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From Nordan Symposia
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==Origin==
[[Latin]] evanescent-, evanescens, present participle of evanescere
*[http://en.wikipedia.org/wiki/18th_century 1717]
==Definition==
*1: tending to vanish like vapor
==Description==
An '''evanescent''' [[wave]] is a nearfield standing wave with an [[intensity]] that exhibits [[exponential]] decay with distance from the boundary at which the wave was formed. Evanescent waves are a general property of wave-[[equations]], and can in principle occur in any [[context]] to which a wave-equation applies. They are formed at the boundary between two [[media]] with different wave [[motion]] properties, and are most [[intense]] within one-third of a wavelength from the [[surface]] of formation. In particular, evanescent waves can occur in the [[contexts]] of: [[optics]] and other forms of [[electromagnetic]] [[radiation]], [[acoustics]], [[quantum mechanics]], and "waves on strings".
[[Category: General Reference]]
==Origin==
[[Latin]] evanescent-, evanescens, present participle of evanescere
*[http://en.wikipedia.org/wiki/18th_century 1717]
==Definition==
*1: tending to vanish like vapor
==Description==
An '''evanescent''' [[wave]] is a nearfield standing wave with an [[intensity]] that exhibits [[exponential]] decay with distance from the boundary at which the wave was formed. Evanescent waves are a general property of wave-[[equations]], and can in principle occur in any [[context]] to which a wave-equation applies. They are formed at the boundary between two [[media]] with different wave [[motion]] properties, and are most [[intense]] within one-third of a wavelength from the [[surface]] of formation. In particular, evanescent waves can occur in the [[contexts]] of: [[optics]] and other forms of [[electromagnetic]] [[radiation]], [[acoustics]], [[quantum mechanics]], and "waves on strings".
[[Category: General Reference]]
