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Ultralow threshold on-chip microcavity nanocrystal quantum dot lasers

Min, Bumki and Kim, Sungjee and Okamoto, Koichi and Yang, Lan and Scherer, Axel and Atwater, Harry A. and Vahala, Kerry J. (2006) Ultralow threshold on-chip microcavity nanocrystal quantum dot lasers. Applied Physics Letters, 89 (19). Art. No. 191124. ISSN 0003-6951. doi:10.1063/1.2387966.

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Chemically synthesized nanocrystal, CdSe/ZnS (core/shell), quantum dots are coated on the surface of an ultrahigh-Q toroidal microcavity and the lasing is observed at room and liquid nitrogen temperature by pulsed excitation of quantum dots, either through tapered fiber or free space. Use of a tapered fiber coupling substantially lowered the threshold energy when compared with the case of free space excitation. The reason for the threshold reduction is attributed to the efficient delivery of pump pulses to the active gain region of the toroidal microcavity. Further threshold reduction was possible by quantum dot surface-coverage control. By decreasing the quantum dot numbers on the surface of the cavity, the threshold energy is further decreased down to 9.9 fJ.

Item Type:Article
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Atwater, Harry A.0000-0001-9435-0201
Vahala, Kerry J.0000-0003-1783-1380
Additional Information:© 2006 American Institute of Physics (Received 6 July 2006; accepted 4 October 2006; published online 9 November 2006) This work was supported by the plasmonic MURI. Correspondence and requests for materials should be addressed to one of the authors (K.V.). Another author (B.M.) thanks Y.-B. Park for measuring AFM images of QD cast toroidal microcavity surfaces.
Subject Keywords:quantum dot lasers; nanostructured materials; optical fibre couplers; cadmium compounds; zinc compounds; II-VI semiconductors; Q-factor; microcavity lasers
Issue or Number:19
Record Number:CaltechAUTHORS:MINapl06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6308
Deposited By: Archive Administrator
Deposited On:01 Dec 2006
Last Modified:08 Nov 2021 20:32

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