Mechanical equivalence of spin and orbital angular momentum of light: an optical spanner.
作者： N. B. Simpson , K. Dholakia , L. Allen , M. J. Padgett
DOI: 10.1364/OL.22.000052
关键词: Angular momentum operator 、 Total angular momentum quantum number 、 Angular momentum coupling 、 Orbital angular momentum of light 、 Optics 、 Angular momentum of light 、 Orbital motion 、 Orbital angular momentum multiplexing 、 Physics 、 Azimuthal quantum number
摘要: 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±? 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 …
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