Modelling optical micromachines and birefringent particles

Loke, Vincent L. Y., Nieminen, Timo A., Parkin, Simon J., Branczyk, Agata M., Heckenberg, Norman R. and Rubinsztein-Dunlop, Halina (2006). Modelling optical micromachines and birefringent particles. In: Khan M. Iftekharuddin and Abdul A. S. Awwal, Proceedings of SPIE. Photonic Devices and Algorithms for Computing VIII, San Diego, CA, USA, (63100I-1-63100I-9). 14 August 2006. doi:10.1117/12.680455

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Author Loke, Vincent L. Y.
Nieminen, Timo A.
Parkin, Simon J.
Branczyk, Agata M.
Heckenberg, Norman R.
Rubinsztein-Dunlop, Halina
Title of paper Modelling optical micromachines and birefringent particles
Conference name Photonic Devices and Algorithms for Computing VIII
Conference location San Diego, CA, USA
Conference dates 14 August 2006
Proceedings title Proceedings of SPIE   Check publisher's open access policy
Journal name Photonic Devices and Algorithms for Computing VIII   Check publisher's open access policy
Place of Publication Bellingham, Washington, U.S.A.
Publisher SPIE - International Society for Optical Engineering
Publication Year 2006
Year available 2006
Sub-type Fully published paper
DOI 10.1117/12.680455
Open Access Status File (Publisher version)
ISBN 0-8194-6389-2
ISSN 0277-786X
Editor Khan M. Iftekharuddin
Abdul A. S. Awwal
Volume 6310
Start page 63100I-1
End page 63100I-9
Total pages 9
Language eng
Abstract/Summary A strongly focused laser beam can be used to trap, manipulate and exert torque on a microparticle. The torque is the result of transfer of angular momentum from the laser beam. The laser could be used to drive a rotor, impeller, cog wheel, etc. of a few microns in size, perhaps fabricated from a birefringent material. We review our methods of computationally simulating the torque and force imparted by a laser beam. We introduce a method of hybridizing the T-matrix with the finite difference frequency domain (FDFD) method to allow the simulation of materials that are anisotropic and inhomogeneous, and structures that have complex shapes. We also employ an alternative discrete dipole approximation method. The high degree of symmetry of a microrotor, such as rotational periodicity, could be exploited to reduce computational time and memory requirements by orders of magnitude. This is achieved by performing calculations for only a given segment that is repeated across the whole structure. This can demonstrated by modeling the optical trapping and rotation of a cube.
Subjects 240504 Electrostatics and Electrodynamics
240400 Optical Physics
Keyword optical tweezers
optical torque
Q-Index Code E1
Institutional Status UQ

Document type: Conference Paper
Sub-type: Fully published paper
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Created: Mon, 23 Oct 2006, 10:00:00 EST by Timo Nieminen on behalf of School of Mathematics & Physics