An evanescent wave is a near-field wave with an intensity that exhibits exponential decay without absorption as a function of the distance from the boundary at which the wave was formed. Evanescent waves are solutions of wave-equations, and can in principle occur in any context to which a wave-equation applies. They are formed at the boundary betw...
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http://en.wikipedia.org/wiki/Evanescent_wave
a wave on the other side of a surface from a total internal reflection; decays exponentially with distance.
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http://www.chemistry-dictionary.com/definition/evanescent+wave.php
The oscillating electric field produced at an interface where total internal reflection occurs; hence Evanescent Wave Microscopy (another name for
TIRFM).
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http://www.encyclo.co.uk/local/20832
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