Exceptional points (EPs)—spectral singularities of non-Hermitian linear systems—have
recently attracted interest for sensing. While initial proposals and experiments focused on …

We leverage aperiodic temporal modulations and nonreciprocity to realize PT-symmetric
phenomena without the need for gain and loss provided by external mechanisms. We …

Exceptional points (EPs) in non-Hermitian systems have recently attracted considerable
attention owing to unique state-flip** and peculiar phase accumulation features. The …

Nonreciprocity is a highly desirable feature in photonic media since it allows for control over
the traveling electromagnetic waves, in a way that goes far beyond ordinary filtering. One of …

Nonreciprocity is important for optical information processing, full-duplex communications,
and protection of sensitive laser equipment from unwanted reflections. However, it is very …

One of the most intriguing topological features of open systems is that they exhibit
exceptional point (EP) singularities. Apart from the widely explored second-order EPs …

The existence of a frozen mode in a periodic serpentine waveguide with broken longitudinal
symmetry is demonstrated numerically. The frozen mode is associated with a stationary …

We investigate local high chirality inside a microcavity near exceptional points (EPs)
achieved via asymmetric backscattering by two internal weak scatterers. At EPs, coalescent …

Exceptional points, at which two or more eigenfunctions of a Hamiltonian coalesce, occur in
non-Hermitian systems and lead to surprising physical effects. In particular, the behavior of a …

While boosting signals with amplification mechanisms is a well-established approach,
attenuation mechanisms are typically considered an anathema because they degrade the …