Open AccessAnalysis of surface plasmon resonance in bent single-mode waveguides with metal-coated cladding by eigenmode expansion method
Author(s) -
Yu. N. Kulchin,
Oleg B. Vitrik,
A. V. Dyshlyuk
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.022196
Subject(s) - cladding (metalworking) , materials science , optics , surface plasmon , bent molecular geometry , optical fiber , surface plasmon resonance , cladding mode , bend radius , localized surface plasmon , single mode optical fiber , plasmon , wavelength , optoelectronics , polarization maintaining optical fiber , fiber optic sensor , physics , bending , nanoparticle , nanotechnology , composite material
A numerical study is presented of surface plasmon waves excitation in a metal film applied to the cladding of a standard bent single-mode optical fiber. It was shown that by adjusting the bend radius and metal film thickness one can achieve effective coupling between the fiber fundamental mode and symmetric surface plasmon mode through the intermediary of whispering gallery modes supported by the cladding of the bent fiber. This effect is demonstrated to allow for refractometric measurement both in the wavelength and intensity-modulated regimes with a resolution of up to 10⁻⁸ RIU. Usage of standard noise reduction techniques for intensity-modulated optical signals promises further increase in accuracy.