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A series of thin layers of alternating refractive index is known to make agood optical mirror over certain bands of frequency. Such a device - oftentermed the Bragg reflector - is usually introduced to students within the firstyears of an undergraduate degree, often in isolation from other parts of thecourse. Here we show that the basic physics of wave propagation through astratified medium can be used to illustrate some more modern developments inoptics as well as quantum physics; from transfer matrix techniques, to theoptical properties of cold trapped atoms, optomechanical cooling, and a simpleexample of a system exhibiting an appreciable level of optical non-reciprocity.

Revisiting the Bragg reflector to illustrate some modern developments in optics