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The purpose of this paper is to analyse the SPR based optical fiber sensor (core diameter ≈ 6um) on which a layer of gold metal having thickness (hAu ≈ 0.5-5 nm) is deposited by removing cladding for particular sensing region. We have examined the effect of different mode profiles (TM01, TM02, TM03….TM08) on the guiding region for different thicknesses of metal layer. The various mode profiles are further investigated to examine the impact on the sensitivity of said sensor. The said mode profiles for above said sensor are studied using finite difference time domain (FDTD) simulations. Transmission spectra for different TM modes are also compared with respect to the operating wavelength. We observed that the thickness of metal film and operating wavelength are responsible for variation in the sensitivity with respect to TM modes of the said sensor..
SPR (surface plasmon resonance), Refractive index (RI), Optical sensor, Finite-difference time domain (FDTD).
SAXENA PRAGYA, PRADEEP TEOTIA, R. S. KALER, Effect of different TM modes on the sensitivity of surface plasmon resonance based optical fiber sensor, Optoelectronics and Advanced Materials - Rapid Communications, 10, 5-6, May-June 2016, pp.343-346 (2016).
Submitted at: March 18, 2015
Accepted at: June 9, 2016