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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 3 — Mar. 1, 2007
  • pp: 653–659

Whispering-gallery modes in a microsphere coated with a high-refractive index layer: polarization-dependent sensitivity enhancement of the resonance-shift sensor and TE–TM resonance matching

Iwao Teraoka and Stephen Arnold  »View Author Affiliations


JOSA B, Vol. 24, Issue 3, pp. 653-659 (2007)
http://dx.doi.org/10.1364/JOSAB.24.000653


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Abstract

Sensitivity enhancement of a whispering-gallery-mode microsphere resonance-shift sensor by coating of a high-refractive index (RI) layer is examined for TM polarization. The enhancement of sensitivity in response to particle adsorption or a RI change of the surroundings at the optimized layer thickness is greater for the TM mode compared with the TE mode, but the TM mode requires a thicker layer. A particular choice of the layer thickness allows the TE and TM shifts to match. Matching of the resonance frequency of the two modes is also examined.

© 2007 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:
Physical Optics

History
Original Manuscript: September 28, 2006
Manuscript Accepted: October 27, 2006
Published: February 15, 2007

Virtual Issues
Vol. 2, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Iwao Teraoka and Stephen Arnold, "Whispering-gallery modes in a microsphere coated with a high-refractive index layer: polarization-dependent sensitivity enhancement of the resonance-shift sensor and TE-TM resonance matching," J. Opt. Soc. Am. B 24, 653-659 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-3-653


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References

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  14. O. Gaathon, J. Culic-Viskota, M. Mihnev, I. Teraoka, and S. Arnold, "Enhancing sensitivity of a whispering gallery mode bio-sensor by sub-wavelength confinement," Appl. Phys. Lett. 89, 223901 (2006). [CrossRef]
  15. I. Teraoka and S. Arnold, "Theory on resonance shifts in TE and TM whispering gallery modes by non-radial perturbations for sensing applications," J. Opt. Soc. Am. B 23, 1381-1389 (2006). [CrossRef]
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  18. I. Teraoka and S. Arnold, "Dielectric property of particles at interface in random sequential adsorption and its application to whispering gallery mode resonance-shift sensors," J. Appl. Phys. (to be published).

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