title: Transverse particle dynamics in a Bessel beam.
abstract: Spatially periodic optical fields can be used to sort dielectric microscopic particles as a function of size, shape or refractive index. In this paper we elucidate through both theory and experiment the behavior of silica microspheres moving under the influence of the periodic optical field provided by a Bessel beam. We compare two different computational models, one based on Mie scattering, the other on geometrical ray optics and find good qualitative agreement, with both models predicting the existence of distinct size-dependent phases of particle behavior. We verify these predictions by providing experimental observations of the individual behavioral phases.
authors: Graham
authors: G
authors: Milne
authors: Kishan
authors: K
authors: Dholakia
authors: David
authors: D
authors: McGloin
authors: Karen
authors: K
authors: Volke-Sepulveda
authors: Pavel
authors: P
authors: Zemánek