Exceptional nanophotonics, creating quantum symmetry on-a-chip and utilizing its associated topology, enables novel photonics functionalities. In particular, I will discuss an orbital angular momentum microlaser and non-Hermitian topological photonics for robust yet flexible photonic integrated circuits and laser sources for optical communication and computing.
In this work we show our results on the harmonic generation and nonlinear frequency mixing enhanced by Mie modes in GaAs metasurfaces. Moreover, we show enhancement and directionality control of the quantum dot emission embedded in the metasurface.