Numerical and Experimental Investigation of Surface Plasmon Resonance Excitation Using Whispering Gallery Modes in Bent Metal-Clad Single-Mode Optical Fiber

Numerical and Experimental Investigation of Surface Plasmon Resonance Excitation Using Whispering Gallery Modes in Bent Metal-Clad Single-Mode Optical Fiber

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 o...

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Bibliographic Details
Published in:Journal of lightwave technology Vol. 35; no. 24; pp. 5425 - 5431
Main Authors: Dyshlyuk, Anton V., Vitrik, Oleg B., Kulchin, Yuri N., Mitsai, Eugeniy V., Cherepakhin, Artem B., Branger, Catherine, Brisset, Hugues, Iordache, Tanta Verona, Sarbu, Andrei
Format: Journal Article
Language:English
Published: New York IEEE 15-12-2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Institute of Electrical and Electronics Engineers (IEEE)/Optical Society of America(OSA)
Subjects:
Analytical chemistry
Bend radius
Bent optical fiber
biosensing
Chemical Sciences
chemosensing
Clad metals
Construction standards
Coupling
Dip cladding
Excitation
fiber optic refractometer
Fiber optics
Film thickness
Optical fiber sensors
Optical fibers
Optical surface waves
Plasmons
Refractive index
Refractivity
Surface plasmon resonance
Surface waves
Whispering gallery modes
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Summary: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2017.2772299