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20 August 2009 Towards spatio-temporal control in optical trapping
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Abstract
Using both continuous-wave (CW) and high repetition rate femtosecond lasers, we present stable 3-dimensional trapping of 1μm polystyrene microspheres. We also stably trapped 100nm latex nanoparticles using the femtosecond mode-locked laser at a very low average power where the CW lasers cannot trap, demonstrating the significance of the fleeting temporal existence of the femtosecond pulses. Trapping was visualized through dark-field microscopy as well as through a noise free detection using two-photon fluorescence as a diagnostics tool owing to its intrinsic 3- dimensional resolution. Comparison between a Gaussian versus a flat-top Gaussian beam profile demonstrates the importance of laser spatial mode in optical trapping.
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Debjit Roy, Arijit Kumar De, and Debabrata Goswami "Towards spatio-temporal control in optical trapping", Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74000G (20 August 2009); https://doi.org/10.1117/12.824372
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