Open AccessEnhancement of bandwidth and angle response of metasurface cloaking through adding antireflective moth-eye-like microstructure
Author(s) -
Xufeng Jing,
Chengfei Chu,
Chenxia Li,
Haitao Gan,
Yingwei He,
Xincui Gui,
Zhi Hong
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.021766
Subject(s) - cloaking , optics , bandwidth (computing) , wavefront , metamaterial , terahertz radiation , refractive index , radar , materials science , transformation optics , scattering , optoelectronics , physics , computer science , telecommunications
Ultrathin metasurface provides a completely new path to realize cloaking devices on account of their fascinating ability to control electromagnetic wave. However, the conventional cloaking devices are limited by their narrow bandwidth. To overcome this challenge, we present the realization of ultrabroadband and wide angle metasurface cloaking through high refractive index dielectric layer and antireflective "moth-eye-like" microstructure in this work. Two options are proposed and demonstrated numerically in terahertz region. By using local phase compensation, the proposed carpet cloaks can suppress significantly the unexpected scattering and reconstruct wavefront. The cloaking effects of the proposed design are verified from 0.65THz to 0.9THz with a wide range of angles. Moreover, the proposed metasurface cloaking is probable to extend to the optical and microwave domains and can be applied in stealth, illusion optic, radar and antenna systems.