Control of Second-Harmonic Generation in Dielectric Polaritonic Metasurfaces Using χ(2) Polarity Switching

We demonstrate microscopic control of optical nonlinearities in an intersubband polaritonic all-dielectric metasurface comprising of Mie resonators embedded with semiconductor heterostructures. Through heterostructure design, we control the polarity of the resonant χ(2) leading to suppression or enhancement of second-harmonic generation.