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Weak coupling interactions of colloidal lead sulphide nanocrystals with silicon photonic crystal nanocavities near 1.55  µm at room temperature

Appl. Phys. Lett. 90, 111117 (2007); doi:10.1063/1.2714097

Published 16 March 2007

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Ranojoy Bose, Xiaodong Yang, Rohit Chatterjee, Jie Gao, and Chee Wei Wong
Optical Nanostructures Laboratory, Columbia University, New York, New York 10027
The authors observe the weak coupling of lead sulphide nanocrystals to localized defect modes of two-dimensional silicon nanocavities. Cavity resonances characterized with ensemble nanocrystals are verified with cold-cavity measurements using integrated waveguides. Polarization dependence of the cavity field modes is observed. The linewidths measured in coupling experiments are broadened in comparison to the cold-cavity characterization, partly due to large homogeneous linewidths of the nanocrystals. The calculated Purcell factor [Phys. Rev. 69, 681 (1946)] for a single exciton is 100, showing promise toward applications in single photon systems. These novel light sources operate near 1.55  µm wavelengths at room temperature, permitting integration with current fiber communication networks. ©2007 American Institute of Physics
History: Received 20 September 2006; accepted 11 February 2007; published 16 March 2007
Permalink: http://link.aip.org/link/?APPLAB/90/111117/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.70.Qs
    Photonic bandgap materials
  • 71.35.-y
    Excitons and related phenomena
  • YEAR: 2007

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