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Appl. Phys. Lett. 100, 061125 (2012); http://dx.doi.org/10.1063/1.3684249 (3 pages)

Directional waveguide coupling from a wavelength-scale deformed microdisk laser

Brandon Redding1, Li Ge2, Glenn S. Solomon3, and Hui Cao1

1Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA
2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
3Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899, USA

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(Received 23 September 2011; accepted 23 January 2012; published online 10 February 2012)

We demonstrate uni-directional evanescent coupling of lasing emission from a wavelength-scale deformed microdisk to a waveguide. This is attributed to the Goos-Hänchen shift and Fresnel filtering effect that result in a spatial separation of the clockwise (CW) and counter-clockwise (CCW) propagating ray orbits. By placing the waveguide tangentially at different locations to the cavity boundary, we may selectively couple the CW (CCW) wave out, leaving the CCW (CW) wave inside the cavity, which also reduces the spatial hole burning effect. The device geometry is optimized with a full-wave simulation tool, and the lasing behavior and directional coupling are confirmed experimentally.

© 2012 American Institute of Physics

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International Patent Classification (IPC)

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0003-6951 (print)  
1077-3118 (online)

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