Germanium microsphere high-Q resonator

Wang, Pengfei, Lee, Timothy, Ding, Ming, Dhar, Anirban, Hawkins, Thomas, Foy, Paul, Semenova, Yuliya, Wu, Qiang, Sahu, Jayanta, Farrell, Gerald, Ballato, John and Brambilla, Gilberto (2012) Germanium microsphere high-Q resonator. Optics Letters, 37, (4), 728-730. (doi:10.1364/OL.37.000728).


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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 x 10^4 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.

Item Type: Article
ISSNs: 0146-9592 (print)
1539-4794 (electronic)
Related URLs:
Subjects: Q Science > QC Physics
Divisions: Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
ePrint ID: 333954
Date Deposited: 06 Mar 2012 14:07
Last Modified: 27 Mar 2014 20:19

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