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So - parking all things Quantum for a moment and focussing just on the classical.

I set my experiment for TIR up so that my beam of light is reflected from the boundary with the maximum possible brightness - i.e whatever losses in transmission I get, whatever the losses due to the evanescent wave are, I adjust the angle so that the reflected beam is at it's maximum possible brightness.

Question: When I put a lens close to (behind) the TIR point and get a beam "out of the back" of the experiment, am I simply focussing the evanescent wave into something that I can now see, or does the TIR reflected beam dim? In other words am I actually increasing the amount of light that comes through the boundary, or just manipulating the evanescent wave?

Now switching to the Quantum Realm

When FTIR is being used to describe quantum tunnelling, is this just stating that the probability wave describing where my particle/photon will be found has non-zero values the other side of the boundary, so with enough particles/photons bouncing off a boundary, some number of them (presumably based on the size of the evanescent wave) will appear on the other side of the boundary?

Thanks

Matt

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*Please remember this is a "B" question - even if the answer isn't, my brain is! Thanks in advance :-)*