STUDIES ON SURFACE-PLASMON RESONANCE SENSOR

Based on surface plasmon resonance(SPR), a novel optical chemical sens or was developed.. Traditionally SPR sensing method was to fix wavelen gth and modulate angle of incidence light, which needed an expensive a nd complicated apparatus. The device presented here is a relatively si mple and inexpensive, It was designed on the basis of fixing angle of incidence light in the range of the wavelength of 400 similar to 800 n m, The reflected light intensity is the minimum at the resonant wavele ngth, a smaller increase in refractive index of the analyzed solution would cause a clear shift in the SPR reflection spectra toward larger resonant wavelength. The sensitivity to refractive index changes was f ound to be 4.6 X 10(-4) index of refraction units at a wavelength of 5 75 nm. Some sample were analyzed with the sensor. The results obtained are in good agreement with those obtained with other method. Under th e selected experimental conditions, the sensor has a good repeatabilit y (RSD less than or equal to 1.4).