Abstract

We present a numerical and experimental study of surface plasmon resonance (SPR) excitation in a bent single-mode optical fiber with metalized cladding. It is shown that with a suitable combination of bend radius and metal film thickness surface plasmon waves can be excited in the film as a result of coupling between fundamental and surface plasmon modes via whispering gallery modes supported by the bent fiber cladding. The coupling brings about a dip in the transmission spectrum at the resonant wavelength which is strongly dependent on the ambient refractive index. This enables one to build a fiber optic SPR-refractometer with a standard single-mode fiber without breaking integrity of the fiber or using any additional elements. Refractometric sensitivity of ∼5 μm per refractive index unit and resolution of ∼4·10⁻⁶ are experimentally demonstrated for the measured refractive index around 1.43. The reported results may find wide application in bio- and chemosensing.

Analysis of surface plasmon resonance in bent single-mode waveguides with metal-coated cladding by eigenmode expansion method

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Modeling of surface plasmon resonance in metalized optical waveguides with low V number by eigenmode expansion method

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Tunable Fano-like resonances in a bent single-mode waveguide-based Fabry–Perot resonator

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Single-mode lasing by tailoring the excitation of localized surface plasmon resonances to whispering gallery modes in a microring laser

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Tailoring the plasmonic whispering gallery modes of a metal-coated resonator for potential application as a refractometric sensor

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