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Proceedings Paper

Towards spatio-temporal control in optical trapping
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Paper 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.

Paper Details

Date Published: 20 August 2009
PDF: 7 pages
Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74000G (20 August 2009); doi: 10.1117/12.824372
Show Author Affiliations
Debjit Roy, Indian Institute of Technology Kanpur (India)
Arijit Kumar De, Indian Institute of Technology Kanpur (India)
Debabrata Goswami, Indian Institute of Technology Kanpur (India)


Published in SPIE Proceedings Vol. 7400:
Optical Trapping and Optical Micromanipulation VI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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