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Proceedings Paper

Photonic crystal nanocavity lasers with quantum dots
Author(s): Masahiro Nomura; Satoshi Iwamoto; Yasuhiko Arakawa
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Paper Abstract

We demonstrate quantum dot (QD) based continuous-wave photonic crystal (PhC) nanocavity laser operates at room temperature with a very low effective threshold power of ~ 375 nW. The continuous-wave lasing was achieved at 1.3 μm with InAs/GaAs self-assembled QDs and high quality PhC nanocavity with a quality factor of 87,000. The light-in versus light-out curve shows no sharp threshold unlike conventional lasers with pronounced kinks around the thresholds. This near-thresholdless behavior with smooth transition from thermal to coherent light region indicates that this nanocavity laser has a very high spontaneous emission coupling efficiency. The temporal coherence of such a high-β laser was studied by interference measurements. We also discuss the characteristics of background noise of QD based PhC nanocavity lasers compared with quantum well based PhC nanocavity lasers.

Paper Details

Date Published: 10 September 2007
PDF: 10 pages
Proc. SPIE 6779, Nanophotonics for Communication: Materials, Devices, and Systems IV, 67790G (10 September 2007); doi: 10.1117/12.731936
Show Author Affiliations
Masahiro Nomura, The Univ. of Tokyo (Japan)
Satoshi Iwamoto, The Univ. of Tokyo (Japan)
Yasuhiko Arakawa, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 6779:
Nanophotonics for Communication: Materials, Devices, and Systems IV
Nibir K. Dhar; Achyut Kumar Dutta; M. Saif Islam, Editor(s)

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