Abstract：We analyzed the resonance mode and sensitivity of the surface plasmon resonance (SPR) sensor coupled by two kinds of nanoparticle arrays. Most of the sensors use a Kretschmann structure composed of five layers of materials: namely prism, gold film, SiO2 medium, nanoparticle array and air. The effective dielectric constants of AuNps layer and CSNps layer of core-shell structure were calculated by using Maxwell-Garnett theory. Then their propagation characteristics were analyzed with the generalized reflection coefficient. Firstly, the simulation results show the reflectance and modal field distribution of AuNps array with different thickness and geometry. Secondly,the CSNps array structure shows that multiple resonance modes can be excited under TM polarization,and the inner core radius and shell thickness will affect the sensitivity of the SPR sensor,with the inner core radius having a greater impact on sensitivity.The spacing and size of the nanoparticles will affect the concentration of CSNps in the array layer,thereby affecting sensitivity.
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2023, Vol. 44 
