Second-harmonic generation via double topological valley-Hall kink modes in all-dielectric photonic crystals
Second-harmonic generation via double topological valley-Hall kink modes in all-dielectric photonic crystals
Nonlinear topological photonics, which explores topics common to the fields of topological phases and nonlinear optics, is expected to open up a new paradigm in topological photonics. Here, we demonstrate second-harmonic generation (SHG) via nonlinear interaction of double topological valley-Hall kink modes in all-dielectric photonic crystals (PhCs). We first show …