| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Optical Torque Exerted on a Rotator under Illumination of a Vortex Beam |
| LI Dong-Hua1,2, PU Ji-Xiong1**, WANG Xi-Qing2 |
1College of Information Science & Engineering, Huaqiao University, Xiamen 361021
2 College of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031 |
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| Cite this article: |
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LI Dong-Hua, PU Ji-Xiong, WANG Xi-Qing 2012 Chin. Phys. Lett. 29 064205 |
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Abstract We investigate the torque on a specially shaped rotator produced by a vortex beam. The formulas for the torque along x, y and z directions are derived, and numerical calculation is performed. It is found that for the specially shaped rotator, the torque brought by the Laguerre–Gauss (LG) vortex beam is dependent upon the angle of the facet for each part of the rotator, and the topological charge of the vortex beam. It is shown that torque is generated from both the light momentum and orbital angular momentum (OAM) of the incident vortex beam, indicating that we can control the rotation of the rotator by modulating the OAM of the incident light beam.
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Received: 08 December 2011
Published: 31 May 2012
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| PACS: |
42.50.Tx
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(Optical angular momentum and its quantum aspects)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.15.Dp
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(Wave fronts and ray tracing)
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