Optical momentum distributions in monochromatic, isotropic random vector fields
Journal of Optics(2023)
摘要
We investigate the decomposition of the electromagnetic Poynting momentum
density in three-dimensional random monochromatic fields into orbital and spin
parts, using analytical and numerical methods. In sharp contrast with the
paraxial case, the orbital and spin momenta in isotropic random fields are
found to be identically distributed in magnitude, increasing the discrepancy
between the Poynting and orbital pictures of energy flow. Spatial correlation
functions reveal differences in the generic organization of different optical
momenta in complex natural light fields, with the orbital current typically
forming broad channels of unidirectional flow, and the spin current manifesting
larger vorticity and changing direction over subwavelength distances. These
results are extended to random fields with pure helicity, in relation to the
inclusion of electric-magnetic democracy in the definition of optical momenta.
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