Nanometer-sized CdTe quantum dots (QDs) in D2 O can be optically trapped by a high repetition-rate picosecond Nd:YLF laser with an input power as low as 100 mW. A large two-photon absorption (TPA) cross section of 104 - 105 GM for CdTe QDs makes it possible to detect the trapping process with TPA induced luminescence. In D2 O, the luminescence intensity of CdTe QDs was found to increase with time, whereas an intensity decrease was clearly detected in H2 O. 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.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2007 Apr 30
ASJC Scopus subject areas
- Condensed Matter Physics