- #1
wil3
- 179
- 1
For an evanescent wave, in what direction does the wavevector k point? In several lectures that I've seen in class, it appears to point in some direction that is not normal or along the interface, which confuses me.
Additionally, for all wave vectors, what exactly is the magnitude of k? In the 1D case, I'm aware that it is a simply the wave number, but does it have any special meaning in other cases?
Finally, what is the relationship between k and the Poynting vector? I'm aware that they necessarily point in the same direction, but I'm curious if there's a relationship between their magnitudes.
These concepts were very poorly explained in lecture, and so I would appreciate any advice.
Additionally, for all wave vectors, what exactly is the magnitude of k? In the 1D case, I'm aware that it is a simply the wave number, but does it have any special meaning in other cases?
Finally, what is the relationship between k and the Poynting vector? I'm aware that they necessarily point in the same direction, but I'm curious if there's a relationship between their magnitudes.
These concepts were very poorly explained in lecture, and so I would appreciate any advice.