Study on luminescence properties of GaN photonic crystal resonators based on nanopore confinement

We designed and implemented a photonic crystal resonant cavity enhanced blue light emitting device confined by nanoporous GaN. Adopting a design scheme combining surface-etched two-dimensional photonic crystals with a low refractive index nanoporous GaN confinement layer, and utilizing rigorous coupled wave analysis (RCWA) and finite difference time domain (FDTD) simulation methods, we optimized the layer structure and photonic crystal parameters. The optimized resonant cavity possesses the confinement factor of a photonic crystal and a quantum well exceeding 3% and 4%, respectively, and a simulated quality factor exceeding 7000. The measurement demonstrates that through deep modulation of waveguide modes by photonic crystals, we achieved efficient mode selection surface emission at a wavelength of ∼410 nm with a full width at half maximum of approximately 2 nm.