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Proceedings Paper

Optical tweezing beam control using liquid crystal adaptive optical elements
Author(s): Philip J. W. Hands; Svetlana A. Tatarkova; Andrew K. Kirby; Gordon D. Love
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Paper Abstract

Liquid crystal (LC) adaptive optical elements are described, which provide an alternative to existing micropositioning technologies in optical tweezing. A full description of this work is given in [1]. An adaptive LC prism supplies tip/tilt to the phase profile of the trapping beam, giving rise to an available steering radius within the x-y plane of 10 μm. Additionally, a modally addressed adaptive LC lens provides defocus, offering a z-focal range for the trapping site of 100 μm. The result is full three-dimensional positional control of trapped particle(s) using a simple and wholly electronic control system. Compared to competing technologies, these devices provide a lower degree of controllability, but have the advantage of simplicity, cost and light efficiency. Furthermore, due to their birefringence, LC elements offer the opportunity of the creation of dual optical traps with controllable depth and separation.

Paper Details

Date Published: 11 September 2006
PDF: 8 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63262U (11 September 2006); doi: 10.1117/12.679421
Show Author Affiliations
Philip J. W. Hands, Durham Univ. (United Kingdom)
Svetlana A. Tatarkova, Durham Univ. (United Kingdom)
Andrew K. Kirby, Durham Univ. (United Kingdom)
Gordon D. Love, Durham Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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