基于反射光强度检测的棱镜SPR传感器  

Prism Surface Plasmon Resonance Sensor Based on Reflection Light Intensity Interrogation

作　　者：曾捷[1] 梁大开[1] 杜艳[1] 曾振武[1] 

机构地区：[1]南京航空航天大学智能材料与结构航空科技重点实验室,江苏南京210016

出　　处：《光电子．激光》2007年第2期159-163,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60477031;60535020);江苏省自然科学基金资助项目(BK2004128)

摘　　要：提出一种基于Kretschmann结构的新型棱镜表面等离子体波共振(SPR)传感方法。基于常规SPR角度检测系统,固定入射光角度,检测不同待测液体介质所对应的光强反射率,实现对液体相关性质的检测。通过建立理论模型和数值模拟,考察棱镜基体类型、金属薄膜介电常数和厚度、入射光波长等参数对SPR光强反射率的影响,进而提出耦合系数η用以衡量SPR效应强弱和变化趋势。此检测方法可省去常规角度调制系统中精密角度旋转装置,无需实时调整光探测器接收角度,并可根据需要动态调整检测范围。A novel surface plasmon wave resonance（SPR） sensor is presented. Based on resonance angle testing system,liquid medium characters are discussed by testing the light intensity reflectivities with the fix incident light angle. The influences of complex dielectric constant of metal film,prism type,wavelength and angle of incident light on the light intensity reflectivity are analyzed according to the theory model and numerical simulation. In addition, coupling coefficient, which can be used to estimate intensity and change trend of SPR effect,is also researched. This delection method can omit the precision angle rotation installation in the routine angle modulation,and it is not necessary to adjust the angle of light detector. Moreover,the sensor is capable of modulating dynamic detection scope according to the actual demand.

关 键 词：光强反射率 表面等离子体波共振(SPR) 棱镜结构 液体折射率 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]