Simpson, NB, Dholakia, K, Allen, L, and Padgett, MJ (1997) Mechanical Equivalence Of Spin And Orbital Angular Momentum Of Light: An Optical Spanner. Optics Letters, 22 (1). pp. 52-54. ISSN 0146-9592 (doi:10.1364/OL.22.000052)
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We use a Laguerre-Gaussian laser mode within an optical tweezers arrangement to demonstrate the transfer of the orbital angular momentum of a laser mode to a trapped particle. The particle is optically confined in three dimensions and can be made to rotate; thus the apparatus is an optical spanner. We show that the spin angular momentum of +/- (h) over bar per photon associated with circularly polarized light can add to, or subtract from, the orbital angular momentum to give a total angular momentum. The observed cancellation of the spin and orbital angular momentum shows that, as predicted, a Laguerre-Gaussian mode with an azimuthal mode index l = 1 has a well-defined orbital angular momentum corresponding to (h) over bar per photon.
|Glasgow Author(s):||Padgett, Prof Miles|
|Authors:||Simpson, NB, Dholakia, K, Allen, L, and Padgett, MJ|
|College/School:||College of Science and Engineering > School of Physics and Astronomy|
|Journal Name:||Optics Letters|
|Journal Abbr.:||Opt. Lett.|