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Subwavelength Nanopatch Cavities for Semiconductor Plasmon Lasers

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2 Author(s)
Manolatou, Christina ; Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY ; Rana, Farhan

We propose and analyze a family of nanoscale cavities for electrically pumped surface-emitting semiconductor lasers that use surface plasmons to provide optical mode confinement in cavities which have dimensions in the 100-300-nm range. The proposed laser cavities are in many ways nanoscale optical versions of micropatch antennas that are commonly used at microwave/RF frequencies. Surface plasmons are not only used for mode confinement but also for output beam shaping to realize single-lobe far-field radiation patterns with narrow beam waists from subwavelength size cavities. We identify the cavity modes with the largest quality factors and modal gain, and show that in the near-IR wavelength range (1.0-1.6 mum) cavity losses (including surface plasmon losses) can be compensated by the strong mode confinement in the gain region provided by the surface plasmons themselves and the required material threshold gain values can be smaller than 700 cm-1.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:44 ,  Issue: 5 )

Date of Publication:

May 2008

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