Index sensing characteristics of the plasmonic sensor based on metal-insulator-metal waveguide-coupled structure  

作　　者：郭健平 朱家胡 黄旭光 

机构地区：[1]Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University [2]School of Physics and Telecommunication Engineering, South China Normal University

出　　处：《Optoelectronics Letters》2013年第5期321-324,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61275059);the Excellent Young Teachers Program of South China Normal University(No.2012KJ002);the "973" Project(No.2011CBA00200)

摘　　要：A plasmonic refractive index sensor based on metal-insulator-metal(MIM) waveguide-coupled structure is proposed and demonstrated in this paper.The physical mechanism of the device is deduced,and the finite difference time domain(FDTD) method is employed to simulate and study its index sensing characteristics.Both analytic and simulated results show that the resonant wavelength of the sensor has a linear relationship with the refractive index of material under sensing.Based on the relationship,the refractive index of the material can be obtained from the detection of the resonant wavelength.The results show that the sensitivity of the sensor can exceed 1600 nm/RIU,and it can be used in chemical and biological detections.A plasmonic refractive index sensor based on metal-insulator-metal （MIM） waveguide-coupled structure is proposed and demonstrated in this paper. The physical mechanism of the device is deduced, and the finite difference time do- main （FDTD） method is employed to simulate and study its index sensing characteristics. Both analytic and simulated results show that the resonant wavelength of the sensor has a linear relationship with the refractive index of material under sensing. Based on the relationship, the refractive index of the material can be obtained from the detection of the resonant wavelength. The results show that the sensitivity of the sensor can exceed 1600 nm/RIU, and it can be used in chemical and biological detections.

关 键 词：金属波导 表面等离子体激元 传感特性 耦合结构 传感器 绝缘体 传感材料 生物检测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN25[自动化与计算机技术—控制科学与工程]