Figure 6: 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) [87].