Khan, Manas ; Sood, A. K. ; Deepak, F. L. ; Rao, C. N. R. (2006) Nanorotors using asymmetric inorganic nanorods in an optical trap Nanotechnology, 17 (11). S287-S290. ISSN 0957-4484
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Official URL: http://iopscience.iop.org/0957-4484/17/11/S10
Related URL: http://dx.doi.org/10.1088/0957-4484/17/11/S10
Abstract
We demonstrate how light force, irrespective of the polarization of the light, can be used to run a simple nanorotor. While the gradient force of a single beam optical trap is used to hold an asymmetric nanorod, we utilize the scattering force to generate a torque on the nanorod, making it rotate about the optic axis. The inherent textural irregularities or morphological asymmetries of the nanorods give rise to the torque under the radiation pressure. Even a small surface irregularity with non-zero chirality is sufficient to produce enough torque for moderate rotational speed. Different sized rotors can be used to set the speed of rotation over a wide range with fine tuning possible through the variation of the laser power. We present a simple dimensional analysis to qualitatively explain the observed trend of the rotational motion of the nanorods.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics. |
ID Code: | 44718 |
Deposited On: | 23 Jun 2011 05:56 |
Last Modified: | 03 Oct 2011 14:32 |
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