Optically driven nanorotors: experiments and model calculations

Khan, Manas ; Sood, A. K. ; Deepak, F. Leonard ; Rao, C. N. R. (2007) Optically driven nanorotors: experiments and model calculations Journal of Nanoscience and Nanotechnology, 7 (6). pp. 1800-1803. ISSN 1533-4880

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Official URL: http://www.ingentaconnect.com/search/article?optio...

Related URL: http://dx.doi.org/10.1166/jnn.2007.719


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:Article
Source:Copyright of this article belongs to American Scientific Publishers.
Keywords:Nanorotor; Rotation in Optical Trap; Radiation Pressure Torque; MgO-Si Nanorods
ID Code:54810
Deposited On:12 Aug 2011 12:51
Last Modified:12 Aug 2011 12:51

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