Is there any pratical way to generate (or utilize) a longitudinal, or Poynting vector, wave?
For example, by establishing a coil geometry, within a non-linear medium, in which the E and B vectors oppose and partially cancel.
If so, what might be the characteristics of such a wave?
Apart from the fringe science crowd, I have seen mainstream references which apparently capitalize technologically on the longitudinal vector, and others claiming it doesn't exist as an independent force.
Any informed opinions?
And a related question, if E and H vectors occur at 90 degrees in a transmitting dipole, can anyone explain how the emitted transverse EM wave becomes in-phase in free space?
Richard Former