Controlled rotation of optically trapped microscopic particles

Lynn Paterson, Michael P MacDonald, J. Arlt, W. Sibbett, P. E. Bryant, K. Dholakia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

958 Citations (Scopus)


We demonstrate controlled rotation of optically trapped objects in a spiral interference pattern. This pattern is generated by interfering an annular shaped laser beam with a reference beam. Objects are trapped in the spiral arms of the pattern. Changing the optical path length causes this pattern, and thus the trapped objects, to rotate. Structures of silica microspheres, microscopic glass rods, and chromosomes are set into rotation at rates in excess of 5 hertz. This technique does not depend on intrinsic properties of the trapped particle and thus offers important applications in optical and biological micromachines.

Original languageEnglish
Pages (from-to)912-914
Number of pages3
Issue number5518
Publication statusPublished - 4 May 2001

ASJC Scopus subject areas

  • General


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