dorsal/arxiv
View SchemaModelling optical micro-machines
| Authors | Vincent L. Y. Loke, Timo A. Nieminen, Agata M. Branczyk, Norman R. Heckenberg, Halina Rubinsztein-Dunlop |
|---|---|
| Categories | |
| ArXiv ID | physics/0607286 |
| URL | https://arxiv.org/abs/physics/0607286 |
| Journal | pp. 163-166 in Nikolai Voshchinnikov (ed.), 9th International Conference on Electromagnetic and Light Scattering by Non-Spherical Particles: Theory, Measurements, and Applications (St. Petersburg State University, St. Petersburg, 2006) |
Abstract
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 by scattering of the laser beam. The laser could be used to drive a rotor, impeller, cog wheel or some other microdevice 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 modelling of materials that are anisotropic and inhomogeneous, and structures that have complex shapes. The high degree of symmetry of a microrotor, such as discrete or continuous rotational symmetry, can be exploited to reduce computational time and memory requirements by orders of magnitude. This is achieved by performing calculations for only a given segment or plane that is repeated across the whole structure. This can be demonstrated by modelling the optical trapping and rotation of a cube.
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"abstract": "A strongly focused laser beam can be used to trap, manipulate and exert\ntorque on a microparticle. The torque is the result of transfer of angular\nmomentum by scattering of the laser beam. The laser could be used to drive a\nrotor, impeller, cog wheel or some other microdevice of a few microns in size,\nperhaps fabricated from a birefringent material. We review our methods of\ncomputationally simulating the torque and force imparted by a laser beam. We\nintroduce a method of hybridizing the T-matrix with the Finite Difference\nFrequency Domain (FDFD) method to allow the modelling of materials that are\nanisotropic and inhomogeneous, and structures that have complex shapes. The\nhigh degree of symmetry of a microrotor, such as discrete or continuous\nrotational symmetry, can be exploited to reduce computational time and memory\nrequirements by orders of magnitude. This is achieved by performing\ncalculations for only a given segment or plane that is repeated across the\nwhole structure. This can be demonstrated by modelling the optical trapping and\nrotation of a cube.",
"arxiv_id": "physics/0607286",
"authors": [
"Vincent L. Y. Loke",
"Timo A. Nieminen",
"Agata M. Branczyk",
"Norman R. Heckenberg",
"Halina Rubinsztein-Dunlop"
],
"categories": [
"physics.optics",
"physics.comp-ph"
],
"journal_ref": "pp. 163-166 in Nikolai Voshchinnikov (ed.), 9th International\n Conference on Electromagnetic and Light Scattering by Non-Spherical\n Particles: Theory, Measurements, and Applications (St. Petersburg State\n University, St. Petersburg, 2006)",
"title": "Modelling optical micro-machines",
"url": "https://arxiv.org/abs/physics/0607286"
},
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