Recent progress on nonlinear properties of parity-time (PT)-symmetric systems is
comprehensively reviewed in this article. PT symmetry started out in non-Hermitian quantum …

The so-called PT symmetric devices, which feature ε (− x)= ε (x)* associated with parity-time
symmetry, incorporate both gain and loss and can present a singular eigenvalue behaviour …

We show the controllable excitation transmission can be implemented based on the
topologically protected edge channel in the modulated Su-Schrieffer-Heeger model with …

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 …

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 …

Inspired by the parity-time symmetry concept, we show that a judicious spatial modulation of
gain and loss in ε-near-zero metamaterials can induce the propagation of exponentially …

Abstract PT symmetric Aubry–Andre model describes an array of N coupled optical
waveguides with position-dependent gain and loss. We show that the reality of the spectrum …

Dissipation is a ubiquitous phenomenon in dynamical systems encountered in nature
because no finite system is fully isolated from its environment. In optical systems, a key …

In the context of non-Hermitian photonics, we study the physics of transient growth in
coupled waveguide systems that exhibit higher-order exceptional points. We demonstrate …

Multimode waveguides can be used as multichannel devices to push the transmission
bandwidth of optical signals to its limits, provided demultiplexing can be correctly performed …