Title: Highly sensitive photonic crystal fiber on hybrid layer of metal or 2D materials

Abstract

Platinum Diselenide, PtSe2 is gaining popularity due to its intriguing optoelectronic, thermoelectric, and semiconductor properties. They are non-toxic, chemically inert, and allow for high biomolecule absorption, making them ideal for use in sensors to improve sensing. Here, we proposed Photonic Crystal Fiber (PCF) based Surface Plasmon Resonance (SPR) sensor for enhanced refractive index sensing at mid infrared wavelengths. To achieve this, Tri-Path PCF (TP-PCF) was coated with a gold/PtSe2 hybrid layer, which allows light to freely pass through the cladding and interact with the plasmonic material, resulting in a significant coupling effect. Finite Element Method is used for numerical examination and exhibits maximum wavelength sensitivity of 42,000 nm/RIU and maximum wavelength resolution of 2.4 x 10-6 within the analyte range from 1.33 to 1.38, which almost covers the unknown analytes of chemical and bio.