GaN blue photonic crystal membrane nanocavities

GaN-based photonic-crystal membrane nanocavities with Q factors up to 800 have been realized at the wavelength of similar to 480 nm. The tuning behavior agrees well with numerical calculations using the finite-difference time-domain method. Theoretically, the lowest energy mode of a cavity that consists of seven missing holes in the Gamma-K direction promises a Q factor as high as 4x10(4) with a mode volume of about 1.3x(lambda/n)(3).