Evanescent field

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Notion

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Science and technology

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What Wikipedia says

In electromagnetics, an evanescent field, or evanescent wave, is an oscillating electric and/or magnetic field that does not propagate as an electromagnetic wave but whose energy is spatially concentrated in the vicinity of the source (oscillating charges and currents).

Excerpt from the Wikipedia article “Evanescent field”, under the CC BY-SA 4.0 license. Read the article on Wikipedia