Resonant perfect absorption of molybdenum disulfide beyond the bandgap  

作　　者：于昊 谢颖 魏佳辉 张培晴 崔志英 于浩海 Hao Yu;Ying Xie;Jiahui Wei;Peiqing Zhang;Zhiying Cui;Haohai Yu(Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province,Ningbo University,Ningbo 315211,China;Ningbo Yongxin Optics,Co.,Ltd.,Ningbo 315211,China;State Key Laboratory of Crystal Materials and Institute of Crystal Materials,Shandong University,Jinan 250100,China)

机构地区：[1]Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province,Ningbo University,Ningbo 315211,China [2]Ningbo Yongxin Optics,Co.,Ltd.,Ningbo 315211,China [3]State Key Laboratory of Crystal Materials and Institute of Crystal Materials,Shandong University,Jinan 250100,China

出　　处：《Chinese Physics B》2023年第4期670-676,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.62105169);Natural Science Foundation of Ningbo(Grant No.2021J078);Special fund for Talents Project of Ningbo University(Grant No.432094940)。

摘　　要：Light absorption and radiation are fundamental processes in optical science and engineering.Materials with perfect absorption properties play an important role in numerous optical applications.Following the meteoric rise of MoS_(2)material,global opportunities and challenges coexist due to its extremely weak light-matter interaction capability beyond its energy band.In this work,we designed a kind of sandwich resonance structure and investigated MoS_(2)as a perfect absorber in the infrared spectrum that should be transparent according to the optical band theory.The infrared absorption properties of W or Au/MoS_(2)/Au models at 800 nm-2400 nm were systematic simulated.By optimizing the structural parameters,the resonant wavelength of perfect absorption can be modulated from 830 nm to 1700 nm with angle insensitivity and polar independence.Moreover,we discovered that the bandwidth of absorption exceeding 50%of the W-top model reaches500 nm,while that of the Au-top model is less than 100 nm,indicating that the top metal material has a great influence on the resonance absorption spectrum.Our work provides a practical route for enhancing and manipulating the light-matter interactions of low-dimensional materials beyond their own band gaps,which will be critical in the future design and implementation of optoelectronic devices and systems.

关 键 词：multilayer MoS_(2) Fabry-Perot structure infrared absorption resonance enhancement 

分 类 号：TQ136.12[化学工程—无机化工]