Theoretical study of a refractive-index sensor based on directional coupling between metal-insulator-metal waveguides

被引：6

作者：

Luo, Li ^{[1
,3
]}

Feng, Guoying ^{[1
]}

Zhou, Shouhuan ^{[1
,2
]}

Tang, Tingting ^{[3
]}

机构：

[1] Sichuan Univ, Coll Elect & Informat Engn, Inst Laser & Micro Nano Engn, 29 Jiuyanqiao Wangjiang Rd, Chengdu 610064, Peoples R China

[2] North China Res Inst Electroopt, Beijing 100015, Peoples R China

[3] Chengdu Univ Informat Technol, Sichuan Prov Key Lab Informat Mat & Devices Appli, Chengdu 610225, Peoples R China

来源：

OPTIK | 2016年 / 127卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Refractive index sensor; Metal-insulator-metal; Surface plamon wave; Sensitivity (240.6680) Surface plasmons (230.7390) Planar waveguides (130.6010) Sensors;

D O I：

10.1016/j.ijleo.2015.11.106

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose a refractive sensor based on directional coupling between two metal-insulator-metal (MIM) waveguides to detect the sample refractive index. It consists of a metal-insulator-metal-insulator-metal (MIMIM) waveguide in which surface plasmon waves (SPW) are excited. The directional coupling properties are analyzed by coupled-mode theory. The expressions about the coupling coefficient, coupling length and sensitivity are deduced. Simulation results show the total size of our sensor with MIMIM waveguide is about one tenth that of dielectric waveguide, and the sensitivity is improved to ten times. (C) 2015 Elsevier GmbH. All rights reserved.

引用

页码：2149 / 2152

页数：4

共 15 条

[1] SURFACE-POLARITON-LIKE WAVES GUIDED BY THIN, LOSSY METAL-FILMS [J].