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

0205627 - UPT-D 20030009 RIV NL eng J - Článek v odborném periodiku
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. E-ISSN 1873-0310
Grant CEP: GA ČR GA101/00/0974
Výzkumný záměr: CEZ:AV0Z2065902
Klíčová slova: single beam trap * optical trapping * optical tweezers
Kód oboru RIV: BH - Optika, masery a lasery
Impakt faktor: 1.482, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0101240