Highly sensitive wave-theory based fiber optic refractive index sensor by shining radially polarized bessel-gauss beam : A SPR based technique
Bijaya Saha
National Institute of Technology Agartala, India
: Res J Opt Photonics
Abstract
In this paper, for the first time, an empirical analysis of a highly sensitive multilayered SPR-based fiber optic refractive index sensor applying wave theory has been suggested, configured, and simulated by utilizing a radially polarized Bessel-Gauss (RPBG) beam as a source. The proposed structure comprises a polarizationmaintaining fiber-coupled broadband laser source, radial polarization converter, higher-order mode (HOM) fiber and a no-core fiber (NCF) with a 125 μm core diameter. The length of the sensing layer is 10 mm, where, after removing the acrylate coating of the NCF, a 50 nm thin silver layer and, at last, the analyte layer is used. Here, technique based on wave theory is more prominent than ray theory, and by the use of this technique, consistency between analytical and experimental results can be accomplished. Now, better analysis and efficient excitation of HOMs within the NCF are also confirmed through this technique. The suggested scheme's main benefit is that it does not necessitate any modification to the waveguide dimensions like tapering, U-bent, and so on in order to significantly increase the sensor's sensitivity by switching from a Gaussian to an RPBG beam. Here, the observed sensitivity of the proposed scheme is 9650.00 dB/RIU, and it is to be noticed that with the change in refractive indices of the analyte layers, the SPR wavelength shifts towards the right. Due to the better performance of the proposed scheme, that accelerates the new prospects in the field of physical, chemical or sensing of biochemical cells.
Biography
Bijaya Saha is pursuing PhD in NIT Agartala. She has passed B.Tech from Tripura Institute of Technology, India, in 2015 and M.Tech degree from Tripura University, India, in 2018.Recently she is engaged with the project related to Fiber optic sensor. She has published 5 articles in International Journals ,1 articles in International Conference proceeding.
