Research Article

Photonic Wannier-Stark Ladder from Coupled Electromagnetic Cavities

Figure 1

(a) The Kronig-Penney potential (coupled quantum wells) titled by a static electric field, where is the spatial periodicity between the neighboring wells and the red line depicts schematically the quantum WSL state localized in the different well. (b) The one-dimensional coupled EM cavities, that is, “photonic wells,” with increasing the refractive indexes of the dielectric layers, , , , and , along the -direction.