Four-Layer Surface Plasmon Resonance Structures with Amorphous As₂S₃ Chalcogenide Films: A Review

Area of Science:

• Optoelectronics
• Materials Science
• Chemical Sensing

Background:

• Surface Plasmon Resonance (SPR) is a powerful optical sensing technique.
• Amorphous chalcogenide (ChG) films offer unique properties for plasmonic waveguide applications.
• SPR structures utilizing ChG films are crucial for advanced biosensing and chemical detection.

Purpose of the Study:

• To review and analyze SPR structures incorporating amorphous chalcogenide (ChG) films as plasmonic waveguides.
• To present calculation methods and characteristics of four-layer SPR structures with As2S3 and As2Se3 films.
• To demonstrate the tunability of SPR parameters and their application in analyte identification.

Main Methods:

• Theoretical calculations and analysis of four-layer SPR structures.
• Experimental validation of SPR characteristics and analyte detection.
• Investigation of coupling prism material properties and their influence on SPR performance.

Main Results:

• Control over resonance angle, curve sharpness, penetration depth, and sensitivity by adjusting SPR structure parameters.
• Demonstration of hysteresis loop in reflectance changes for As2S3 films.
• Successful identification of alcohols, hydrocarbons, and E. coli bacteria markers.

Conclusions:

• Amorphous chalcogenide films are effective plasmonic waveguides in SPR sensors.
• SPR structure design allows for fine-tuning of sensing performance.
• The developed SPR structures show promise for real-world sensing applications, including biological and chemical detection.