Properties of High-Tc Single Crystals as Natural Interferometers in the THz Frequency Range

摘要

We consider oblique incidence of (p)TM-polarized wave on the anisotropicsuperconducting slab, immersed on a dielectric media, such that its uniaxial(c) axis is perpendicular to the surfaces. The below and above plasma frequencytransmissivity patterns are studied and several of its properties determined,within the context of the Maxwell-London theory. Below, the regime isattenuated for any incident angle, and there is a transmissivity maximum, quitepronounced in case of a very high external dielectric constant. Above, apropagative regime exists where the superconductor is a natural opticalresonator, and we show here that the minimum of the transmission peaks aremodulated by an envelope function associated to the Brewster condition. Wepropose this set-up to obtain light with an extremely small transversewavelength inside the superconductor.