Rayleigh Dielectric Particle Research Articles

Analysis of optical trapping and propulsion of Rayleigh particles using Airy beam

The radiation forces and trajectories of Rayleigh dielectric particles induced by one-dimensional Airy beam were numerically analyzed. Results show that the Airy beam drags particles into the optical intensity peaks, and guides particles vertically along parabolic trajectories. Viscosity of surrounding medium significantly affects the trajectories. Random Brownian force affects the trajectories. Meanwhile, trapping potential depths and minimum trapping particle radii in different potential wells were also discussed. The trapping stability could be improved by increasing either the input peak intensity or the particle radius.

Radiation forces of a focused partially coherent flattened vortex beam on a Rayleigh spherical particle

A focused partially coherent flattened vortex beam used to trap a Rayleigh dielectric spherical particle with relative refractive index p < 1 is studied. The dependence of radiation forces (RFs) on the beam order N, waist width w 0 , correlation length σ 0, particle radius a and focal length f is analyzed and illustrated by numerical examples. By a suitable choice of N, w 0 , σ 0 and f a stable trap of the Rayleigh particle is achievable. In particular, there exist critical values w 0 , c , σ 0,c for a partially coherent flattened vortex beam the particle can be trapped by the beam with w 0 less than w 0 , c and σ 0 larger than σ 0,c. A comparison with the previous work is made.

Radiation forces on a Rayleigh dielectric sphere in a patterned optical near field

We report on the study of the radiation forces exerted on a Rayleigh dielectric particle by a patterned optical near-field landscape at an interface decorated with resonant gold nanostructures. This configuration allows for the generation of a large array of surface subwavelength optical traps from an extended collimated beam, which may be of interest for parallel optical manipulation and sorting of submicrometer objects.