title: Effect of pulse temporal shape on optical trapping and impulse transfer using ultrashort pulsed lasers.
abstract: We investigate the effects of pulse duration on optical trapping with high repetition rate ultrashort pulsed lasers, through Lorentz-Mie theory, numerical simulation, and experiment. Optical trapping experiments use a 12 femtosecond duration infrared pulsed laser, with the trapping microscope's temporal dispersive effects measured and corrected using the Multiphoton Intrapulse Interference Phase Scan method. We apply pulse shaping to reproducibly stretch pulse duration by 1.5 orders of magnitude and find no material-independent effects of pulse temporal profile on optical trapping of 780nm silica particles, in agreement with our theory and simulation. Using pulse shaping, we control two-photon fluorescence in trapped fluorescent particles, opening the door to other coherent control applications with trapped particles.
authors.affiliation: SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom.
authors.forename: Janelle C
authors.initials: JC
authors.lastname: Shane
authors.forename: Michael
authors.initials: M
authors.lastname: Mazilu
authors.forename: Woei Ming
authors.initials: WM
authors.lastname: Lee
authors.forename: Kishan
authors.initials: K
authors.lastname: Dholakia
mesh_terms: D000465:Algorithms; D004574:Electromagnetic Fields; D005583:Fourier Analysis; D007834:Lasers; D008422:Materials Testing; D036641:Microscopy, Fluorescence, Multiphoton / Q000379:methods; D015233:Models, Statistical; D052898:Optical Tweezers; D055095:Optics and Photonics; D010316:Particle Size; D017785:Photons; D012822:Silicon Dioxide / Q000737:chemistry; D013997:Time Factors
chemical_list: D012822:Silicon Dioxide