Directional excitation of surface plasmon polaritons in structure of subwavelength metallic holes

被引：6

作者：

He, Meng-Dong ^{[1
]}

Liu, Jian-Qiang ^{[2
]}

Gong, Zhi-Qiang ^{[1
]}

Li, Shui ^{[1
]}

Luo, Yong-Feng ^{[1
]}

机构：

[1] Cent S Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China

[2] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2012年 / 285卷 / 02期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Surface plasmon polaritons; Directional excitation; Subwavelength metallic holes; OPTICAL-TRANSMISSION; WAVE SPLITTER; REAL METAL; GRATINGS; APERTURE;

D O I：

10.1016/j.optcom.2011.09.020

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, we propose a structure formed by two subwavelength holes fabricated in a metal film to realize directional excitation of surface plasmon polaritons (SPPs). The holes are employed as SPP sources, and the relative phase of SPPs generated at the hole exit end can be adjusted by changing the dielectric material filled in holes. Using the difference in relative phase values of SPP for two holes filled with different dielectric media, the SPPs can interfere constructively along one direction while destructively along the opposite direction. Our theoretical analysis is verified by the three-dimensional finite-difference time-domain method. Moreover, the directional excitation of SPPs in two-hole array structure is also discussed. It is found that the effect of SPPs directional excitation is improved with the increase of the number of two-hole. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：182 / 185

页数：4

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