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Optics Letters

Optics Letters


  • Vol. 36, Iss. 15 — Aug. 1, 2011
  • pp: 2862–2864

Fiber coupling to BaTiO 3 glass microspheres in an aqueous environment

Oleksiy Svitelskiy, Yangcheng Li, Arash Darafsheh, Misha Sumetsky, David Carnegie, Edik Rafailov, and Vasily N. Astratov  »View Author Affiliations

Optics Letters, Vol. 36, Issue 15, pp. 2862-2864 (2011)

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Compact microspheres with high-quality (Q) whispering gallery modes are required for many applications involving liquid immersion, such as sensing nanoparticles and studying resonant radiative pressure effects. We show that high-index (1.9 and 2.1) barium titanate glass (BTG) microspheres are perfect candidates for these applications due to their high-Q ( 10 4 in the 1100 1600 nm range) resonances evanescently excited in spheres with diameters of 4 15 μm . By reattaching the spheres at different positions along a tapered optical fiber, we show that the coupling constant exponentially increases with thinner fiber diameters. We demonstrate the close to critical coupling regime with intrinsic Q = 3 × 10 4 for water immersed 14 μm BTG spheres.

© 2011 Optical Society of America

OCIS Codes
(120.3150) Instrumentation, measurement, and metrology : Integrating spheres
(140.4780) Lasers and laser optics : Optical resonators
(230.5750) Optical devices : Resonators

ToC Category:
Lasers and Laser Optics

Original Manuscript: June 1, 2011
Revised Manuscript: July 2, 2011
Manuscript Accepted: July 2, 2011
Published: July 25, 2011

Oleksiy Svitelskiy, Yangcheng Li, Arash Darafsheh, Misha Sumetsky, David Carnegie, Edik Rafailov, and Vasily N. Astratov, "Fiber coupling to BaTiO3 glass microspheres in an aqueous environment," Opt. Lett. 36, 2862-2864 (2011)

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