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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 26 — Dec. 26, 2005
  • pp: 10754–10759

Tuning whispering gallery modes in optical microspheres with chemical etching

Ian M. White, Niranjan M. Hanumegowda, Hesam Oveys, and Xudong Fan  »View Author Affiliations

Optics Express, Vol. 13, Issue 26, pp. 10754-10759 (2005)

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We demonstrate a new method to tune the resonance of whispering gallery modes in a fused silica optical microsphere resonator by removing atomic layers from the sphere surface with low concentrations of hydrofluoric acid. Our results show that the WGMs can be tuned over 660 pm (430 GHz), more than one free spectral range of the microsphere resonator, with a tuning precision better than 0.2 pm (130 MHz). Both atomic force microscope images and a Q-factor measurement performed in air suggest that no additional degradation in Q-factor due to surface roughness is introduced during this etching process.

© 2005 Optical Society of America

OCIS Codes
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(230.5750) Optical devices : Resonators
(300.6320) Spectroscopy : Spectroscopy, high-resolution

ToC Category:
Research Papers

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

Ian M. White, Niranjan M. Hanumegowda, Hesam Oveys, and Xudong Fan, "Tuning whispering gallery modes in optical microspheres with chemical etching," Opt. Express 13, 10754-10759 (2005)

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