Photoexcited Blueshift and Redshift Switchable Metamaterial Absorber at Terahertz Frequencies

作     者：Zong-Cheng Xu Liang Wu Ya-Ting Zhang De-Gang Xu Jian-Quan Yao 续宗成;吴亮;张雅婷;徐德刚;姚建铨

作者机构：Department of PhysicsTianjin University Renai CollegeTianjin 301636 Institute of Laser and Opto-electronics and Key Laboratory of Opto-electronies Information Science and Technology(Ministry of Education)Tianjin UniversityTianjin 300072 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2019年第36卷第12期

页      面：28-31页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：Supported by the National Key Research and Development Program of China under Grant No.2017YFA0700202 

主　　题：tuning modulator pump 

摘      要：We propose a design and numerical study of an optically blueshift and redshift switchable metamaterial(MM)absorber in the terahertz *** MM absorber comprises a periodic array of metallic split-ring resonators(SRRs)with semiconductor silicon embedded in the gaps of MM *** absorptive frequencies of the MM can be shifted by applying an external pump *** simulation results show that,for photoconductivity of silicon ranging between 1 S/m and 4000 S/m,the resonance peak of the absorption spectra shifts to higher frequencies,from 0.67 THz to 1.63 THz,with a resonance tuning range of 59%.As the conductivity of silicon increases,the resonance frequencies of the MM absorber are continuously tuned from 1.60 THz to 1.16 THz,a redshift tuning range of 28%.As the conductivity increases above 30000 S/m,the resonance frequencies tend to be stable while the absorption peak has a merely tiny *** optical-tuned absorber has potential applications as a terahertz modulator or switch.