Abstract
Platinum Diselenide, PtSe2 is becoming highly trending owing to its fascinating optoelectronic, thermoelectric and semiconductor properties. They are non-toxic, chemically inert and allow high biomolecule absorption which makes them highly applicable in sensors to boost the sensing performance. Here, we propose Surface Plasmon Resonance (SPR) based Photonic Crystal Fiber (PCF) sensor for enhanced refractive index sensing at mid infrared wavelengths. In order to achieve this, tri-path PCF coated with hybrid layer of gold/PtSe2 which allows light to travel freely through the cladding and interact with the plasmonic material to create strong coupling effect. Finite Element Method is used for numerical examination and investigation of the sensing performance for the designed tri-path sensor. The optimized proposed sensor exhibits maximum wavelength sensitivity of 42,000 nm/RIU and maximum wavelength resolution of 2.4 × 10−6 within the analyte range from 1.33 to 1.38, which can be excellent detection of unknown chemical, biochemical and biological analytes. Further, we achieve very low loss and unique design to accomplish high sensitivity which makes it applicable to be a future candidate in various sensing applications.
Highlights
Photonic Crystal Fiber (PCF) is highly trending in photonics which is a single material providing a platform for sensing (Wei et al 2013)
Surface Plasmon Resonance (SPR) is a promising sensing technique that detects the minimum variation in refractive index (RI) when there is an interaction with the metal film
The proposed model sensing mechanism is based on the coupled mode theory (Ayyanar et al, 2018) which takes place amongst the evanescent field from the core mode that interacts with plasmonic mode at gold/Ptse2 layer to produce robust coupling effect
Summary
Photonic Crystal Fiber (PCF) is highly trending in photonics which is a single material providing a platform for sensing (Wei et al 2013). Surface Plasmon Resonance (SPR) is a promising sensing technique that detects the minimum variation in refractive index (RI) when there is an interaction with the metal film They expose high sensitivity results which makes it trending and highly applicable in various sensing fields. In 2016, SPR combined with D-shape PCF was mentioned with plasmonic metal employed as gold and additional coating layer of ITO for RI ranging from 1.28 to 1.34. The sensor functions for analyte RI range of 1.33 to 1.42, disclosing a maximum sensitivity of 28,000 nm/RIU (Al Mahfuz et al, 2020) These plasmonics with additional layers have low capability of biomolecule absorption. For the first time in this work, 2D material PtSe2 is integrated through plasmonics over the outer surface of PCF to upsurge the sensitivity which reveals the novelty for this work along with which the designed tri-path sensor exposes a low loss.
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