Fig. 3: Reflections by PT-symmetric magneto-electric media.
We assume PT symmetry to exclude natural optical activity, for simplicity. a Single interface. The light propagation within each medium is determined by the refractive index n and origin-independent magneto-electric coupling Tij and electric quadrupole susceptibility Sijk tensors. We consider the case where no birefringence occurs such that the light propagation is described by a unique refractive index in each medium. b Double interfaces. Infinite reflections occur between the top and bottom surfaces of medium 2. Light obtains the complex phase ϕ = kd = n2ωd/c while propagating the distance d in medium 2.
