Optical forces in a non-diffracting vortex beam

Optical forces in a non-diffracting vortex beam

Optical force acting upon a dielectric microparticle illuminated by a non-diffracting vortex beam is expressed using the generalized Lorenz–Mie theory (GLMT). Numerical results are presented for different widths and topological charges of the vortex beam. We show that such particle may be stably tra...

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Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2013-09, Vol.126, p.78-83
Main Authors: ANBiler, Martin, ZemA!nek, Pavel
Format: Article
Language:eng
Subjects:
Bessel beam
Circulation
Dielectrics
Electron beams
Generalized Lorenz–Mie theory
Mathematical models
Microparticles
Optical trapping
Optical vortex
Radiative transfer
Spectroscopy
Vortex rings
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Summary:Optical force acting upon a dielectric microparticle illuminated by a non-diffracting vortex beam is expressed using the generalized Lorenz–Mie theory (GLMT). Numerical results are presented for different widths and topological charges of the vortex beam. We show that such particle may be stably trapped either in the dark center of the vortex beam, in one of the two stable positions placed off the optical axis, or as the third option it may circulate along almost circular trajectory having its radius smaller or equal to the radius of the smallest high intensity vortex ring. ► Theoretical study of optical forces based on the generalized Lorenz–Mie theory. ► Lateral behavior of polystyrene microparticle in vortex Bessel beam. ► Stable off-axis trapping without orbital motion is predicted.
ISSN:0022-4073
1879-1352