Comparative Analysis of Different Dielectric Buffer Layer in a Highly Sensitive Long-Range Surface Plasmon Resonance Imaging Sensor Having PtSe2 and Heterostructure of BlueP/MoS2.

This manuscript presents a Kretschmann configured long-range surface plasmon resonance (LRSPR) imaging sensor (structure: 2S2G prism-MgF2-Ag-PtSe2-BlueP/MoS2-SM) demonstrating ultrahigh imaging sensitivity, SImg. (23,250 RIU−1); detection accuracy, DA (50 Deg.−1); angular figure of merit, FoMAng. (1930.87 RIU−1); imaging figure of merit, FoMImg. (1,162,500 Deg.−1 RIU−1); and better penetration depth, PD (1129.4 nm), for sensing of biomolecules. The MATLAB and COMSOL simulation software are used for numerical analysis of the results. The effect of different dielectric buffer layers, DBLs (MgF2, LiF, Cytop & Teflon), and Ag/Au thin metal films on sensor performance has been substantiated to find the best suited DBL and metal film. The use of PtSe2 leads to further enhance sensor performance due to its high carrier mobility, tunable bandgap, chemical stability, and immunity to toxicity. Heterostructure of BlueP/MoS2 plays an important role in attachment of biomolecules due to larger surface area and higher optical adsorption efficiency (5%), quantum confinement effect of MoS2. Furthermore, heterostructure of BlueP/MoS2 leads to improve the sensor performance parameters due to high charge carrier transfer efficiency. Overall, larger PD of proposed LRSPR sensor is suitable to detect larger size biomolecules. Hence, the proposed sensor performance paves a way for its efficient use in field of biological molecule sensing. [ABSTRACT FROM AUTHOR]