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Optically-Controlled Terahertz Multifunctional Polarization Conversion Metasurface with Reflection and Transmission Modes

Authors :
Ying Tian
Lichang Han
Li Yan
Jiayun Wang
Binzhen Zhang
Zan Jiao
Source :
Micromachines, Vol 13, Iss 9, p 1387 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

In the terahertz band, how integrating multiple functions into a device with a tiny unit structure is a challenge. In this paper, an optically-controlled multifunctional linear polarization conversion metasurface working in the terahertz band is proposed. The reflection and transmission polarization conversion functions can be realized by irradiating the metasurface with pump light with different wavelengths. The metasurface is designed with a multilayer structure, and a photosensitive semiconductor alone is used to control multiple functions, which makes the manipulation of multifunctional devices easy. When the photosensitive semiconductor germanium (Ge) and silicon (Si) are in different states, the metasurface can realize broadband reflection and transmission polarization conversion functions, the corresponding relative bandwidth are 102.4% and 98.9%, respectively, and the work efficiency can be regulated by pump light with different intensity and wavelength. In addition, the working principle of the metasurface is analyzed by eigenmode theory and surface current distributions. The stability of the metasurface to structural parameters and incident angles are discussed.

Details

Language :
English
ISSN :
13091387 and 2072666X
Volume :
13
Issue :
9
Database :
Directory of Open Access Journals
Journal :
Micromachines
Publication Type :
Academic Journal
Accession number :
edsdoj.77c2bc2e854f447d81c951fc0e7ff1bc
Document Type :
article
Full Text :
https://doi.org/10.3390/mi13091387