金膜中单个亚波长孔的光与表面等离子体激元的耦合效率。

Coupling efficiency of light to surface plasmon polariton for single subwavelength holes in a gold film.

作者信息

Baudrion Anne-Laure, de Léon-Pérez Fernando, Mahboub Oussama, Hohenau Andreas, Ditlbacher Harald, García-Vidal Francisco J, Dintinger José, Ebbesen Thomas W, Martin-Moreno Luis, Krenn Joachim R

机构信息

Karl-Franzens University and Erwin Schrödinger Institute for Nanoscale Research, A-8010 Graz,

出版信息

Opt Express. 2008 Mar 3;16(5):3420-9. doi: 10.1364/oe.16.003420.

DOI:10.1364/oe.16.003420

PMID:18542433

Abstract

The excitation of surface plasmon polaritons (SPP) by focusing a laser beam on single subwavelength holes opened in a thin gold film is studied both experimentally and theoretically. By means of leakage radiation microscopy, quantitative measurements of the light-SPP coupling efficiency are performed for holes with different sizes and shapes. The system is studied theoretically by using a modal expansion method to calculate the fraction of the incident energy which is scattered by the hole into a surface plasmon. We demonstrate that a single subwavelength hole can be used to generate SPP with an efficiency up to 28%.

摘要

通过将激光束聚焦在薄金膜上开设的单个亚波长孔上，对表面等离激元极化激元（SPP）的激发进行了实验和理论研究。借助泄漏辐射显微镜，对不同尺寸和形状的孔进行了光-SPP耦合效率的定量测量。通过使用模态展开方法计算被孔散射到表面等离激元中的入射能量分数，对该系统进行了理论研究。我们证明，单个亚波长孔可用于产生效率高达28%的SPP。