The scattering of electromagnetic waves lies at the heart of most experimental techniques
over nearly the entire electromagnetic spectrum, ranging from radio waves to optics and x …

Recent years have seen a tremendous progress in the theory and experimental
implementations of non-Hermitian photonics, including all-lossy optical systems as well as …

Exceptional points (EPs) are responsible for a number of interesting phenomena in non-
Hermitian wave systems. Here we show, both theoretically and experimentally, that EPs can …

In the past decade, the concept of parity-time $(\mathcal {PT}) $ symmetry, originally
introduced in non-Hermitian extensions of quantum mechanical theories, has come into …

We analyze the optical properties of one-dimensional PT-symmetric structures of arbitrary
complexity. These structures violate normal unitarity (photon flux conservation) but are …

Exploiting the interplay between gain, loss and the coupling strength between different
optical components creates a variety of new opportunities in photonics to generate, control …

BACKGROUND Singularities are critical points for which the behavior of a mathematical
model governing a physical system is of a fundamentally different nature compared to the …

Temporal interfaces introduced by abrupt switching of the constitutive parameters of
unbounded media enable unusual wave phenomena. So far, their explorations have been …

For a general complex scattering potential defined on a real line, we show that the equations
governing invisibility of the potential are invariant under the combined action of parity and …

The exploration of quantum‐inspired symmetries in optical and photonic systems has
witnessed immense research interest both fundamentally and technologically in a wide …