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Characterizing particle pairs optically bound in "tractor beam"

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    0472176 - ÚPT 2017 RIV US eng C - Conference Paper (international conference)
    Damková, Jana - Chvátal, Lukáš - Brzobohatý, Oto - Svak, V. - Šiler, Martin - Simpson, Stephen Hugh - Zemánek, Pavel
    Characterizing particle pairs optically bound in "tractor beam".
    Optical Trapping and Optical Micromanipulation XIII (Proceedings of SPIE 9922). Bellingham: SPIE, 2016, s. 1-7, č. článku 99221Q. ISBN 9781510602359. ISSN 0277-786X.
    [Optical Trapping and Optical Micromanipulation /13./. San Diego (US), 28.08.2016-01.09.2016]
    R&D Projects: GA ČR(CZ) GA14-16195S; GA MŠk(CZ) LO1212; GA TA ČR TE01020233; GA MŠk ED0017/01/01
    Institutional support: RVO:68081731
    Keywords : optical trapping * optical binding * tractor beam * holographic microscopy
    Subject RIV: BH - Optics, Masers, Lasers

    We report on an experimental and theoretical study of optical binding of polystyrene sphere pairs illuminated by retro-reflected wide Gaussian beam, so-called "tractor beam". We show that depending on configuration of particle pairs, optically bound structure in the "tractor beam" can be pushed or pulled against the beam propagation. We employ holographic video microscopy to analyse object positions in three dimensions and their time evolution. In such a way, we investigate their dynamics in dependence on the geometrical configuration that is compared with numerical simulations. We observe strong dependence of the particle pair motion on the relative distance of the particles.
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