Efficient optical trapping of CdTe quantum dots by femtosecond laser pulses

Wei Yi Chiang, Tomoki Okuhata, Anwar Usman*, Naoto Tamai, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

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.

Original languageEnglish
Pages (from-to)14010-14016
Number of pages7
JournalJournal of Physical Chemistry B
Volume118
Issue number49
DOIs
StatePublished - 11 Dec 2014

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