I am still (ref. my previous questions) trying to understand the nature of photons, so here goes: It seems most physicists imagine the photon as a wave packet, which can be mathematically constructed by superimposing (infinitely) many plane waves of slightly different frequencies to obtain its wave function. This packet (its center) travels at the speed of light in a straight line with constant momentum (inherent energy) proportional to its frequency.
Further, the photon frequency or speed (or both - its momentum) must have a spread. If not, the uncertainty principle would make it impossible to determine the position of the photon (one could not write $x=ct$).
Maxwell says an E-field (electric) can not propagate without being associated with its corresponding H-field (magnetic), the cross product representing the Poyinting vector as a measure of the fields inherent energy/momentum. Now this vector can not have any component parts besides the one in line with the path of the photon, or else a magnetic field detector should register the photon as it passes sufficiently close and thus interact with it without colliding. The same goes for an electric field detector. Hence, if the spatial path of the photon is absolutely straight, its momentum in all other directions should be exactly zero. Now this requires that the cross sectional diameter of the photon, if compared to a particle, should be zero, otherwise there would have to be radiation (from its associated 3-dimensional wave packet representation) propagating radially from the photon, so the question is:
Are there any experiments/theories that need to be explained by the photon having E and H field components that are not entirely normal to the path or that require the photon to have a "diameter" in the normal plane, and, if so, how would this not contradict the reasoning above?
One further question. Can an individual photon be circularly polarized ( yes - in wave packet theory) and thus not be blocked by any filter or does this only apply in practise to photon beams.