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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 8 — Aug. 1, 2007
  • pp: 1981–1986

Surface plasmon resonance-assisted coupling to whispering-gallery modes in micropillar resonators

Nick K. Hon and Andrew W. Poon  »View Author Affiliations

JOSA B, Vol. 24, Issue 8, pp. 1981-1986 (2007)

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We report experiments and modeling of surface plasmon resonance (SPR)-assisted coupling to whispering-gallery modes in dielectric microresonators. Our experiments use a gold-coated glass-prism that is evanescently coupled to a 125 - μ m -diameter silica-micropillar resonator. We find nearly 12-fold enhancement in the whispering-gallery resonance extinction ratio in the vicinity of the SPR angle using a 50 - nm gold-film. The measured trends of the enhancement, as a function of the laser-beam incident angle and the gold-film thickness, show good qualitative agreement with our modeling of SPR-assisted coupling to ring resonator modes. Our modeling suggests that the far-field interference between the SPR-enhanced microresonator mode field and the attenuated total internal reflected field from the prism gives the observed extinction ratio enhancement.

© 2007 Optical Society of America

OCIS Codes
(230.5750) Optical devices : Resonators
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance

ToC Category:
Optics at Surfaces

Original Manuscript: March 6, 2007
Revised Manuscript: April 15, 2007
Manuscript Accepted: April 23, 2007
Published: July 19, 2007

Nick K. Hon and Andrew W. Poon, "Surface plasmon resonance-assisted coupling to whispering-gallery modes in micropillar resonators," J. Opt. Soc. Am. B 24, 1981-1986 (2007)

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