Nanometer-sized CdTe quantum dots (QDs) in D₂O can be optically trapped by a high repetition-rate picosecond Nd:YLF laser with an input power as low as 1000.3em0exmW. A large two-photon absorption (TPA) cross section of 10⁴--10⁵0.3em0exGM for CdTe QDs makes it possible to detect the trapping process with TPA induced luminescence. In D₂O, the luminescence intensity of CdTe QDs was found to increase with time, whereas an intensity decrease was clearly detected in H₂O. In addition, the optically trapped CdTe QDs were fixed on a hydrophilic glass substrate. Laser trapping of QDs may provide a basic technique for quantum information and biological applications.
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Ishikawa et al. (2007) studied this question.
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