Are there any materials, which give total internal reflection for perpendicular incidence?
Here, by this phenomena I mean:
- no absorption (including for evanescent propagation inside),
- finite evanescence depth (even if very small).
I am asking, as some of my calculations gave this result. Yet, I am not sure whether this result is physical (i.e. can happen) or practical (i.e. there is a system exhibiting such phenomenon).
I does works that way for dielectric mirrors. I am curious if there are any "uniform" materials exhibiting such effect. By "uniform" I mean spatial period (or any kind of other structure) much, much smaller than (vacuum) wavelength.
(Obviously, it goes beyond refraction index, so please don't write it is not possible with a fixed $n$, because I know.)