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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 12 — Dec. 1, 2012
  • pp: 3240–3247

Probing of ultrahigh optical Q-factors of individual liquid microdroplets on superhydrophobic surfaces using tapered optical fiber waveguides

Alexandr Jonáš, Yasin Karadag, Michael Mestre, and Alper Kiraz  »View Author Affiliations


JOSA B, Vol. 29, Issue 12, pp. 3240-3247 (2012)
http://dx.doi.org/10.1364/JOSAB.29.003240


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Abstract

We report measurements of ultrahigh quality factors ( Q -factors) of the optical whispering-gallery modes excited via a tapered optical-fiber waveguide in single glycerol–water microdroplets standing on a superhydrophobic surface in air. Owing to the high contact angle of the glycerol–water mixture on the superhydrophobic surface ( > 155 ° ), microdroplets with the geometry of a truncated sphere minimally distorted by gravity and contact line pinning effects could be generated. Q -factors up to 2.3 × 10 6 were observed for such droplets with radii of 100 200 μm exposed to the ambient atmosphere in a closed chamber with controlled relative humidity. Placement of microdroplets in a constant humidity environment permitted prolonged characterization of Q -factors for individual microdroplets. We found that the Q -factors in air were stable over more than 1 h and their measured values were limited mostly by the thermally induced droplet shape fluctuations.

© 2012 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(130.3120) Integrated optics : Integrated optics devices
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(140.3945) Lasers and laser optics : Microcavities

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 19, 2012
Revised Manuscript: October 5, 2012
Manuscript Accepted: October 9, 2012
Published: November 8, 2012

Citation
Alexandr Jonáš, Yasin Karadag, Michael Mestre, and Alper Kiraz, "Probing of ultrahigh optical Q-factors of individual liquid microdroplets on superhydrophobic surfaces using tapered optical fiber waveguides," J. Opt. Soc. Am. B 29, 3240-3247 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-12-3240

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