Efficient optical trapping of CdTe quantum dots by femtosecond laser pulses
Online Publication Date2014-06-24
Print Publication Date2014-12-11
Permanent link to this recordhttp://hdl.handle.net/10754/563918
MetadataShow full item record
AbstractThe 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.
SponsorsThis 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.
PublisherAmerican Chemical Society (ACS)