Exceptional points (EPs) arising in non-Hermitian systems have led to a variety of intriguing
wave phenomena, and have been attracting increased interest in various physical platforms …

Non-Hermitian optics is a burgeoning field at the intersection of quantum physics,
electrodynamics, and nanophotonics. It provides a new perspective of the role of gain and …

Resonant scattering, guided mode propagation phase, and/or orientation-dependent phase
retardations are the three main mechanisms used to date to conceive optical metasurfaces …

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 …

Tailoring light properties using metasurfaces made of optically thin and subwavelength
structure arrays has led to a variety of innovative optical components with intriguing …

Exceptional points (EPs), unique junctures in non-Hermitian open systems where
eigenvalues and eigenstates simultaneously coalesce, have gained notable attention in …

Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus
of much attention due to their singular eigenvalue surface structure. Nevertheless, as …

Exceptional point (EP) is a special degeneracy of non-Hermitian systems. One-dimensional
transmission systems operating at EPs are widely studied and applied to chiral conversion …

Non-Hermitian photonics and topological photonics, as new research fields in optics, have
attracted much attention in recent years, accompanying by a great deal of new physical …

Recently, it was discovered that certain non-Hermitian systems can exhibit qualitative
different properties at different system sizes, such as being gapless at small sizes and …