Reflex optical sensor based on dual metal gratings with high angular sensitivity  

作　　者：许吉 程晨 白强 陈璟 丁剑平 

机构地区：[1]Nanjing National Laboratory of Microstructures and School of Physics, Nanjing University [2]School of Physics and Key Laboratory of Weak Light Nonlinear Photonics, Nankai University [3]State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences

出　　处：《Chinese Optics Letters》2011年第6期17-20,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 10974102, 10874078,11074116, and 10934003);the National Basic Research Program of China (No. 2006CB921805);the Open Project of the State Key Laboratory of Functional Materials for Informatics

摘　　要：An interesting reflection phenomenon in a dual metal grating （DMG） structure is studied, which is related to the competition between Fabry-Prot （F-P） resonance effect and evanescent-field coupling effect inside the gap between the two composing single metal gratings. This competition leads to high angular sensitivity in response to the refractive index variation of the sample solution in the gap. A reflex optical sensor with high sensitivity based on DMG for detecting the change in refractive index is proposed and its performance theoretically is discussed.An interesting reflection phenomenon in a dual metal grating （DMG） structure is studied, which is related to the competition between Fabry-Prot （F-P） resonance effect and evanescent-field coupling effect inside the gap between the two composing single metal gratings. This competition leads to high angular sensitivity in response to the refractive index variation of the sample solution in the gap. A reflex optical sensor with high sensitivity based on DMG for detecting the change in refractive index is proposed and its performance theoretically is discussed.

关 键 词：COMPETITION Diffraction gratings Light refraction Optical sensors Refractive index REFRACTOMETERS 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]