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Published November 6, 2006 | Published
Journal Article Open

Ultralow threshold on-chip microcavity nanocrystal quantum dot lasers


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.

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.

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