Resonance Effect of Bimetallic Diffraction Grating on the Sensing Characteristics of Surface Plasmon Resonance Sensor with COMSOL Multiphysics

In this article, we present the resonance effect of bimetallic diffraction grating on the Performance of surface plasmon resonance sensor. The bimetallic diffraction grating consists of gratings of metals like gold, silver, aluminum etc. The sensor can be used for sensing variety of organic compounds like glucose, sucrose etc. High sensitivity is obtained if negative diffraction order of metallic grating is used to excite the surface plasmon. Therefore, surface plasmon waves are excited by - 1st diffraction order. Using numerical simulaion sensing performance is evaluated in terms of sensitivity, full-width half maximum, reflectance amplitude, width of the surface plasmon resonance curve and shift in resonant angle. These factors are considered for the bio-sensing performance analysis. Our results shows that bimetallic diffraction grating based surface plasmon resonance - sensor proves to be best for sensing applications and provides maximum sensitivity in angular interrogation with good linearity.