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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 7 — Jul. 1, 2006
  • pp: 1434–1441

Enhancing the sensitivity of a whispering-gallery mode microsphere sensor by a high-refractive-index surface layer

Iwao Teraoka and Stephen Arnold  »View Author Affiliations


JOSA B, Vol. 23, Issue 7, pp. 1434-1441 (2006)
http://dx.doi.org/10.1364/JOSAB.23.001434


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Abstract

We examine properties of whispering gallery modes (WGMs) in a dielectric microsphere coated with a high-refractive-index layer. With an increase in layer thickness, the photonic field of a WGM moves near the sphere’s surface, while the peak in its radial distribution narrows, followed by backtracking and broadening. During these changes, the resonance frequency decreases. The radial compression exposes a stronger evanescent field to the surroundings, yet the mode retains a sharp resonance peak in the frequency domain. The high-refractive-index layer will enhance the sensitivity of WGM frequency-shift sensors when used to detect adsorption of molecules and a change in refractive index in the surroundings. A possibility to match resonance shifts of different radial modes in the measurement of refractive indices is proposed.

© 2006 Optical Society of America

OCIS Codes
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(260.2110) Physical optics : Electromagnetic optics
(300.6490) Spectroscopy : Spectroscopy, surface

ToC Category:
Spectroscopy

History
Original Manuscript: October 14, 2005
Revised Manuscript: January 16, 2006
Manuscript Accepted: February 7, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Iwao Teraoka and Stephen Arnold, "Enhancing the sensitivity of a whispering-gallery mode microsphere sensor by a high-refractive-index surface layer," J. Opt. Soc. Am. B 23, 1434-1441 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-7-1434

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