Harmonic Generation in Mie-Resonant GaAs Nanowires

High-refractive-index nanoparticles that support Mie resonances are emerging as alternatives to plasmonic nanostructures [1] as nonlinear nanophotonic devices with low losses and increased functionalities [2]. Second- and third-harmonic generation (SHG, THG) have been so far investigated in isolated and arrayed Si and GaAs resonant nanoparticles with three-dimensional (3D) light confinement, such as spheres and finite cylinders.