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Journal of Optics
We study transport properties of an array created by alternating (a,b) layers with balanced loss/gain characterized by the key parameter γ. It is shown that for non-equal widths of (a,b) layers, i.e., when the corresponding Hamiltonian is non-PT-symmetric, the system exhibits the scattering properties similar to those of truly PT-symmetric models provided that without loss/gain the structure presents the matched quarter stack. The inclusion of the loss/gain terms leads to an emergence of adoi:10.1088/2040-8978/18/9/09lt01 fatcat:h2n4lkjojzhopimh5bf7btutvu