Abstract
Field symmetries and conservation laws are closely associated through Noether's theorem. Light field inhomogeneities lead to changes in linear and angular momenta and, consequently, to radiation pressure1,2, spin or rotation of objects3,4. Here we discuss a new type of mechanical action originating in the exchange between spin and orbital angular momenta. We demonstrate theoretically and experimentally that, when mirror and central symmetries of scattering are broken, a force appears acting perpendicularly to the direction of propagation. This new force completes the set of non-conservative forces (radiation pressure and tractor beams) that can be generated with unstructured light beams.
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Acknowledgements
This work was partially supported by NSF grant no. 1159530.
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S.S. and A.D. conceived the idea and designed the experiments. S.S. performed theoretical analysis. V.K. and R.R.N. performed the experiments. S.S. and V.K. contributed materials/analysis tools. S.S., V.K., R.R.N. and A.D. analysed the data. S.S. and A.D. wrote the paper.
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Sukhov, S., Kajorndejnukul, V., Naraghi, R. et al. Dynamic consequences of optical spin–orbit interaction. Nature Photon 9, 809–812 (2015). https://doi.org/10.1038/nphoton.2015.200
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DOI: https://doi.org/10.1038/nphoton.2015.200
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