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Title

Strong tangential force within a small trapping volume under near-field Laguerre-Gaussian beam illumination

Author(s)

Jia, Baohua;  Gan, Xiaosong;  Gu, Min

Abstract

Near-field rotation of a trapped particle under focused evanescent Laguerre-Gaussian beam illumination is theoretically investigated by mapping the two-dimensional transverse trapping efficiency exerting on the particle. It is revealed that the severe focal field deformation associated with a focused evanescent Laguerre-Gaussian beam causes a significant impact on the transverse trapping performance of the microparticle. Compared with the far-field trapping force, strong tangential force components have been observed in the transverse efficiency mapping, which potentially lead to rotational motions to the particle within a small trapping volume in the optical near-field.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics

Source

Optics Express, Vol. 16, no. 19 (Sep 2008), pp. 15191-15197

Publication year

2008

Keyword(s)

Computer aided design;  Conformal mapping;  Electromagnetic fields;  Electromagnetism;  Far fields;  Focal fields;  Gaussian beams;  Gaussian noise;  Illumination;  Instrumentation;  Ion beams;  Laguerre-Gaussian beams;  Lighting;  Magnetism;  Micro particles;  Near fields;  Optical near fields;  Optical tweezers;  Refractometry;  Rotational motions;  Tangential forces;  Trapped particles;  Trapping efficiencies;  Trellis codes

Publisher

Optical Society of America

ISSN

1094-4087

Publisher URL

http://dx.doi.org/10.1364/OE.16.015191

Copyright

Copyright © 2008 Optical Society of America. Published version of the paper reproduced here in accordance with the copyright policy of the publisher. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.16.015191. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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