Broadband resonance-enhanced frequency generation by four-wave mixing in a silicon Floquet topological photonic insulator

Floquet topological photonic insulators, whose light transport properties are dictated by the periodic drive sequence of the lattice, provide more flexibility for controlling and trapping light than undriven topological insulators. This can enable novel nonlinear optics applications in topological photonics. Here, we employ a novel resonance effect called Floquet Defect Mode Resonance (FDMR) in a 2D silicon Floquet microring lattice to demonstrate resonance-enhanced frequency generation by four-wave mixing of Floquet bulk modes in the presence of Kerr nonlinearity. The compact, cavity-less resonance mode, induced through a periodic perturbation of the lattice drive sequence, has the largest reported Q-factor for a 2D topological resonator of ~& nbsp;10(5) with low group velocity dispersion, which enables efficient broadband frequency generation over several Floquet-Brillouin zones of the Floquet topological insulator. We achieved wavelength conversion over a 10.1 nm spectral range with an average enhancement of 12.5 dB in the conversion efficiency due to the FDMR. Our work could lead to robust light sources generated directly on a topologically protected photonic platform. (C) 2022 Author(s).

Automated summary

Floquet topological photonic insulators provide more flexibility for controlling and trapping light than undriven topological insulators, and can enable novel nonlinear optics applications. In this study, resonance-enhanced frequency generation by four-wave mixing of Floquet bulk modes was demonstrated in a 2D silicon Floquet microring lattice using a resonance effect called Floquet Defect Mode Resonance (FDMR), showing potential for robust light sources on a topologically protected photonic platform.