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Using the transfer-matrix approach and solving time-domain differentialequations, we analyze the loss compensation mechanism in multilayer systemscomposed of an absorbing transparent conductive oxide and dielectric doped withan active material. We reveal also another regime with the possibility ofenhanced transmission with suppressed reflection originating from the resonantproperties of the multilayers. For obliquely incident and evanescent waves,such enhanced transmission under suppressed reflection turns into thereflectionless regime, which is similar to that observed in the PT-symmetricstructures, but does not require PT symmetry. We infer that the reflectionlesstransmission is due to the full loss compensation at the resonant wavelengthsof the multilayers.

Transmission enhancement in loss-gain multilayers by resonant suppression of reflection