Open AccessDesign of two invisibility cloaks using transmissive and reflective metamaterial-based multilayer frame microstructures
Author(s) -
Xufeng Jing,
Dantian Feng,
Ying Tian,
Meng Li,
Chengfei Chu,
Chenxia Li,
Yingwei He,
Haitao Gan,
Zhi Hong
Publication year - 2020
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.409137
Subject(s) - metamaterial , cloaking , cloak , optics , metamaterial cloaking , transformation optics , physics , metamaterial absorber , reflection (computer programming) , electromagnetic radiation , computer science , tunable metamaterials , programming language
Ultrathin metamaterials provide new possibilities for the realization of cloaking devices because of their ability to control electromagnetic waves. However, applications of metamaterials in cloaking devices have been limited primarily to reflection-type carpet cloaks. Hence, a transmissive free-space cloak was developed using a multilayer frame structure, wherein highly transparent metamaterials were used to guide incident waves into propagating around an object. The cloaking effect was quantitatively verified using near-field and far-field distributions. Metamaterials allow for the cloaking shells of transmissive cloaks to be developed without spatially varying extreme parameters. Moreover, a transmissive invisible cloak with metamaterial-based mirrors was designed. The design principle of this cloak with a frame structure consists of four metamaterial-based mirrors and two metal mirrors. After covered with the designed metamaterials-based mirrors cloak, the outgoing electromagnetic wave is restored greatly as if the wave passes directly through the obstacle without distortion. This cloak used the metamaterials mirrors to adjust the reflected angle, so that the outgoing electromagnetic wave does not change direction, thereby achieving the cloaking effect.