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Topology-empowered membrane devices for terahertz photonics

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

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Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial

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Microsystems & Nanoengineering 2017年第1期3卷 169-174页

作者： Mingkai Liu Mohamad Susli Dilusha Silva Gino Putrino Hemendra Kala Shuting Fan Michael Cole Lorenzo Faraone Vincent P.Wallace Willie J.Padilla David A.Powell ilya V.shadrivov Mariusz Martyniuk Nonlinear Physics Centre Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia School of Electrical Electronic and Computer Engineeringthe University of Western AustraliaCrawleyWA 6009Australia School of Physics University of Western AustraliaCrawleyWA 6009Australia Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA

The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and *** on the strong position sensitivity of metamaterials’electromagnetic response,we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven *** design maximizes the tunability range for small mechanical displacements of the *** employ a micro-electromechanical system technology and successfully fabricate the *** prototype devices are among the best-performing tunable THz absorbers demonstrated to date,with an ultrathin device thickness(~1/50 of the working wavelength),absorption varying between 60%and 80%in the initial state when the membranes remain suspended,and fast switching speed(~27μs).The absorption is tuned by an applied voltage,with the most marked results achieved when the structure reaches the snap-down *** this case,the resonance shifts by >200% of the linewidth(14% of the initial resonance frequency),and the absolute absorption modulation measured at the initial resonance can reach 65%.The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology.

关键词： absorber metamaterials micro-electro-mechanical system terahertz tunable device

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