photonic crystal surface-emitting laser, which is enabled by the accidental Dirac point

摘要

photonic crystal surface-emitting laser (PCSEL), the linear dispersion in the center of the Brillouin zone of the photonic crystal It includes a gain medium that is electromagnetically coupled to the photonic crystal having the energy band structure showing the Dirac cone. Although the apex of the Dirac cone called Dirac point, which is that it is because the center of the Brillouin zone, it is referred to as incidental Dirac point. The band structure of the photonic crystal (for example, by changing the dimensions or the refractive index of the photonic crystal) to tune to indicate accidental Dirac point, many orders of magnitude the mode spacing of a photonic crystal is also increased, and reduce the distribution surface in the feedback of the photonic crystal, or annihilate. Therefore, the photonic crystal, it is possible to operate as a resonator that supports a single mode output from PCSEL over larger area than is possible with conventional PCSEL with secondary band edges distributed.BACKGROUND 4A