Abstract
We demonstrate how light force, irrespective of the polarization of the light, can be used torun a simple nanorotor. While the gradient force of a single beam optical trap is used tohold an asymmetric nanorod, we utilize the scattering force to generate a torque on thenanorod, making it rotate about the optic axis. The inherent textural irregularities ormorphological asymmetries of the nanorods give rise to the torque under the radiationpressure. Even a small surface irregularity with non-zero chirality is sufficient to produceenough torque for moderate rotational speed. Different sized rotors can be used toset the speed of rotation over a wide range with fine tuning possible throughthe variation of the laser power. We present a simple dimensional analysis toqualitatively explain the observed trend of the rotational motion of the nanorods.
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