Manipulating light transmission and absorption via an achromatic reflectionless metasurface  

作　　者：Xiaoying Zheng Jing Lin Zhuo Wang Haoyang Zhou Qiong He Lei Zhou 

机构地区：[1]State Key Laboratory of Surface Physics,Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Department of Physics,Fudan University,200433 Shanghai,People’s Republic of China [2]Academy for Engineering and Technology,Fudan University,200433 Shanghai,People’s Republic of China [3]Collaborative Innovation Center of Advanced Microstructures,210093 Nanjing,People’s Republic of China

出　　处：《PhotoniX》2023年第1期637-651,共15页智汇光学（英文）

基　　金：National Key Research and Development Program of China(No.2017YFA0700201);National Natural Science Foundation of China(No.11734007,No.12221004,No.62192771);Natural Science Foundation of Shanghai(No.20JC1414601);China Postdoctoral Science Foundation(No.2021 M690710).

摘　　要：Freely switching light transmission and absorption via an achromatic reflectionless screen is highly desired for many photonic applications(e.g.,energy-harvesting,cloaking,etc.),but available meta-devices often exhibit reflections out of their narrow working bands.Here,we rigorously demonstrate that an optical metasurface formed by two resonator arrays coupled vertically can be perfectly reflectionless at all frequencies below the first diffraction mode,when the near-field(NF)and far-field(FF)couplings between two constitutional resonators satisfy certain conditions.Tuning intrinsic loss of the system can further modulate the ratio between light transmission and absorption,yet keeping reflection diminished strictly.Designing/fabricating a series of metasurfaces with different inter-resonator configurations,we experimentally illustrate how varying inter-resonator NF and FF couplings can drive the system to transit between different phase regions in a generic phase diagram.In particular,we experimentally demonstrate that a realistic metasurface satisfying the discovered criteria exhibits the desired achromatic reflectionless property within 160-220 THz(0-225 THz in simulation),yet behaving as a perfect absorber at~203 THz.Our findings pave the road to realize meta-devices exhibiting designable transmission/absorption spectra immune from reflections,which may find many applications in practice.

关 键 词：Metasurfaces COUPLINGS Coupled-mode theory Kerker condition Perfect absorber 

分 类 号：TN751.2[电子电信—电路与系统]