The angular momentum of light: optical spanners and the rotational frequency shift |
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| Authors: | Padgett M J Allen L |
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| Institution: | (1) The School of Physics and Astronomy, The University of St Andrews, Fife, UK |
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| Abstract: | An introduction is given to the concepts of the spin and orbital angular momentum of light beams. Both spin and orbital angular momentum can be transferred from a light beam to particles held within optical tweezers, so forming an optical spanner. Each also give rise to a frequency shift when the light beam is rotated. This arises because quarter or half-wave plates and  /2 or mode converters play equivalent roles for spin and orbital angular momentum respectively. |
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