Electromagnetic cavity able to support Tamm modes

The electromagnetic cavity as claimed in 8, wherein the active element is made of graphene.

A Tamm electromagnetic cavity possessing a resonant frequency in the THz domain, comprising:

• an interference mirror that is reflective in the THz domain, the interference mirror comprising a stack of dielectric layers comprising an alternation, in a z-direction, of two different layers, a layer of high refractive index and a layer of low refractive index, the refractive index of the layer of low refractive index being lower than that of the refractive index of the layer of high refractive index, and being manufactured by stacking layers mechanically or by joining dielectric layers to one another;
• and
• an upper metal layer deposited on or added to an upper dielectric layer of said interference mirror so as to form a structure that supports at least one Tamm mode in the THz domain, the upper metal layer being structured so as to form a grating of metal strips of width s and of period p, separated by a distance a, and of fill factor ff=s/p with p=s+a.