Gallium nitride L3 photonic crystal cavities with an average quality   factor of 16,900 in the near infrared
  Photonic crystal point-defect cavities were fabricated in a GaN free-standing photonic crystal slab. The cavities are based on the popular L3 design, which was optimized using an automated process based on a genetic algorithm, in order to maximize the quality factor. Optical characterization of several individual cavity replicas resulted in an average unloaded quality factor Q = 16,900 at the resonant wavelength {\lambda} $\sim 1.3$ {\mu}m, with a maximal measured Q value of 22,500. The statistics of both the quality factor and the resonant wavelength are well explained by first-principles simulations including fabrication disorder and background optical absorption. 
Noelia Vico Trivi\~no, Momchil Minkov, Giulia Urbinati, Matteo Galli,   Jean-Fran\c{c}ois Carlin, Rapha\"el Butt\'e, Vincenz...
physics.optics