Transverse particle dynamics in a Bessel beam

Graham Milne, Kishan Dholakia, David McGloin, Karen Volke-Sepulveda, Pavel Zemánek

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)13972-13987
Number of pages16
JournalOptics Express
Issue number21
Publication statusPublished - 2007 Oct 17

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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