Electromagnetic fields are represented as polarization tensor radiances assigned to rays. The field's intensity, Poynting vector, and polarization are expressible in terms of sums of these tensors for all rays through a point.
© 2005 Optical Society of America
M. A. Alonso, "Exact Ray-Based Representation of the Polarization of Nonparaxial Electromagnetic Fields," in Frontiers in Optics, OSA Technical Digest Series (Optical Society of America, 2005), paper JTuC16.
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