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8 September 2006 Modelling optical micromachines and birefringent particles
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vincent L. Y. Loke, Timo A. Nieminen, Simon J. Parkin, Agata M. Brańczyk, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop "Modelling optical micromachines and birefringent particles", Proc. SPIE 6310, Photonic Devices and Algorithms for Computing VIII, 63100I (8 September 2006);

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