Light-Excited and Switchable Dual-Band Terahertz Metamaterial Absorber

被引：0

作者：

Yang, Sen ^{[1
]}

Yuan, Su ^{[2
]}

Wang, Jiayun ^{[2
]}

机构：

[1] Business College of Shanxi University, Taiyuan,030031, China

[2] School of Physics and Electronic Engineering, Shanxi University, Taiyuan,030006, China

来源：

Guangxue Xuebao/Acta Optica Sinica | 2021年 / 41卷 / 02期

关键词：

Absorption characteristics - Absorption mechanisms - Absorption state - Current distribution - Laser pumping - Metamaterial absorbers - Polarization-insensitive - Square rings;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In this paper, we propose a light-excited, dynamically switchable, dual-band terahertz metamaterial absorber based on a square ring-wire structure. By adjusting the insulation/conduction state of photosensitive silicon and germanium chips embedded in the gaps of the structure, the absorber can be switched freely between three dual-band perfect-absorption states without changing its structure. The results show that when there is no laser pumping, the absorber works in a dual-band absorption state at 0.987 THz and 1.767 THz; when using 800 nm laser pumping, it switches to dual-band absorption at 0.717 THz and 1.444 THz; and when using 1550 nm laser pumping, it switches to dual-band absorption at 0.716 THz and 1.767 THz. In addition, the three switchable dual-band absorption mechanism is explained from equivalent circuit, impedance matching and current distributions, and the polarization-insensitive absorption characteristics are discussed. © 2021, Chinese Lasers Press. All right reserved.

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