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).
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