Abstract
The Josephson vortex (JV) lattice generated by the in-plane magnetic field ${H}_{ab}$ is a periodic array that scatters Josephson plasma waves (JPWs) in layered superconductors. This produces a photonic band gap structure, i.e. terahertz (THz) photonic crystal, with easily tunable forbidden zones, or gaps, controlled either by the in-plane magnetic field or the transverse transport current ${J}_{\ensuremath{\perp}}$ flowing across the superconducting layers. A giant magneto-optical effect, that is a strong dependence of the reflection and transmission coefficients on the applied in-plane magnetic field ${H}_{ab}$, is predicted. A relatively small change of ${H}_{ab}$ can switch the sample from fully transparent to fully reflective within given frequency windows. Thus, the material can change from a THz glass to a mirror by merely changing either ${H}_{ab}$ or ${J}_{\ensuremath{\perp}}$. The described effects might be useful for development switchable ``glass/mirrors'' THz filters tuned by either ${H}_{ab}$ or ${J}_{\ensuremath{\perp}}$.
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