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 …

Recent years have witnessed a flurry of research activities in topological photonics,
predominantly driven by the prospect for topological protection–a property that endows such …

Non-Hermitian degeneracies, also known as exceptional points, have recently emerged as
a new way to engineer the response of open physical systems, that is, those that interact …

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 …

Mode control in a laser cavity is critical for a stable single-mode operation of a ring laser. In
this study we propose and experimentally demonstrate an electrically pumped parity-time …

A system of two coupled semiconductor-based resonators is studied when lasing around an
exceptional point. We show that the presence of nonlinear saturation effects can have …

We show that the synthetic gauge fields for photons provide a versatile approach to
generate and control the non-Hermitian skin effect. By utilizing indirectly coupled optical ring …

Nanolasers are key elements in the implementation of optical integrated circuits owing to
their low lasing thresholds, high energy efficiencies, and high modulation speeds. With the …

We report parity-time (PT) symmetry breaking in electrically injected, coherently coupled,
vertical cavity surface emitting laser arrays. We predict beam steering, mode evolution, and …

Conventional techniques for transverse mode discrimination rely on introducing differential
external losses to the different competing mode sets, enforcing single‐mode operation at the …