Ultra-wideband and Multifunctional Metamaterial Polarization Rotator in Terahertz Band

被引：13
作者：
Miao, Xiang [1 ,2 ]
Xiao, Zhongyin [1 ,2 ]
Cui, Zhentao [1 ,2 ]
Zheng, Tiantian [1 ,2 ]
Wang, Xiaoyu [1 ,2 ]
机构：
[1] Shanghai Univ, Sch Commun & Informat Engn, Key Lab Specialty Fiber Opt & Opt Access Networks, Shanghai, Peoples R China
[2] Shanghai Univ, Sch Commun & Informat Engn, Shanghai Inst Adv Commun & Data Sci, Shanghai, Peoples R China
来源：
PLASMONICS | 2022年 / 17卷 / 04期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
Ultra-wideband; Polarization converter; Terahertz; I"-shaped resonator; CONVERSION; CONVERTER;
D O I：
10.1007/s11468-022-01621-y
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, a reflective polarization convertor is proposed based on a sandwich structure consisting of an "I"-shaped resonator at the top, a medium layer of foam, and a metal layer at the bottom. The characteristics of ultra-wideband (UWB) and higher relative bandwidth (RB) have been achieved than previous structures. The structure effectively controls the polarization of electromagnetic waves in the terahertz band, which convert the incident linear-polarized (LP) wave to cross-polarized wave within 2.75-10.35THz, with a relative bandwidth of 116% and a polarization conversion ratio (PCR) greater than 90%. In addition, this structure also converts the incident linear-polarized wave to circular-polarized wave in the range of 2.28-2.65THz with axial ratio (AR) less than 3 dB. The characteristics are also analyzed based on the surface current distribution. The reason of realizing UWB polarization conversion is explained by polarization decomposition method. Our structure could provide many potential applications in radar antenna, metamaterial lens, and other electromagnetic wave and optical fields.
引用
收藏
页码：1379 / 1386
页数：8
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