A review is given on the foundations and applications of non-Hermitian classical and
quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra …

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 …

Optical sensors, crucial in diverse fields like gravitational wave detection, biomedical
imaging, and structural health monitoring, rely on optical phase to convey valuable …

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 …

Controlling the emission and the flow of light in micro-and nanostructures is crucial for on-
chip information processing. Here we show how to impose a strong chirality and a …

This is a review on theoretical and experimental studies on dielectric microcavities, which
play a significant role in fundamental and applied research. The basic concepts and theories …

A general theory of sensors based on the detection of splittings of resonant frequencies or
energy levels operating at so-called exceptional points is presented. Exploiting the complex …

Optical whispering‐gallery mode (WGM) microcavities featuring ultrahigh Q factors and
small mode volumes enhance significantly the interaction between light and matter …

The coherent light source is one of the most important foundations in both optical physics
studies and applied photonic devices. However, the whispering gallery microcavity, as a …

Microcavity lasers based on erbium-doped lithium niobate on insulator (LNOI), which are
key devices for LNOI integrated photonics, have attracted significant attention recently. In …