Optical forces arising from phase gradients

Details Optical forces arising from phase gradients Optical forces arising from phase gradients

2007-03-21

arxiv.org/abs/cond-mat/0703543v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.013602

We demonstrate both theoretically and experimentally that gradients in the phase of a light field exert forces on illuminated objects, including forces transverse to the direction of propagation. This effect generalizes the notion of the photon orbital angular momentum carried by helical beams of light. We further demonstrate that these forces generally violate conservation of energy, and briefly discuss some ramifications of their non-conservativity.

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