Optical trapping and moving of microparticles by using asymmetrical Laguerre–Gaussian beams

Alexey A. Kovalev; Victor V. Kotlyar; Alexey P. Porfirev

doi:10.1364/OL.41.002426

Optics Letters
Vol. 41,
Issue 11,
pp. 2426-2429
(2016)
•https://doi.org/10.1364/OL.41.002426

Optical trapping and moving of microparticles by using asymmetrical Laguerre–Gaussian beams

Alexey A. Kovalev, Victor V. Kotlyar, and Alexey P. Porfirev

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Alexey A. Kovalev, Victor V. Kotlyar, and Alexey P. Porfirev, "Optical trapping and moving of microparticles by using asymmetrical Laguerre–Gaussian beams," Opt. Lett. 41, 2426-2429 (2016)

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Abstract

We considered a generalization of the Laguerre–Gaussian (LG) laser beam family by using a complex shift of the beam complex amplitude in Cartesian coordinates. In this case, LG-beams lose their axial symmetry. The normalized orbital angular momentum is the sum of the beam topological charge and the term which is in square dependence on the asymmetry parameter. By optical trapping and moving the polystyrene microspheres in the focus of the asymmetric LG-beam, it is proven that the velocity of the microspheres increases with increasing the asymmetry parameter and constant topological charge.

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Supplementary Material (2)

Name	Description
Visualization 1: AVI (9250 KB)	Motion of three microspheres, trapped by using the aLG-beam with n = 3, x0 = 0.1w = -iy0.
Visualization 2: AVI (684 KB)	Motion of a microsphere, trapped by using the aLG-beam with n = 3, x0 = 0.4w = -iy0.

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Equations (8)

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$x_{0} / w = - {i y}_{0} / w$	0.0	0.1	0.2	0.3	0.4	0.5
$\frac{{J_{z} / W \|}_{x_{0}}}{{J_{z} / W \|}_{x_{0} = 0}}$	1.00	1.03	1.10	1.19	1.31	1.43

$x_{0} / w = - {i y}_{0} / w$	0.0	0.1	0.2	0.3	0.4	0.5
${v \|}_{x_{0}} / {v \|}_{x_{0} = 0}$	1.0	$1.2 \pm 0.2$	$1.3 \pm 0.2$	$1.4 \pm 0.3$	$1.6 \pm 0.3$	$1.8 \pm 0.3$

$x_{0} / w = - {i y}_{0} / w$	0.0	0.1	0.2	0.3	0.4	0.5
${a \|}_{x_{0}} / {a \|}_{x_{0} = 0}$	1.0	$1.2 \pm 0.2$	$1.3 \pm 0.2$	$1.3 \pm 0.3$	$1.4 \pm 0.3$	$1.6 \pm 0.3$

$x_{0} / w = - {i y}_{0} / w$	0.0	0.1	0.2	0.3	0.4	0.5
$\frac{{J_{z} / W \|}_{x_{0}}}{{J_{z} / W \|}_{x_{0} = 0}}$	1.00	1.03	1.10	1.19	1.31	1.43

$x_{0} / w = - {i y}_{0} / w$	0.0	0.1	0.2	0.3	0.4	0.5
${v \|}_{x_{0}} / {v \|}_{x_{0} = 0}$	1.0	$1.2 \pm 0.2$	$1.3 \pm 0.2$	$1.4 \pm 0.3$	$1.6 \pm 0.3$	$1.8 \pm 0.3$

Abstract

Supplementary Material (2)

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Equations (8)

Optics Letters