High-Sensitivity PtSe₂ Surface Plasmon Resonance Biosensor Based on Metal-Si-Metal Waveguide Structure.

Area of Science:

• Materials Science
• Nanotechnology
• Biosensing

Background:

• Traditional surface plasmon resonance (SPR) biosensors face limitations in sensitivity and performance.
• Transition metal dichalcogenides (TMDCs) like PtSe2 offer unique properties for optical applications.

Purpose of the Study:

• To develop an improved SPR biosensor by integrating a metal-Si-metal waveguide structure.
• To investigate the influence of different metals and PtSe2 thickness on biosensor performance.

Main Methods:

• Fabrication and characterization of a novel metal-Si-metal waveguide structure incorporating PtSe2.
• Systematic study of varying metal compositions (e.g., Au) and PtSe2 thicknesses.
• Optimization of the biosensor structure for maximum sensitivity.

Main Results:

• The optimized BK7-Au-Si-Au-PtSe2 (2 nm) biosensor structure demonstrated a significantly enhanced sensitivity of 193.8°/RIU.
• The study analyzed the impact of different metal choices and PtSe2 layer thickness on SPR performance.

Conclusions:

• The proposed metal-Si-metal waveguide structure with PtSe2 represents a significant advancement in SPR biosensor technology.
• This research offers a new pathway for developing high-performance SPR biosensors for various applications.