Unidirectional reflectionlessness of a PT-symmetric 1D PhC with cross-matching ε(z) to μ*(−z).
(A) Permittivity (ε) and permeability (μ) profiles of a 1D PhC stacking alternating purely dielectric slabs with ε=2.25+iγ and purely magnetic slabs with μ=2.25−iγ with equal filling ratio and varying γ. (B) Forward and (C) backward reflectance (in natural log scale) for the PhC in (A) with a finite thickness of four unit cells. (D) Splitting of eigenvalues of the effective constitutive matrix C−1. The scattered symbols (solid lines) are the numerical results (analytical effective medium results) .