Khan, Manas and Sood, A. K. and Deepak, F. Leonard and Rao, C. N. R. (2007) Optically Driven Nanorotors: Experiments and Model Calculations. Journal of NANOSCIENCE and NANOTECHNOLOGY, 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.
|Subjects:||Material Science > Nanochemistry|
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||20 Jan 2009 10:56|
|Last Modified:||02 Mar 2009 09:21|
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