Design and Simulation of Au/SiO2 Nanospheres Based on SPR Refractive Index Sensor

Abstract

In this paper, three different structures of surface plasmon resonance (SPR) sensors based on the Kretschmann configuration: Au/SiO2 thin film structure, Au/SiO2 nanospheres and Au/SiO2 nanorods are designed by adding three different forms of SiO2 materials behind the gold film of conventional Au-based SPR sensors. The effects of SiO2 shapes on the SPR sensor are investigated through modeling and simulation with the refractive index of the media to be measured ranging from 1.330 to 1.365. The results show that the sensitivity of Au/SiO2 nanospheres could be as high as 2875.4 nm/RIU, which is 25.96% higher than that of the sensor with a gold array. More interestingly, the increase in sensor sensitivity is attributed to the change in SiO2 material morphology. Therefore, this paper mainly explores the influence of the shape of the sensor-sensitizing material on the performance of the sensor.

Computational Modeling for Intelligent Surface Plasmon Resonance Sensor Design and Experimental Schemes for Real‐Time Plasmonic Biosensing: A Review

“…[ 32 ] With a better understanding of the physical properties involved in plasmonic sensing, researchers will have greater control over their experimental results, leading to more accurate and reliable data. [ 7 ] Simulation has become increasingly important as a tool for advancing research in this field, and its importance will only increase with time as new developments emerge. By utilizing simulation techniques, researchers can continue to push the boundaries of plasmonic sensing technology and uncover new applications for this powerful tool.…”

“…[ 6 ] For instance, ithas been shown in COMSOL Multiphysics software that it is possible to simulate a SPR sensor consisting of silica material and gold by combining the fluctuating optics module with COMSOL Multiphysics software. [ 7 ] Various shapes of SiO 2 are investigated in order to examine the effects on the SPR sensor. By utilizing SiO 2 , SPR sensor costs can be reduced.…”