Abstract
This paper presents finite numerical modelling on the cross-sectional region of tapered single mode fiber and graphene-clad tapered fiber. Surface acoustic wave propagation across the tapered surface region on tapered single mode fiber has a high threshold power at 61.87 W which is challenging to overcome by the incident pump wave. Surface acoustic wave propagation of fiber surface however made tapered wave plausible in the optical sensor application. This research introduces graphene as the cladding layer on tapered fiber, acoustic confinement occurs due to the graphene cladding which lowers the threshold power from 61.87 W to 2.17 W.
Highlights
Stimulated Brillouin Scattering (SBS) is an optical scattering process caused by the non-linearity of a medium
This section firstly presents the fundamental optical and acoustic waveguides of tapered fiber (TF) and grapheneclad tapered fiber (GCTF) using Finite Element Method (FEM) programmed in Fortran
This research work was undertaken to perform Stimulated Brillouin Scattering characterization on the crosssectional region of tapered fiber and the change in result when graphene is clad on the fiber surface
Summary
Stimulated Brillouin Scattering (SBS) is an optical scattering process caused by the non-linearity (χχ3) of a medium. The Stoke wave will generate a strong optical Brillouin gain which can be used to amplify the weak injected wave [3] Threshold power has both its functionality and limitation. Recent finding in SBS across tapered Silica fiber presented a high threshold power (60 W) which is undesired in SBS application [9]. This happens because Surface Acoustic Wave (SAW) at tapered waist region has minimum interaction with optical wave. Recent finding proved the functionality of graphene oxide clad tapered fiber bio-sensor for DNA detection [23]. Thorough literature reveals that FEM is a mature numerical modelling tool for fiber modelling such as for hollow fiber, inextensible fibers and ceramic matrix continuous [28,29,30]
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