In this paper, we provide a comprehensive review of unidirectional reflectionless light
propagation in photonic devices at exceptional points (EPs). EPs, which are branch point …

We present an approach and a theoretical framework for generating high-order exceptional
points of degeneracy (EPDs) in photonic structures based on periodic coupled resonator …

We analyze the operation of 2× 2 switches composed of two coupled waveguides operating
on the basis of parity-time (PT) symmetry: the two waveguides differ through their gain or …

Waves entering a spatially uniform lossy medium typically undergo exponential intensity
decay, arising from either the energy loss of the Beer–Lambert–Bouguer transmission law or …

We show that obliquely incident, transversely magnetic-polarized plane waves can be totally
transmitted (with zero reflection) through epsilon-near-zero (ENZ) bilayers characterized by …

Semiconductor lasers, characterized by their high efficiency, small size, low weight, rich
wavelength options, and direct electrical drive, have found widespread application in many …

The paper reports on the coupling of Parity-Time (PT)-symmetric whispering gallery
resonators with realistic material and gain/loss models. Response of the PT system is …

We report on the impact of realistic gain and loss models on the bistable operation of
nonlinear parity–time (PT) Bragg gratings. In our model we include both dispersive and …

We demonstrate the existence of exceptional points of degeneracy (EPDs) of periodic
eigenstates in non-Hermitian coupled chains of dipolar scatterers. Guided modes supported …

The optical properties of PT-symmetric periodic stacks of the layers with balanced loss and
gain are examined. We demonstrate that the tunnelling phenomenon in periodic structures …