Reflection-type infrared biosensor based on surface plasmonics in graphene ribbon arrays  

作　　者：韦玮 农金鹏 汤林龙 张桂稳 蒋肖 朱永 

机构地区：[1]Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China,Chongqing University [2]College of Optoelectronic Engineering, Chongqing University [3]Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences [4]Chongqing Engineering Research Center of Graphene Film Manufacturing

出　　处：《Chinese Optics Letters》2015年第8期113-117,共5页中国光学快报（英文版）

基　　金：supported by National High Technology Research and Development Program of China(No.2015AA034801);the National Natural Science Foundation of China(No.61405021);the Specialized Research Fund for the Doctoral Program of Higher Education(No.20120191120021);the Natural Science Foundation of Chongqing,China(No.cstc2014jcyj A40045);the Fundamental Research Funds for the Central Universities(Nos.CDJZR12120004 and 106112013CDJZR120006)

摘　　要：We propose a reflection-type infrared biosensor by exploiting localized surface plasmons in graphene ribbon arrays. By enhancing the coupling between the incident light and the resonant system, an asymmetric Fabry-Pcrot cavity formed by the ribbons and reflective layer is employed to reshape the reflection spectra. Simulation results demonstrate that the reflection spectra can be modified to improve the figure of merit （FOM） significantly by adjusting the electron relaxation time of graphene, the length of the Fabry-Perot cavity, and the Fermi energy level. The FOM of such a biosensor can achieve a high value of up to 36/refractive index unit （36/RIU）, which is -4 times larger than that of the traditional transmission-type one. Our study offers a feasible approach to develop biosensing devices based on graphene plasmonics with high precision.We propose a reflection-type infrared biosensor by exploiting localized surface plasmons in graphene ribbon arrays. By enhancing the coupling between the incident light and the resonant system, an asymmetric Fabry-Pcrot cavity formed by the ribbons and reflective layer is employed to reshape the reflection spectra. Simulation results demonstrate that the reflection spectra can be modified to improve the figure of merit （FOM） significantly by adjusting the electron relaxation time of graphene, the length of the Fabry-Perot cavity, and the Fermi energy level. The FOM of such a biosensor can achieve a high value of up to 36/refractive index unit （36/RIU）, which is -4 times larger than that of the traditional transmission-type one. Our study offers a feasible approach to develop biosensing devices based on graphene plasmonics with high precision.

关 键 词：Biosensors Cavity resonators FABRY Perot interferometers Fiber optic sensors PLASMONS 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]