Valley-Hall nanoscale lasers

Topological photonics allows the creation of new states of light. Miniaturization of topological states to the nanoscale offers new opportunities for controlling light in integrated nanophotonic circuits. Recently, a team of researchers demonstrated a nanoscale laser based on a topological cavity. Researchers employed InGaAsP quantum well membrane as a gain medium and nanopatterned it making a cavity that hosts a topological mode of light. They observed a single-mode lasing at a room temperature.