Switchable terahertz absorber based on metamaterial structure with photosensitive semiconductor

被引：16
|
作者：
Yang, Lei [1 ,2 ]
Wang, Hao [1 ]
Ren, Xudong [1 ,2 ]
Song, Xiaoxian [1 ]
Chen, Mingyang [1 ]
Tong, Yanqun [1 ]
Ye, Yunxia [1 ,3 ]
Ren, Yunpeng [1 ,3 ]
Liu, Shenyi [1 ]
Wang, Sibo [1 ]
Yin, Liang [1 ]
Yao, Jianquan [1 ,3 ,4 ]
机构：
[1] Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Jiangsu Yudi Opt Co Ltd, Nantong 226404, Peoples R China
[3] Jiangsu Univ, Inst Micronano Optoelect & Terahertz Technol, Zhenjiang 212013, Jiangsu, Peoples R China
[4] Tianjin Univ, Coll Precis Instruments & Optoelect Engn, Tianjin 300072, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2021年 / 485卷
关键词：
Terahertz metamaterial absorber; Switchable absorption peak; Photosensitive semiconductor;
D O I：
10.1016/j.optcom.2020.126708
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A terahertz absorber based on metamaterial is designed. The tunability of the absorber can be realized by employing photosensitive semiconductor material of GaAs. By adjusting the conductivity of GaAs through photo-excitation, the absorption peak shifts from 2.73 THz to 3.85 THz with full width at half maximum (FWHM) relative to the resonance frequency 4.4% and 21.4% respectively. Qualitative analyses are carried out on the electromagnetic responding modes with different perspectives. Physical mechanisms of the metamaterial absorber are construed with the split-ring resonators model at 2.73 THz and the oscillating conduction model at 3.85 THz. This switchable terahertz absorber owns a great potential in the applications such as optical switch, optical detection, optical coding and others.
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页数：5
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