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 …

Non-Hermitian wave engineering has attracted a surge of interest in photonics in recent
years. Prominent non-Hermitian phenomena include coherent perfect absorption and its …

A drawback of optical modes in microdisk cavities is their isotropic light emission. Here we
report a novel, robust, and general mechanism that results in highly directional light …

We introduce a new scheme to design optical microcavities supporting high-Q modes with
unidirectional light emission. This is achieved by coupling a low-Q mode with unidirectional …

We demonstrate directional output from a deformed disk laser of dimensions comparable to
the emission wavelength. Unlike larger deformed cavity lasers, which exhibit universal …

We demonstrate a robust and generic mechanism, which we term “chaos-assisted
channeling,” to achieve unidirectional output from wave-chaotic microcavities with long-lived …

Whispering gallery mode based optical microcavities are important for highly sensitive
optical sensing. However, the current experimental realizations are strongly dependent on …

The ray dynamics of optical cavities exhibits bifurcation points: special geometries at which
ray trajectories switch abruptly between stable and unstable. A prominent example is the …

In dielectric cavities with a rotational symmetry, whispering gallery modes (WGMs) with an
extremely long lifetime (that is, a very high Q factor) can be formed by total internal reflection …

Asymmetric resonant cavities (ARCs) with smoothly deformed boundaries are currently
under intensive study because they possess distinct properties that conventional symmetric …