Realization of broadband terahertz reflector by all-dielectric monolayer grating

被引：0

作者：

Fang, Bo ^{[1
]}

Han, Shuang ^{[2
]}

Xie, Jingwen ^{[2
]}

Li, Chenxia ^{[2
]}

Hong, Zhi ^{[3
]}

Jing, Xufeng ^{[2
,3
]}

机构：

[1] China Jiliang Univ, Coll Metrol & Measurement Engn, Hangzhou 310018, Zhejiang, Peoples R China

[2] China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Zhejiang, Peoples R China

[3] China Jiliang Univ, Ctr THz Res, Hangzhou 310018, Zhejiang, Peoples R China

来源：

OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS | 2019年 / 13卷 / 3-4期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Grating; Reflector; Terahertz;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We exploit Mie resonances in all-dielectric grating metamaterials to design a single-negative all-dielectric near-perfect reflector. The average reflection over 99.9% at single frequency in terahertz region is achieved. Ultrabroadband perfect reflector was proposed by all dielectric single-layer super cell grating metamaterial structure. It consists of two Silicon grating strips with different width in single unit cell, which possesses peak reflection over 99.9% and a near-perfect reflection band of 0.79THz from 1.19THz to 1.98THz, surpassing the reflectance of metallic mirrors. The coupling effect of Si grating elements with different width is revealed by magnetic and electric dipole Mie resonances. The physic mechanism of broadband perfect reflection is disclosed by the electromagnetic field distribution of super cell grating. Polarization effect of perfect reflection is also studied. The proposed super cell metamaterial structure can be potentially applied to other photonic devices to realize broadband effect.

引用

页码：175 / 181

页数：7

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