An evanescent wave is a near-field 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".
Read more about Evanescent Wave: Evanescent Wave Applications, Total Internal Reflection of Light, Evanescent-wave Coupling
Famous quotes containing the words evanescent and/or wave:
“The thing about Proust is his combination of the utmost sensibility with the utmost tenacity. He searches out these butterfly shades to the last grain. He is as tough as catgut and as evanescent as a butterfly’s bloom.”
—Virginia Woolf (1882–1941)
““Speaking of contraries, see how the brook
In that white wave runs counter to itself.
It is from that in water we were from
Long, long before we were from any creature.”
—Robert Frost (1874–1963)