Dual-symmetry-perturbed all-dielectric resonant metasurfaces for high-Q perfect light absorption  

作　　者：葛俊洋 高一骁 徐雷 周宁 沈祥 Junyang Ge;Yixiao Gao;Lei Xu;Ning Zhou;Xiang Shen(Laboratory of Infrared Materials and Devices,Research Institute of Advanced Technologies,Ningbo University,Ningbo 315211,China;Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,Ningbo 315211,China;Advanced Optics&Photonics Laboratory,Department of Engineering,School of Science and Technology,Nottingham Trent University,Nottingham NG118NS,UK;School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;Ningbo Institute of Oceanography,Ningbo 315832,China)

机构地区：[1]Laboratory of Infrared Materials and Devices,Research Institute of Advanced Technologies,Ningbo University,Ningbo 315211,China [2]Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,Ningbo 315211,China [3]Advanced Optics&Photonics Laboratory,Department of Engineering,School of Science and Technology,Nottingham Trent University,Nottingham NG118NS,UK [4]School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China [5]Ningbo Institute of Oceanography,Ningbo 315832,China

出　　处：《Chinese Optics Letters》2024年第2期200-206,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62105172 and 62005236);the Zhejiang Provincial Natural Science Foundation(No.LQ21F050004);the Ningbo Natural Science Foundation(No.202003N4102);the K.C.Wong Magna Fund in Ningbo University。

摘　　要：We demonstrate a high-Q perfect light absorber based on all-dielectric doubly-resonant metasurface.Leveraging bound states in the continuum(BICs)protected by different symmetries,we manage to independently manipulate the Q factors of the two degenerate quasi-BICs through dual-symmetry perturbations,achieving precise matching of the radiative and nonradiative Q factors for degenerate critical coupling.We achieve a narrowband light absorption with a>600 Q factor and a>99%absorptance atλ_(0)=1550 nm on an asymmetric germanium metasurface with a 0.2λ_(0)thickness.Our work provides a new strategy for engineering multiresonant metasurfaces for narrowband light absorption and nonlinear applications.

关 键 词：resonant metasurface perfect light absorption bound states in the continuum 

分 类 号：O43[机械工程—光学工程]