Piotr Migdal
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 Jan 25 awarded Notable Question Nov 9 awarded Yearling Dec 23 awarded Enlightened Dec 23 awarded Nice Answer Dec 16 awarded Popular Question Dec 12 revised Optics - Faraday Rotator using waveplates deleted 34 characters in body Dec 10 comment Light Polarizer and the Second Law of Thermodynamics See this: en.wikipedia.org/wiki/… Dec 4 revised Total internal reflection for perpendicular incidence added 46 characters in body Dec 4 comment Total internal reflection for perpendicular incidence The point is in absorption per propagation. Dec 4 comment Total internal reflection for perpendicular incidence Metals - I was thinking about them, but AFAIK they have high absorption, which also gives raise to high reflection (though, through a different mechanism). Or am I wrong? Dec 4 awarded Excavator Dec 4 revised Total internal reflection for perpendicular incidence added 113 characters in body Dec 4 comment Total internal reflection for perpendicular incidence @Ruslan Theoretic calculations based on interference of wave scattered from each atom layer. It results in both refraction and reflection from boundaries. For very strong coupling, and a certain phase of reflection, there is evanescence. Periodicity - you are right. By "uniform" I mean spatial period much, much smaller than (vacuum) wavelength. Dec 4 revised Interpretation of Dirac equation states added missing imaginary unit (oscillations, not - decay) Dec 4 comment Total internal reflection for perpendicular incidence @tom Because it misses evanescent depth (which, in my model, can be arbitrary). And for $n\to\infty$ you get 100% reflected, but no evanescent field at all. Dec 4 comment Total internal reflection for perpendicular incidence @Sushant23 Did you read the last line? I am not a high-school student, I am a PhD. Dec 4 asked Total internal reflection for perpendicular incidence Nov 9 awarded Yearling Oct 28 comment Why does the BB84 paper “Quantum cryptography: Public key distribution and coin tossing” have a 'withdrawn' status? @PeterShor I saw a few times an article being republished (I have no idea about its practical or legal side; especially I don't track which small journal/conference is owned by another). For an example, see this reprint of the original Shannon paper: dl.acm.org/citation.cfm?id=584093. Oct 28 awarded Nice Question