Manipulation and filtration of low index particles with holographic Laguerre-Gaussian optical trap arrays

P. A. Prentice, M. P. MacDonald, T. G. Frank, A. Cuschieri, G. C. Spalding, W. Sibbett, P. A. Campbell, K. Dholakia

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Abstract

Multiple low index particles (micrometer-sized ultrasound contrast agent), have been optically trapped using a 4 × 4 Laguerre-Gaussian trap array. The trapping efficiency of the Laguerre-Gaussian arrangement was measured using a Stokes' flow approach whereby the critical relative fluid velocity required to remove particles from the optical trap was measured. The dependence of trapping efficiency on beam power was also explored and the optimum beam parameters were identified. Finally, the utility of the array as a selective filter was demonstrated by tweezing multiple low-index particles from a population exhibiting an inherent distribution in size. This procedure represents a unique remote non-contact process that may have significant applicability throughout the fields of biophysics and biotechnology.

Original languageEnglish
Pages (from-to)593-600
Number of pages8
JournalOptics Express
Volume12
Issue number4
DOIs
Publication statusPublished - 2004 Feb

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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    Prentice, P. A., MacDonald, M. P., Frank, T. G., Cuschieri, A., Spalding, G. C., Sibbett, W., Campbell, P. A., & Dholakia, K. (2004). Manipulation and filtration of low index particles with holographic Laguerre-Gaussian optical trap arrays. Optics Express, 12(4), 593-600. https://doi.org/10.1364/OPEX.12.000593