NDLI: Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

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Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

Content Provider	MDPI
Author	Yu, Dingwang Dong, Yanfei Ruan, Youde Li, Guochao Li, Gaosheng Ma, Haomin Deng, Song Liu, Zhenpeng
Copyright Year	2021
Description	In this paper, a photo-excited switchable terahertz metamaterial (MM) polarization converter/absorber has been presented. The switchable structure comprises an orthogonal double split-ring resonator (ODSRR) and a metallic ground, separated by a dielectric spacer. The gaps of ODSRR are filled with semiconductor photoconductive silicon (Si), whose conductivity can be dynamically tuned by the incident pump beam with different power. From the simulated results, it can be observed that the proposed structure implements a wide polarization-conversion band in 2.01–2.56 THz with the conversion ratio of more than 90% and no pump beam power incident illuminating the structure, whereas two absorption peaks operate at 1.98 THz and 3.24 THz with the absorption rates of 70.5% and 94.2%, respectively, in the case of the maximum pump power. Equivalent circuit models are constructed for absorption states to provide physical insight into their operation. Meanwhile, the surface current distributions are also illustrated to explain the working principle. The simulated results show that this design has the advantage of the switchable performance afforded by semiconductor photoconductive Si, creating a path towards THz imaging, active switcher, etc.
Starting Page	1116
e-ISSN	20734352
DOI	10.3390/cryst11091116
Journal	Crystals
Issue Number	9
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-09-14
Access Restriction	Open
Subject Keyword	Crystals Industrial Engineering Metamaterial Polarization Converter/absorber Switcher Photoconductive Silicon Thz Wave Orthogonal Double Split-ring Resonator
Content Type	Text
Resource Type	Article

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