Validity of effective medium theory for metal-dielectric lamellar gratings

被引：16

作者：

Kang, Xiu-Bao ^{[1
]}

Tan, Wei ^{[1
]}

Wang, Zhi-Guo ^{[1
]}

机构：

[1] Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2011年 / 284卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Effective medium theory; Metamaterials; Sub-wavelength grating; OPTICAL HYPERLENS; DIFFRACTION; LIMIT;

D O I：

10.1016/j.optcom.2011.05.001

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The effective medium theory (EMT) description of metal-dielectric lamellar gratings under transverse magnetic polarization is studied by the exact mode analysis method. It is demonstrated that, except a lower order eigenmode which can be approximated as the effective mode, there is a higher order eigenmode that cannot be described by the EMT. The resonant enhancement of the high order eigenmode induced by the coupling between the two kinds of eigenmodes leads to the failure of the EMT. In the presence of material absorption, the higher order eigenmode will be suppressed and thus the effective medium approximation becomes applicable. This result clarifies the fuzzy recognition about EMT. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：4237 / 4242

页数：6

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