The plasmons of surface belong to the solutions of the equations of propagation electromagnetic waves or Maxwell's equations, they are solutions particular to the interface between certain mediums. The collective oscillation of the electrons which corresponds to them coexists with the electromagnetic field évanescent on the two sides of the interface.
In particular, an interface between a metal, such money, and the vacuum or the air, rather easily reveals the appearance of the plasmons. The Vecteur of wave has two real components then, corresponding to the propagation of the plasmon along the interface, and an imaginary component, characterizing the decrease of the wave on the two sides of the interface.
An example of such waves can be obtained by a simple assembly, requiring nevertheless some average techniques.
On a face of a prism out of glass, one deposits (by evaporation) a money film of a few tens of nanometers thickness. One then brings a ray of polarization TM (transverse magnetic) in incidence higher than the incidence limit of refraction of the diopter glass-air. For a well determined angle, characteristic of metal, the wave which was completely considered is absorbed by the excitation of the plasmons of surface: the considered wave disappears.
The phenomenon is then easily observable.
This capture of the incidental wave is allowed by complex nature of the dielectric Constante of the metal, which establishes the link between the incidental wave TM and the wave plasmon of surface.
These waves find various applications in physics and biophysics, the such Résonance plasmon of surface .
External bond
Application: Thesis of Gaëtan LÉVÊQUE: HANDLING Of COLD ATOMS BY CONFINED OPTICAL FIELDS: THEORY AND DIGITAL SIMULATION
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