Abstract

The optical forces and intrinsic optical torque of a highly focused radially polarized beam on a Rayleigh spheroidal particle are calculated with the dipole approximation. Numerical results show that the maximal trapping forces depend strongly on the orientation of the particle, and the torque is always perpendicular to the plane containing the major axis of the spheroid and the optical axis. As a result of optical mechanical and torque equilibrium, the spheroidal particle will stay at the focus with its major axis of the spheroid parallel to the optical axis.

© 2015 Optical Society of America

Optical trapping force and torque on spheroidal Rayleigh particles with arbitrary spatial orientations

Manman Li, Shaohui Yan, Baoli Yao, Yansheng Liang, Guoxia Han, and Peng Zhang
J. Opt. Soc. Am. A 33(7) 1341-1347 (2016)

Optical trapping of spheroidal particles in Gaussian beams

Stephen H. Simpson and Simon Hanna
J. Opt. Soc. Am. A 24(2) 430-443 (2007)

Intrinsic optical torque of cylindrical vector beams on Rayleigh absorptive spherical particles

Manman Li, Shaohui Yan, Baoli Yao, Ming Lei, Yanlong Yang, Junwei Min, and Dan Dan
J. Opt. Soc. Am. A 31(8) 1710-1715 (2014)

Optical Bessel tractor beam on active dielectric Rayleigh prolate and oblate spheroids

F. G. Mitri
J. Opt. Soc. Am. B 34(5) 899-908 (2017)

Radiation forces on a Rayleigh particle by highly focused radially polarized beams modulated by DVL

Ruili Zhang, Ziyang Chen, Jixiong Pu, and P. H. Jones
J. Opt. Soc. Am. A 32(5) 797-802 (2015)