Ultrawide dynamic modulation of perfect absorption with a Friedrich–Wintgen BIC  

作　　者：ENDUO GAO RONG JIN ZHENCHU FU GUANGTAO CAO YAN DENG JIAN CHEN GUANHAI LI XIAOSHUANG CHEN HONGJIAN LI 

机构地区：[1]School of Physics and Electronics,Central South University,Changsha 410083,China [2]State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China [3]School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410004,China [4]School of Physics and Chemistry,Hunan First Normal University,Changsha 410205,China [5]Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China

出　　处：《Photonics Research》2023年第3期456-462,共7页光子学研究（英文版）

基　　金：Hunan Provincial Innovation Foundation for Postgraduate(1053320200208);Shanghai Municipal Science and Technology Major Project(2019SHZDZX01);Science and Technology Commission of Shanghai Municipality(20JC1416000,22JC1402900);Shanghai Rising-Star Program(20QA1410400);Natural Science Foundation of Zhejiang Province(LR22F050004);Strategic Priority Research Program of Chinese Academy of Sciences(XDB43010200);Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y2021070);National Natural Science Foundation of China(61865006,61875218,62222514,91850208);National Key Research and Development Program of China(2018YFA0306200)。

摘　　要：Dynamical control of perfect absorption plays an indispensable role in optical switch and modulators.However,it always suffers from the limited modulation range,small depth,and susceptible absorption efficiencies.Here,we propose a new strategy based on Friedrich–Wintgen bound states in the continuum(F–W BICs)to realize a tunable perfect absorber with large dynamic modulation range.For proof of concept,we demonstrate a pentaband ultrahigh absorption system consisting of graphene gratings and graphene sheets through elaborately tuning F–W BIC.The nature of the F–W BIC arises from the destructive interference between Fabry–Perot resonance and guided mode resonance modes in the coherent phase-matching condition.The radiation channels are avoided from crossing.The BIC can be dynamically modulated by engineering the Fermi level of graphene gratings,which breaks the traditional modulation methods with an incidence angle.Remarkably,the perfect absorber with this F–W BIC approach achieves the largest modulation range of up to 3.5 THz.We believe that this work provides a new way to dynamically engineer perfect absorption and stimulates the development of multiband ultracompact devices.

关 键 词：tuning ABSORPTION PERFECT 

分 类 号：O43[机械工程—光学工程]