Enhancing extraordinary transmission of light through a metallic nanoslit with a nanocavity antenna

被引：68

作者：

Cui, Yanxia ^{[1
,2
]}

He, Sailing ^{[1
,2
,3
]}

机构：

[1] Royal Inst Technol, Ctr Opt & Electromagnet Res, Joint Res Ctr Photon, Stockholm, Sweden

[2] Zhejiang Univ, Hangzhou, Zhejiang, Peoples R China

[3] Royal Inst Technol, Div Electromagnet Theory, Sch Elect Engn, S-10044 Stockholm, Sweden

来源：

OPTICS LETTERS | 2009年 / 34卷 / 01期

基金：

中国国家自然科学基金;

关键词：

EMISSION; FILMS;

D O I：

10.1364/OL.34.000016

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The extraordinary transmission of light through a vertical nanoslit in a metal film is enhanced by introducing a nanocavity antenna formed by a nearby metallic nanostrip over the slit opening. For a fixed wavelength, the width of the metallic nanostrip should be chosen to make the horizontal metal-insulator-metal waveguide of finite length resonant as a Fabry-Perot cavity. When such a cavity antenna is used to enhance the transmission through a nonresonant nanoslit, the slit should be opened at a position with a maximal magnetic field in the horizontal resonant cavity. It is shown that an optimized cavity antenna can enhance greatly the transmission of light through a nonresonant nanoslit (by about 20 times) or a resonant nanoslit (by 124%). Such a transmission enhancement with a nanocavity antenna is studied for the first time, and the physical mechanism is explained. (C) 2008 Optical Society of America

引用

页码：16 / 18

页数：3

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