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Optically driven nanorotors: Experiments and model calculations

Khan, Manas and Sood, AK and Deepak, FL and Rao, CNR (2007) Optically driven nanorotors: Experiments and model calculations. In: Journal of Nanoscience and Nanotechnolgy, 7 (6). pp. 1800-1803.

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We show that asymmetric nanorods rotate under the laser radiation pressure, irrespective of the polarization of the light, when trapped in laser tweezers. If a nanorod is not quite transparent to the trapping laser radiation, the radiation pressure force generates a non zero torque on the asymmetric nanorods making them rotate at a moderate speed. Our experimental observations on radiation pressure driven rotations of MgO and Si nanorods in optical trap show that the efficiency of the rotors depends directly on their transmittance at the trapping wavelength. We propose theoretical models to estimate the rotational speed at different laser powers for a rotor with shape asymmetries or surface irregularities.

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnolgy
Publisher: American Scientific Publishers
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Aug 2007
Last Modified: 02 Feb 2012 06:28
URI: http://eprints.iisc.ac.in/id/eprint/11646

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