Use of shape induced birefringence for rotation in optical tweezers

Asavei, Theodor, Nieminen, Timo A., Heckenberg, Norman R. and Rubinsztein-Dunlop, Halina (2010). Use of shape induced birefringence for rotation in optical tweezers. In: Kishan Dholakia and Gabriel C. Spalding, Proceedings of SPIE: Optical Trapping and Optical Micromanipulation VII. SPIE Optics + Photonics 2010: Optical Trapping and Optical Micromanipulation VII, San Diego, CA, U.S.A., (77621C-1-77621C-8). 1-5 August 2010. doi:10.1117/12.861793

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Author Asavei, Theodor
Nieminen, Timo A.
Heckenberg, Norman R.
Rubinsztein-Dunlop, Halina
Title of paper Use of shape induced birefringence for rotation in optical tweezers
Conference name SPIE Optics + Photonics 2010: Optical Trapping and Optical Micromanipulation VII
Conference location San Diego, CA, U.S.A.
Conference dates 1-5 August 2010
Convener Society of Photo-Optical Instrumentation Engineers (SPIE)
Proceedings title Proceedings of SPIE: Optical Trapping and Optical Micromanipulation VII   Check publisher's open access policy
Journal name Optical Trapping and Optical Micromanipulation VII   Check publisher's open access policy
Place of Publication Bellingham, WA, U.S.A.
Publisher SPIE
Publication Year 2010
Sub-type Fully published paper
DOI 10.1117/12.861793
Open Access Status File (Publisher version)
ISBN 9780819482587
0819482587
ISSN 0277-786X
Editor Kishan Dholakia
Gabriel C. Spalding
Volume 7762
Start page 77621C-1
End page 77621C-8
Total pages 8
Collection year 2011
Language eng
Formatted Abstract/Summary
Since a light beam can carry angular momentum (AM) it is possible to use optical tweezers to exert torques to twist or rotate microscopic objects. The alignment torque exerted on an elongated particle in a polarized light field represents a possible torque mechanism. In this situation, although some exchange of orbital angular momentum occurs, scattering calculations show that spin dominates, and polarization measurements allow the torque to be measured with good accuracy. This phenomenon can be explained by considering shape birefringence with an induced polarizability tensor. Another example of a shape birefringent object is a microsphere with a cylindrical cavity. Its design is based on the fact that due to its symmetry a sphere does not rotate in an optical trap, but one could break the symmetry by designing an object with a spherical outer shape with a non spherical cavity inside. The production of such a structure can be achieved using a two photon photo-polymerization technique. We show that using this technique, hollow spheres with varying sizes of the cavity can be successfully constructed. We have been able to demonstrate rotation of these spheres with cylindrical cavities when they are trapped in a laser beam carrying spin angular momentum. The torque efficiency achievable in this system can be quantified as a function of a cylinder diameter. Because they are biocompatible and easily functionalized, these structures could be very useful in work involving manipulation, control and probing of individual biological molecules and molecular motors.
Copyright © 2010, Society of Photo-Optical Instrumentation Engineers
Keyword Two-photon photopolymerization
Optical tweezers
Optical torque
Form birefringence
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Presented during and published under "Session 9: Jump, Twist, and Shout" as Paper 7762-1C.

Document type: Conference Paper
Collections: School of Mathematics and Physics
Official 2011 Collection
 
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Created: Tue, 15 Mar 2011, 14:40:07 EST by Jo Hughes on behalf of Physics