This Perspective examines the emerging applications of photonic topological insulators
(PTIs) in the microwave domain. The introduction of topological protection of light has …

Exciton–polaritons in optical cavities exhibit strong nonlinearities predominantly because of
the third-order Kerr-like interactions mediated by the excitonic component. Under quasi …

The application of parity–time (PT) symmetry in optics, especially PT-symmetry breaking,
has attracted considerable attention as an approach to controlling light propagation. Here …

We propose an optomechanical design, consisting of a parity-time symmetric multilayer
structure tuned at exceptional-point degeneracy (EPD), with an adjustable layer that is …

We investigate, using a microwave platform consisting of a non-Hermitian Su-Schrieffer-
Heeger array of coupled dielectric resonators, the interplay of a lossy nonlinearity and CT …

Periodic structures with a Bloch dispersion relation supporting a stationary inflection point
(SIP) can display a unique scattering feature, the frozen mode regime (FMR). The FMR is …

Synthetic photonic materials created by engineering the profile of refractive index or
gain/loss distribution, such as negative-index metamaterials or parity-time-symmetric …

Receiver protectors (RPs) shield sensitive electronics from high-power incoming signals that
might damage them. Typical RP schemes range from simple fusing and PIN diodes to …

We propose a conceptual design of optical power limiters with abrupt limiting action and
enhanced power-handling capabilities that is based on exceptional point degeneracies …

We present the theory of parametrically resonant surface plasmon polaritons (SPPs). We
show that a temporal modulation of the dielectric properties of the medium adjacent to a …