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Note on the helicity decomposition of spin and orbital optical currents

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Aiello,  Andrea
Optical Quantum Information Theory, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Aiello, A., & Berry, M. V. (2015). Note on the helicity decomposition of spin and orbital optical currents. JOURNAL OF OPTICS, 17(6): 062001. doi:10.1088/2040-8978/17/6/062001.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-63BA-B
Abstract
In the helicity representation, the Poynting vector (current) for a monochromatic optical field, when calculated using either the electric or the magnetic field, separates into right-handed and left-handed contributions, with no cross-helicity contributions. Cross-helicity terms do appear in the orbital and spin contributions to the current. But when the electric and magnetic formulas are averaged ('electric-magnetic democracy'), these terms cancel, restoring the separation into right-handed and left-handed currents for orbital and spin separately.