Limitation of the electromagnetic cloak with dispersive material

被引：34

作者：

Yao, Peijun ^{[1
]}

Liang, Zixian ^{[1
]}

Jiang, Xunya ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 03期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2814039

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Based on causality, the limitation of the electromagnetic cloak with dispersive material is investigated in this letter. The results show that perfect invisibility cannot be achieved because of the dilemma that either the group velocity V-g diverges or a strong absorption is imposed on the cloaking material. It is an intrinsic conflict which originates from the demand of causality. However, the total cross section can really be reduced through the approach of coordinate transformation. A simulation of finite-difference time-domain method is performed to validate our analysis.

引用

页数：3

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