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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5194

Title: Accurate measurement of microscopic forces and torques using optical tweezers
Authors: McLaren, M
Sidderas-Haddad, E
Forbes, A
Keywords: Optical fields
Optical tweezers
Vortes laser beams
Lasers
Microscopic forces
Issue Date: Sep-2011
Publisher: Academy of Science of South Africa (ASSAf)
Citation: McLaren, M, Sidderas-Haddad, E and Forbes, A. 2011. Accurate measurement of microscopic forces and torques using optical tweezers. South African Journal of Science, Vol 107(9/10), pp 8
Series/Report no.: Workflow request;7348
Abstract: It is now well known that matter may be trapped by optical fields with high intensity gradients. Once trapped, it is then possible to manipulate microscopic particles using such optical fields, in so-called optical tweezers. Such optical trapping and tweezing systems have found widespread application across diverse fields in science, from applied biology to fundamental physics. In this article the authors outline the design and construction of an optical trapping and tweezing system, and show how the resulting interaction of the laser light with microscopic particles may be understood in terms of the transfer of linear and angular momentum of light. The authors demonstrate experimentally the use of our optical tweezing configuration for the measurement of microscopic forces and torques. In particular, they make use of digital holography to create so-called vortex laser beams, capable of transferring orbital angular momentum to particles. The use of such novel laser beams in an optical trapping and tweezing set-up allows for the control of biological species at the single-cell level.
Description: Copyright: 2011 Academy of Science of South Africa (ASSAf)
URI: http://www.sajs.co.za/index.php/SAJS/article/view/579
http://hdl.handle.net/10204/5194
ISSN: 0038-2353
Appears in Collections:Laser physics and technology
General science, engineering & technology

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