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Numerical study on dynamical behavior of nanoparticles in optical vortex
Author(s): Ryo Nagura; Tempei Tsujimura; Satoyuki Kawano
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Paper Abstract

When nanoparticles are exposed to an optical field with orbital angular momentum, that is optical vortex, such particles are swirled around optical axis. Although such a phenomenon was observed experimentally, theoretical and numerical approaches have not been developed enough. In this study, we propose a numerical model for dynamical motions of a single nanoparticle. Based on Rayleigh scattering regime, the gradient force which dominantly acts on a nanoparticle is computed. The gradient force is usually derived from time averaged electric field and then, a tangential component is vanished. Herein, we carefully treat the tangential term by using time dependent electromagnetic fields. Consequently, it is found that a tangential component in the gradient force induce swirling motions of a nanoparticle.

Paper Details

Date Published: 24 April 2018
PDF: 2 pages
Proc. SPIE 10712, Optical Manipulation Conference, 107121C (24 April 2018); doi: 10.1117/12.2319445
Show Author Affiliations
Ryo Nagura, Osaka Univ. (Japan)
Tempei Tsujimura, Osaka Univ. (Japan)
Satoyuki Kawano, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 10712:
Optical Manipulation Conference
Takashige Omatsu; Hajime Ishihara; Keiji Sasaki, Editor(s)

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