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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 11 — Nov. 1, 2013
  • pp: 3079–3085

Structure of whispering gallery mode spectrum of microspheres coated with fluorescent silicon quantum dots

Y. Zhi, J. Valenta, and A. Meldrum  »View Author Affiliations


JOSA B, Vol. 30, Issue 11, pp. 3079-3085 (2013)
http://dx.doi.org/10.1364/JOSAB.30.003079


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Abstract

Whispering gallery modes (WGMs) in microspheres containing embedded fluorophores (e.g., organic dyes or quantum dots) may find refractometric sensing or microlasing applications. However, there have been relatively few investigations on the relationship between the intrinsic microsphere resonances and the WGMs observed in fluorescence spectra for emitters coupled to the microsphere. Here we find that an apparently simple fluorescence WGM spectrum can mask a much more complicated underlying microcavity mode structure and that the observed fluorescence spectra are controlled by the emitter linewidth. By examining the cavity structure, we also verify that an effective ensemble emitter linewidth can be extracted from the fluorescence data. Finally, spectral diffusion is suggested as a possible origin of the periodic fluorescence WGM spectra observed in many microsphere cavities, without which these resonances might be unobservable.

© 2013 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(230.5750) Optical devices : Resonators
(140.3948) Lasers and laser optics : Microcavity devices
(160.4236) Materials : Nanomaterials

ToC Category:
Materials

History
Original Manuscript: July 26, 2013
Manuscript Accepted: September 29, 2013
Published: October 31, 2013

Virtual Issues
January 28, 2014 Spotlight on Optics

Citation
Y. Zhi, J. Valenta, and A. Meldrum, "Structure of whispering gallery mode spectrum of microspheres coated with fluorescent silicon quantum dots," J. Opt. Soc. Am. B 30, 3079-3085 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-11-3079


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