In this work, a high figure of merit (FOM) surface plasmon resonance (SPR) with bimetallic layer (Au/Ag) based on wavelength and angular combined interrogations approach is presented. To further addition the performance of the SPR sensor, the sum of the minimum reflectivity (Rmin) is calculated with the refractive index interval of 0.004 as a step from 1.33 to 1.37 at first. Then, the performance of the sensor is analyzed for varying silver-gold thickness. Our simulations indicate that the proposed configuration for Kretschmann’s SPR sensor should be silver (48 nm)-gold (1 nm) for achieving the best FOM (about 150 RIU-1).
To wavelength modulation SPR sensor, the measuring sensitivity of refractive index increases with wavelength. A broadband light source (700 nm~900 nm) with relative narrow bandwidth at long wavelength is selected, to measure the refractive index of surrounding medium by using SPR reflection power spectrums, in order to obtain relatively higher sensitivity and resolution. But the measuring range of refractive index is decreased by the reduction in bandwidth of light source. We propose a surface plasmon resonance sensor based on wavelength and angular combined modulations, in order to solve the mutual restriction of measuring range and sensitivity/ resolution, sectional measurement method is adopted, i.e. different incident angles are selected respectively, which will detect different measuring ranges of refractive index. Wavelength and angular combined SPR modulations can cover the whole measuring range of refractive index, and improve the measuring sensitivity and resolution simultaneously.
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