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Theoretical comparison of optical traps created by standing wave and single beam

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    0205627 - UPT-D 20030009 RIV NL eng J - Journal Article
    Zemánek, Pavel - Jonáš, Alexandr - Jákl, Petr - Ježek, Jan - Šerý, Mojmír - Liška, M.
    Theoretical comparison of optical traps created by standing wave and single beam.
    Optics Communications. Roč. 220, 4-6 (2003), s. 401 - 412. ISSN 0030-4018
    R&D Projects: GA ČR GA101/00/0974
    Institutional research plan: CEZ:AV0Z2065902
    Keywords : single beam trap * optical trapping * optical tweezers
    Subject RIV: BH - Optics, Masers, Lasers
    Impact factor: 1.482, year: 2003

    We used generalised Lorenz-Mie scattering theory (GLMT) to compare submicron-sized particle optical trapping in a single focused beam and a standing wave. We focus especially on the study of maximal axial trapping force, minimal laser power necessary for confinement, axial trap position, and axial trap stiffness in dependency on trapped sphere radius, refractive index, and Gaussian beam waist size. In the single beam trap (SBT), the range of refractive indices which enable stable trapping depends strongly on the beam waist size (it grows with decreasing waist). On the contrary to the SBT, there are certain sphere sizes (non-trapping radii) that disable spher e confinement in standing wave trap (SWT) for arbitrary value of refractive index. For other sphere radii we show that the SWT enables confinement of high refractive index particle in wider laser beams and provides axial trap stiffness and maximal axial trapping force at least by two orders and one order bigger than in SBT, respectively.
    Permanent Link: http://hdl.handle.net/11104/0101240
     

Number of the records: 1