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- W2568397788 abstract "The theory of photokinetic effects expresses the forces and torques exerted by a beam of light in terms of experimentally accessible amplitude and phase profiles. We use this formalism to develop an intuitive explanation for the performance of optical tweezers operating in the Rayleigh regime, including effects arising from the influence of light’s angular momentum. First-order dipole contributions reveal how a focused beam can trap small objects, and what features limit the trap’s stability. The first-order force separates naturally into a conservative intensity-gradient term that forms a trap and a non-conservative solenoidal term that drives the system out of thermodynamic equilibrium. Neither term depends on the light’s polarization; light’s spin angular momentum plays no role at dipole order. Polarization-dependent effects, such as trap-strength anisotropy and spin-curl forces, are captured by the second-order dipole-interference contribution to the photokinetic force. The photokinetic expansion thus illuminates how light’s angular momentum can be harnessed for optical micromanipulation, even in the most basic optical traps. This article is part of the themed issue ‘Optical orbital angular momentum’." @default.
- W2568397788 created "2017-01-13" @default.
- W2568397788 creator A5016483586 @default.
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- W2568397788 date "2017-02-28" @default.
- W2568397788 modified "2023-10-06" @default.
- W2568397788 title "Photokinetic analysis of the forces and torques exerted by optical tweezers carrying angular momentum" @default.
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- W2568397788 doi "https://doi.org/10.1098/rsta.2015.0432" @default.
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