Responses of Fourier Transform-Surface Plasmon Resonance Frequency to Refractive Index of the Solution in Contact with the Gold Film

Abstract

By using the fourier transform-surface plasmon resonance(FT-SPR) technique,the FT-SPR responses(R) toward NaCl,KCl and ethanol with various aqueous concentrations were measured.A quantitative equation of R=1.53×105(n-1.3333) was set up for the response toward the concentration dependent solution refractive index(n).The result shows that the FT-SPR response of 15 cm-1 is obtained upon 0.0001 change in the refractive index.This equation is promising in direct measurement of refractive index of unknown media.