Photoexcited Blueshift and Redshift Switchable Metamaterial Absorber at Terahertz Frequencies

被引：0

作者：

续宗成 ^{[1
,2
]}

吴亮 ^{[2
]}

张雅婷 ^{[2
]}

徐德刚 ^{[2
]}

姚建铨 ^{[2
]}

机构：

[1] Department of Physics Tianjin University Renai College

[2] Institute of Laser and Opto-electronics and Key Laboratory of Opto-electronics Information Science and Technology(Ministry of Education) Tianjin University

来源：

Chinese Physics Letters | 2019年 / 12期

关键词：

Photoexcited Blueshift and Redshift Switchable Metamaterial Absorber at Terahertz Frequencies;

D O I：

暂无

中图分类号：

TB34 [功能材料]; O441.4 [电磁波与电磁场];

学科分类号：

080501 ; 0809 ;

摘要：

We propose a design and numerical study of an optically blueshift and redshift switchable metamaterial(MM)absorber in the terahertz regime. The MM absorber comprises a periodic array of metallic split-ring resonators(SRRs) with semiconductor silicon embedded in the gaps of MM resonators. The absorptive frequencies of the MM can be shifted by applying an external pump power. The 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 variation. The optical-tuned absorber has potential applications as a terahertz modulator or switch.

引用

页码：32 / 35

页数：4