Lasing characteristics at different band edges in GaN photonic crystal surface emitting lasers

摘要

We have investigated the lasing characteristics of GaN-based two-dimensional photonic crystalnsurface emitting lasers u0001PCSELsu0002 with different PC lattice constants by using angled resolvednspectroscopy. Due to the Bragg diffraction theory, normalized frequency of lasing wavelength ofnPCSELs can be exactly matched with three distinct band-edge frequencies u0001u00011, K2, and M3u0002 in thenphotonic band diagram. The three band-edge frequencies u0001u00011, K2, and M3u0002 have different emissionnangles corresponding to the normal direction of the sample u00010°, 29°, and 59.5°u0002.© 2010 American