Extremely angle-stable transparent window for TE-polarized waves empowered by anisotropic metasurfaces

被引：4

作者：

Chu, Zuntian ^{[1
]}

Li, Tiefu ^{[1
]}

Wang, Jiafu ^{[1
]}

Jiang, Jinming ^{[1
]}

Zhang, Zhongtao ^{[1
]}

Zhu, Ruichao ^{[1
]}

Jia, Yuxiang ^{[1
]}

Gui, Boheng ^{[1
]}

Zhang, Hong ^{[1
]}

Qu, Shaobo ^{[1
]}

机构：

[1] Air Force Engn Univ, Shananxi Key Lab Artificially Struct Funct Mat &, Xian 710051, Shaanxi, Peoples R China

来源：

OPTICS EXPRESS | 2022年 / 30卷 / 11期

基金：

中国国家自然科学基金;

关键词：

FREQUENCY-SELECTIVE SURFACE; IMPEDANCE;

D O I：

10.1364/OE.453058

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Impedance mismatch generally exists upon interfaces between different media. This is especially true for TE-polarized waves with large incident angles since there is no Brewster effect. As a result, high-efficiency transmission can only be guaranteed within limited incident angle range. It is desirable that transparent windows possess robust angle-stability. In this work, we propose a strategy of realizing transparent windows with extreme angle-stability using anisotropic metasurfaces. Different from traditional isotropic materials, anisotropic metasurfaces require specific three-dimensional permittivity and permeability parameters. Theoretical formulas are derived to realize a highly efficient transmission response without angular dispersion. To validate our design concept, a two-layer cascaded electromagnetic anti-reflector is designed, and it exhibits a characteristic impedance matching for nearly all incidence angles under TE-polarization illumination. As a proof-of-concept, a prototype of extremely angle-stable transparent window is fabricated and measured. Compared with the pure dielectric plate, the reflection coefficients are on average reduced by 40% at 13.5 GHz for TE-polarized waves from 0 degrees to 80 degrees. Therefore, we think, anisotropic cascaded electromagnetic transparent windows are capable of tailoring the electromagnetic parameter tensors as desired, and provide more adjustable degrees of freedom for manipulating electromagnetic wavefronts, which might open up a promising way for electromagnetic antireflection and find applications in radomes, IR windows and others. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

引用

页码：19999 / 20013

页数：15

共 55 条

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