4.3 Article

Optical manipulation of optical vortex beam on gold nanoparticle

期刊

JOURNAL OF MECHANICS
卷 38, 期 -, 页码 552-559

出版社

OXFORD UNIV PRESS
DOI: 10.1093/jom/ufac047

关键词

optical force; optical torque; spin-orbit interaction; surface plasmon resonance

资金

  1. Ministry of Science and Technology, Taiwan [MOST 110-2221-E-182-038-MY2, 110-2221-E182-039-MY3, 109-2221-E-002-208, 110-2221-E-002-151]
  2. Chang Gung Memorial Hospital [CIRPD2I0023]

向作者/读者索取更多资源

This study theoretically investigates the optomechanical manipulation of an optical vortex beam (Bessel beam) on a single gold nanoparticle. The interaction between the structured light and the gold nanoparticle results in a specific stable circular orbit on the nanoparticle's surface. The spin direction of the nanoparticle is determined by the handedness of the light.
The optomechanical manipulation of an optical vortex beam (Bessel beam) upon a single gold nanoparticle (GNP) was studied theoretically. This structured light carries spin angular momentum (SAM) and orbital angular momentum (OAM) simultaneously via the spin-orbit interaction (SOI) of light. Due to the plasmon-enhanced light absorption and scattering of GNP, the SAM and OAM of photons are transferred to GNP, exhibited by the spin and orbital motions of GNP. The optical force and torque upon GNP are analyzed through the surface integrals of Maxwell's stress tensor. We found that there are specific stable circular orbits of GNP through the simulation of GNP's equation of motion; the revolution direction depends on the sign of the order of Bessel beam. If the order of Bessel beam is a positive integer, the GNP performs an orbital motion with a counterclockwise revolution. On the contrary, for a Bessel beam of a negative order, a clockwise revolution of GNP is induced. Additionally, the spin direction of GNP depends on the handedness of light: right-hand or left-hand circular polarization.

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