Optical Torque Exerted on a Rotator under Illumination of a Vortex Beam

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...

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Bibliographic Details
Published inChinese physics letters Vol. 29; no. 6; pp. 64205 - 1-064205-4
Main Authors Li, Dong-Hua, Pu, Ji-Xiong, Wang, Xi-Qing
Format Journal Article
LanguageEnglish
Published 01.06.2012
Subjects
Angular momentum
Charge
Electron beams
Illumination
Incident light
Mathematical analysis
Mathematical models
Torque
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Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/29/6/064205