High-Sensitivity Angle Modulation Biosensor Based on Surface Plasmon Resonance of Metasurface

Abstract

Metasurface is a popular artificial layered material. In this paper, a sensor based on surface plasmon resonance with a new type of symmetrical triangular structure is designed. This paper designs a metasurface structure, the highest sensitivity of 364 °/RIU is achieved by adopting angle modulation. We used COMSOL simulation software, the metal layer structure and size parameters are optimized to obtain the best reflectivity curve, and the accuracy of the simulation is improved through the linear interpolation method. Compared with the traditional gold layer structure, the sensitivity of 135 °/RIU is increased by 1.7 times. We believe that this design can have potential application value in the field of biosensing.