Frank
Mixing between particle kinetic states or streams is the core of physical Inertial Frame Transitions in the DFM. The Navier-Stokes (unsolvable) magnetohydrodynamic equations apply to all shock turbulence. But the real revalation is applying this mechanism to the 'Transition Zone' between Maxwells near and far field terms for emitters (and receivers, and indeed all refractive planes). [Where the 'poorly understood' non-linear optics effects appear and Snel's Law fails].
Light is scattered at c locally by each electron. Ergo, the shock 'kinetic state mixing zone' is a 'boundary' between frames that enacts the transformation c' = c, (c locally each side). It does so via the quantum mechanism of coupling (absorption) and scattering, to produce all the effects we see, including implementing the postulates of SR. i.e. Unification of physics. This simple solution may indeed be so much of a shock it can't even be recognised!
The falsification is in the way this 'Discrete Field' mechanism resolves every paradox and anomaly in the book. I'll check out the photonic references in your paper, but plasmons may be a bit peripheral to that, though the surface magneto optic and (electro optic) Kerr effects (SMOKE) are at last explained, as is ellipticity.
Let me know if you can assimilate the mechanisms kinetics and implications.
I agree OAM is poorly understood. Is there anything that's not!? Perhaps think of a wavefront quantized and a plasmon as an 'overall shape' which may contain internal oscillations at a smaller scale.
Peter