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

Abstract

Using the transfer-matrix approach and solving time-domain differential equations, we analyze the loss compensation mechanism in multilayer systems composed of an absorbing transparent conductive oxide and dielectric doped with an active material. We reveal also another regime with the possibility of enhanced transmission with suppressed reflection originating from the resonant properties of the multilayers. For obliquely incident and evanescent waves, such enhanced transmission under suppressed reflection turns into the reflectionless regime, which is similar to that observed in the PT-symmetric structures, but does not require PT symmetry. We infer that the reflectionless transmission is due to the full loss compensation at the resonant wavelengths of the multilayers.

arXiv comment12 pages, 10 figures

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Cited by in corpus (8)

• Unambiguous scattering matrix for non-Hermitian systems
• PT-symmetry breaking in multilayers with resonant loss and gain locks light propagation direction
• CPA-laser effect and exceptional points in PT-symmetric multilayer structures
• Multimode parity-time and loss-compensation symmetries in coupled waveguides with loss and gain
• Loss compensation symmetry of unequally sized dielectric cylinders with gain and loss
• Virtual perfect absorption in resonant media and their PT-symmetric generalizations
• Controlling wave-front shape and propagation time with tunable disordered non-Hermitian multilayers
• Different regimes of ultrashort pulse propagation in disordered layered media with resonant loss and gain