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The simplest example of visible light reflection is the glass-like surface of a smooth pool of water, where the light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Just like photonic band gaps, sonic band gaps are the result of interference: certain frequencies of wave are blocked and others are allowed through, just like one of those annoying hip clubs with velvet ropes manned by bouncers, who scan the crowd and make sure nobody "unhip" gets through the social filter. (We should note, for the sake of thoroughness, that certain semiconductor materials also produce band gaps for electrons with energies at certain frequencies.) In the case of sound, you needn't have an actual crystal (although you can).

Pages: 277

Publisher: SPIE Press (December 30, 2014)

ISBN: 1628412399

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