Superadiabatic optical forces on a dipole: exactly solvable model for a vortex field

@article{Berry2014SuperadiabaticOF,
  title={Superadiabatic optical forces on a dipole: exactly solvable model for a vortex field},
  author={Michael V. Berry and Pragya Shukla},
  journal={Journal of Physics A},
  year={2014},
  volume={47},
  pages={125201}
}
The forces exerted by light on a small particle are modified by the particle's motion, giving a series of superadiabatic corrections to the lowest-order approximation in which the motion is neglected. The correction forces can be calculated recursively for an electric dipole modelled as a damped oscillator. In lowest order, there is, as is known, a non-potential though non-dissipative ?curl force?, in addition to the familiar gradient force. In the next order, there are forces of geometric… 

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