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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 4 — Feb. 15, 2012
  • pp: 728–730

Germanium microsphere high-Q resonator

Pengfei Wang, Timothy Lee, Ming Ding, Anirban Dhar, Thomas Hawkins, Paul Foy, Yuliya Semenova, Qiang Wu, Jayanta Sahu, Gerald Farrell, John Ballato, and Gilberto Brambilla  »View Author Affiliations


Optics Letters, Vol. 37, Issue 4, pp. 728-730 (2012)
http://dx.doi.org/10.1364/OL.37.000728


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Abstract

In this Letter, the fabrication and characterization of a microsphere resonator from the semiconductor germanium is demonstrated. Whispering gallery modes are excited in a 46 μm diameter germanium microsphere resonator using evanescent coupling from a tapered silica optical fiber with a waist diameter of 2 μm. Resonances with Q factors as high as 3.8×104 at wavelengths near 2 μm are observed. Because of their ultrahigh optical nonlinearities and extremely broad transparency window, germanium microsphere resonators offer the potential for optical processing devices, in particular at long wavelengths, such as around 2 μm.

© 2012 Optical Society of America

OCIS Codes
(130.5990) Integrated optics : Semiconductors
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4780) Lasers and laser optics : Optical resonators
(160.6000) Materials : Semiconductor materials

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 18, 2011
Revised Manuscript: January 11, 2012
Manuscript Accepted: January 12, 2012
Published: February 15, 2012

Citation
Pengfei Wang, Timothy Lee, Ming Ding, Anirban Dhar, Thomas Hawkins, Paul Foy, Yuliya Semenova, Qiang Wu, Jayanta Sahu, Gerald Farrell, John Ballato, and Gilberto Brambilla, "Germanium microsphere high-Q resonator," Opt. Lett. 37, 728-730 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-4-728


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