Ultracompact Refractive Index Sensor Based on Surface-Plasmon-Polariton Interference  

作　　者：WANG Chen CHEN Jian-Jun TANG Wei-Hua XIAO Jing-Hua 王晨;陈建军;唐为华;肖井华(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876;School of Science,Beijing University of Posts and Telecommunications,Beijing 100876)

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876 [2]School of Science,Beijing University of Posts and Telecommunications,Beijing 100876

出　　处：《Chinese Physics Letters》2012年第12期192-195,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11204018,61177085,51172030;the National Basic Research Program of China under Grant No 2010CB923200.

摘　　要：Using an ultracompact groove-slit-groove(GSG)structure,a refractive index sensor with a broadband response is proposed and experimentally demonstrated.Due to the interference of surface plasmon polaritons(SPPs),the transmission spectra in the GSG structure exhibit oscillation behaviors in a broad bandwidth,and they are quite sensitive to the refractive index of the surroundings.Based on the principle,the characteristics of its refractive index sensing are demonstrated experimentally.In the experiment,the structure is illuminated with a bulk light source(not a tightly focused light source)from the back side.This decreases the difficulty of the experimental measurement and can protect strong light sources from damaging the detection samples.Meanwhile,the whole structure of the sensor can be made more ultracompact without considering the influence of the incident waves.

关 键 词：refractive COMPACT STRUCTURE 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]