Sensitivity Improvement of a Surface Plasmon Resonance Sensor Based on Two-Dimensional Materials Hybrid Structure in Visible Region: A Theoretical Study

• DOI: 10.3390/s20092445
• Publication Date: 2020-04-28T14:30:58Z
• Authors: Zhining Lin; Shujing Chen; Chengyou Lin
• Keywords: Visible spectrum; Ray; Localized surface plasmon

In this paper, we propose a surface plasmon resonance (SPR) sensor based on two-dimensional (2D) materials (graphene, MoS2, WS2 and WSe2) hybrid structure, theoretically investigate its sensitivity improvement in the visible region. The thickness of metal (Au, Ag or Cu) layer number each 2D material are optimized using genetic algorithms to obtain highest for specific wavelength incident light. Then, sensitivities proposed SPR sensors with different films at various wavelengths compared. An Ag-based exhibits higher than an Au- Cu-based one most addition, varies obviously light, shows maximum value 159, 194 155°/RIU Au, Cu, respectively. It is demonstrated that materials’ structure can be further improved by optimizing