Controlled rotation of optically trapped microscopic particles

L. Paterson, M. P. MacDonald, J. Arlt, W. Sibbett, P. E. Bryant, K. Dholakia

    Research output: Contribution to journalArticlepeer-review

    973 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 - May 2001


    • Optical rotation
    • Micromanipulation
    • Optical tweezers
    • Lasers and laser optics


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