Manipulating particles with light: radiation and gradient forces

Bradshaw, David S. and Andrews, David L. (2017) Manipulating particles with light: radiation and gradient forces. European Journal of Physics, 38 (3). ISSN 0143-0807

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    Abstract

    The manipulation of matter with electromagnetic radiation is a capacity that has been known for over a century. However, the prominence of such optical effects only grew rapidly following the invention of optical tweezers in the 1980s. While both the original theory and the early trapping techniques are based on the radiation force, optical tweezing uses the gradient force. This paper aims to differentiate between these two clearly distinct types of optical forces, which are sometimes confused in the literature. We also discuss three completely separate forms of optical torque that can be applied to a particle, also due to an electromagnetic field. These involve the transfer of either spin or orbital angular momentum from the beam to the particle, depending on the character of the light, or the often overlooked alignment effect that can act on a cylindrical particle due to a gradient force.

    Item Type: Article
    Uncontrolled Keywords: optical trap,optical tweezers,optical force
    Faculty \ School: Faculty of Science > School of Chemistry
    Related URLs:
    Depositing User: Pure Connector
    Date Deposited: 10 Mar 2017 01:41
    Last Modified: 09 Apr 2019 11:58
    URI: https://ueaeprints.uea.ac.uk/id/eprint/62936
    DOI: 10.1088/1361-6404/aa6050

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