Scattering of inhomogeneous circularly polarized optical field and mechanical manifestation of the internal energy flows

Details Scattering of inhomogeneous circularly polarized optical field and mechanical manifestation of the internal energy flows Scattering of inhomogeneous circularly polarized optical field and mechanical manifestation of the internal energy flows

2012-04-19

arxiv.org/abs/1204.4295v1

Physics

Optics

17 pages, 5 figures

Scientific paper

Basing on the Mie theory and on the incident beam model via superposition of two plane waves, we analyze numerically the momentum flux of the field scattered by a spherical microparticle placed within the spatially inhomogeneous circularly polarized paraxial light beam. The asymmetry between the forward- and backward-scattered momentum fluxes in the Rayleigh scattering regime is revealed that appears due to the spin part of the internal energy flow in the incident beam. The transverse ponderomotive forces exerted on dielectric and conducting particles of different sizes are calculated, and special features of the mechanical actions produced by the spin and orbital parts of the internal energy flow have been recognized. In particular, the transverse orbital flow exerts on a subwavelength particle the transverse force that grows as a^3 for conducting and as a^6 for dielectric particle with radius a, in compliance with the dipole mechanism of the field-particle interaction; the force associated with the spin flow behaves as a^8 in both cases, which testifies for the non-dipole mechanism. The results can be used for experimental identification and separate investigation of the spin and orbital parts of the internal energy flow in light fields.

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