Room temperature continuous wave operation of a surface-emitting two-dimensional photonic crystal diode laser.

We achieved room temperature continuous wave operation of a surface-emitting two-dimensional photonic crystal diode laser by current injection. This is the first time ever that room temperature continuous wave operation of a photonic crystal diode laser has been realized. This laser features single mode oscillation over a large area, which is impossible for conventional lasers. In this work, we optimized the epitaxial layer composition for better carrier confinement and clarified the relationship between the diameter of the air holes in the photonic crystal and the threshold current of the laser in order to estimate the optimized threshold current.