Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1927-1930Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100924z
Keywords
Quantum dots; optical trapping; two-photon-absorption; fluorescence microscopy; nanoparticles
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A single CW infrared laser beam can simultaneously trap and excite an individual colloidal quantum dot. Though the laser light is relatively weak, the excitation occurs through two-photon absorption. This finding eliminates the demand for an excitation light source in addition to a trapping laser in nanoscale experiments with simultaneous force-manipulation and quantum dot visualization. Also, we demonstrate that optical trapping efficiencies of individual quantum dots do not correlate with their emission wavelength or physical size.
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