatile functional acoustic metamaterial devices for imaging purposes, as it provides on-demand editing of sound field patterns beyond diffraction limits.

关键词： Acoustic metamaterials Super-resolution imaging Biaxial metamaterials Montage technique

Nacre-liked material with tough and post-tunable mechanical properties

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Journal of Materials Science & Technology 2022年第19期114卷 172-179页

作者： Zhengyi Mao Mengke Huo Fucong Lyu Yongsen Zhou Yu Bu Lei Wan Lulu Pan Jie Pan Hui Liu Jian Lu Department of mechanical Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina CityU-Shenzhen Futian Research Institute No.3Binglang RoadFutian DistrictShenzhen 518000China Department of Material Science Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong KongChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Laboratory of Nanomaterials&Nanomechanics City University of Hong KongHong KongChina

Biomaterials,often imparted time-dependent mechanical properties,which are promising in fields rang-ing from sensors to ***,a facile method was proposed to fabricate post-tunable mechanical properties composites based on hydrogels and ceramic *** wide tunable range of Young’s modulus(27.3 kPa to 3.5 GPa)and ultimate stress(173 kPa to 102 MPa)can be achieved by combining solvent absorption and evaporation process with platelets reinforcement ***,a large fracture toughness(∼32,000 J m^(-2))is obtained as a result of the nacre-liked“brick and mortar”structure introduced by shear force during *** superior flexibility and designability of this material were demonstrated via actuators,portable structure,and *** all,this study provides a new thought to fabricate tough materials with post-tunable mechanical properties.

关键词： mechanical property Post-tunable Hydrogels Fracture toughness

Microfluidic integrated metamaterials for active terahertz photonics

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Photonics Research 2019年第12期7卷 1400-1406页

作者： ZHANG ZHANG JU GAO MAOSHENG YANG XIN YAN YUYING LU LIANG WU JINING LI DEQUAN WEI LONGHAI LIU JIANHUA XIE LANJU LIANG JIANQUAN YAO Key Laboratory of Opto-Electronics Information Technology Institute of Laser and Opto-ElectronicsCollege of Precision Instruments and OptoElectronics EngineeringTianjin UniversityTianjin 300072China School of Opto-Electronic Engineering Zaozhuang UniversityZaozhuang 277160China Department of Physics The University of Hong KongChina School of mechanical Engineering Jiangsu UniversityZhenjiang 212013China Advantest(China)Co. Ltd.Shanghai 201203China

A depletion layer played by aqueous organic liquids flowing in a platform of microfluidic integrated metamaterials is experimentally used to actively modulate terahertz(THz)*** polar configuration of water molecules in a depletion layer gives rise to a damping of THz *** parallel coupling of the damping effect induced by a depletion layer with the resonant response by metamaterials leads to an excellent modulation depth approaching 90%in intensity and a great difference over 210°in phase ***,a tunability of slow-light effect is *** time-frequency analysis performed by the continuous wavelet transforms reveals the consumed energy with varying water content,indicating a smaller moment of inertia related to a shortened relaxation time of the depletion *** work,as part of THz aqueous photonics,diametrically highlights the availability of water in THz devices,paving an alternative way of studying THz wave–liquid interactions and developing active THz photonics.

关键词： depletion effect fluid

General deep learning framework for emissivity engineering

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Light(Science & Applications) 2023年第12期12卷 2755-2767页

作者： Shilv Yu Peng Zhou Wang Xi Zihe Chen Yuheng Deng Xiaobing Luo Wangnan Li Junichiro Shiomi Run Hu School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053 HubeiChina Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone)Xiangyang 441000 HubeiChina Department of mechanical Engineering The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8654Japan

Wavelength-selective thermal emitters(WS-TEs)have been frequently designed to achieve desired target emissivity spectra,as a typical emissivity engineering,for broad applications such as thermal camouflage,radiative cooling,and gas sensing,***,previous designs require prior knowledge of materials or structures for different applications and the designed WS-TEs usually vary from applications to applications in terms of materials and structures,thus lacking of a general design framework for emissivity engineering across different ***,previous designs fail to tackle the simultaneous design of both materials and structures,as they either fix materials to design structures or fix structures to select suitable ***,we employ the deep Q-learning network algorithm,a reinforcement learning method based on deep learning framework,to design multilayer *** demonstrate the general validity,three WS-TEs are designed for various applications,including thermal camouflage,radiative cooling and gas sensing,which are then fabricated and *** merits of the deep Q-learning algorithm include that it can(1)offer a general design framework for WS-TEs beyond one-dimensional multilayer structures;(2)autonomously select suitable materials from a self-built material library and(3)autonomously optimize structural parameters for the target emissivity *** present framework is demonstrated to be feasible and efficient in designing WS-TEs across different applications,and the design parameters are highly scalable in materials,structures,dimensions,and the target functions,offering a general framework for emissivity engineering and paving the way for efficient design of nonlinear optimization problems beyond thermal metamaterials.

关键词： framework multilayer autonomous