Journal
OPTICS COMMUNICATIONS
Volume 220, Issue 4-6, Pages 401-412Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0030-4018(03)01409-3
Keywords
single beam trap; optical trapping; optical tweezers; standing wave; Mie scattering; Gaussian laser beam
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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 sphere 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. (C) 2003 Elsevier Science B.V. All rights reserved.
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