Transmission and reflection cloaking by using a zero-refractive-index photonic crystal in the microwave region

被引：1
|
作者：
Luo, Tianzi [1 ,2 ]
Li, Chenxia [1 ,3 ]
Gan, Haiyong [4 ]
Hong, Zhi [2 ]
Jing, Xufeng [1 ,2 ,5 ]
机构：
[1] China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Peoples R China
[2] China Jiliang Univ, Ctr THz Res, Hangzhou 310018, Peoples R China
[3] Hangzhou WOLIU Technol Co Ltd, Hangzhou, Peoples R China
[4] Natl Inst Metrol, Beijing, Peoples R China
[5] Hangzhou Hangxin Qihui Technol Co Ltd, Hangzhou, Peoples R China
来源：
APPLIED OPTICS | 2021年 / 60卷 / 24期
基金：
中国国家自然科学基金;
关键词：
INVISIBILITY CLOAKING; METAMATERIALS; PARAMETERS; CONVERSION;
D O I：
10.1364/AO.430234
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a rectangular column two-dimensional square lattice photonic crystal to realize zero refractive index. Through analysis of t he energy band structure of the photonic crystal structure, the lattice constant and side length of the rectangular columns can be optimized, and the Dirac cone dispersion appears at the center of the Brillouin zone. The Dirac cone is formed by the interaction of a monopolar eigenstate and a dipolar eigenstate to form a triple accidental degenerate state. The effective medium theory is used to invert the effective electromagnetic parameters of the photonic crystal with a double zero refractive index. The zero-phase change and the focusing characteristic of the concave lens of this kind of zero-refractive-index material are verified. Importantly, we have achieved transmission and reflection cloaking with this zero-index medium. Through the analysis of the amplitude and phase distribution characteristics of the electromagnetic field, it is proved that the designed cloaking devices have obvious cloaking effect. (C) 2021 Optical Society of America
引用
收藏
页码：7492 / 7499
页数：8
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