In the past few years, concepts from non-Hermitian (NH) physics, originally developed within
the context of quantum field theories, have been successfully deployed over a wide range of …

Exceptional points are spectral singularities in non-Hermitian systems at which two or more
eigenvalues and their corresponding eigenvectors simultaneously coalesce. Originating …

Here we present a roadmap on Photonic metasurfaces. This document consists of a number
of perspective articles on different applications, challenge areas or technologies underlying …

The concept of non-Hermitian physics, originally developed in the context of quantum field
theory, has been investigated on distinct photonic platforms and created a plethora of …

Metasurfaces, benefiting from the flexibility in engineering the resonance, near-field,
symmetry, and scattering properties of individual building blocks, are promising not only for …

Materials and their geometry make up the tools for designing nanophotonic devices. In the
past, the real part of the refractive index of materials has remained the focus for designing …

The propagation of light in a pair of waveguides (WGs) with a complex index of refraction is
studied, when the WG parameters are adjusted in such a way as to bring the system …

Non-Hermitian optical metasurfaces have recently attracted interest as a platform for
controlling light in amplitude, phase, and polarization. Here we predict that breaking parity …

Phase gratings, each period of which consists of even numbers of equal-width and equal-
thickness elements, can be devised to attain asymmetric diffraction patterns. We show that …

Using Dammann grating (DG) metasurfaces enables miniaturization and integration of
devices for generating structured light, allowing them to be used in different applications with …