Force and torque on an electric dipole by spinning light fields

A Canaguier-Durand, A Cuche, C Genet… - Physical Review A …, 2013 - APS
Physical Review A—Atomic, Molecular, and Optical Physics, 2013APS
We calculate the optical force and torque applied to an electric dipole by a spinning light
field. We find that the dissipative part of the force depends on the orbital energy flow of the
field only, because the latter is related to the phase gradient generalized for such a light
field. As for the remaining spin energy flow, it gives rise to an optical torque. The resulting
change in the optical force is detailed for different experimentally relevant configurations,
and we show in particular how this change is critical when surface plasmon modes are …
We calculate the optical force and torque applied to an electric dipole by a spinning light field. We find that the dissipative part of the force depends on the orbital energy flow of the field only, because the latter is related to the phase gradient generalized for such a light field. As for the remaining spin energy flow, it gives rise to an optical torque. The resulting change in the optical force is detailed for different experimentally relevant configurations, and we show in particular how this change is critical when surface plasmon modes are involved.
American Physical Society
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