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    Efficient optical trapping of CdTe quantum dots by femtosecond laser pulses

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    Type
    Article
    Authors
    Chiang, Weiyi
    Okuhata, Tomoki
    Usman, Anwar
    Tamai, Naoto
    Masuhara, Hiroshi
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2014-06-24
    Online Publication Date
    2014-06-24
    Print Publication Date
    2014-12-11
    Permanent link to this record
    http://hdl.handle.net/10754/563918
    
    Metadata
    Show full item record
    Abstract
    The development in optical trapping and manipulation has been showing rapid progress, most of it is in the small particle sizes in nanometer scales, substituting the conventional continuous-wave lasers with high-repetition-rate ultrashort laser pulse train and nonlinear optical effects. Here, we evaluate two-photon absorption in optical trapping of 2.7 nm-sized CdTe quantum dots (QDs) with high-repetition-rate femtosecond pulse train by probing laser intensity dependence of both Rayleigh scattering image and the two-photon-induced luminescence spectrum of the optically trapped QDs. The Rayleigh scattering imaging indicates that the two-photon absorption (TPA) process enhances trapping ability of the QDs. Similarly, a nonlinear increase of the two-photon-induced luminescence with the incident laser intensity fairly indicates the existence of the TPA process.
    Sponsors
    This work was supported the Ministry of Education of Taiwan (MOE-ATU Project; National Chiao Tung University) and the National Science Council of Taiwan (Grant NSC 100-2113-M-009-001). H.M. also thanks the Foundation of the Advancement for Outstanding Scholarship of Taiwan. The reviewers are also acknowledged for their valuable comments and advice.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry B
    DOI
    10.1021/jp502524f
    ae974a485f413a2113503eed53cd6c53
    10.1021/jp502524f
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Solar Center (KSC)

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