In an optical device, a slab layer includes an active layer sandwiched between cladding layers. The slab layer has a periodic refractive index profile structure in a two-dimensional plane, as a two-dimensional slab photonic crystal structure, and a linear defect region serving as a waveguide in the periodic...http://www.google.fr/patents/US7436873?utm_source=gb-gplus-shareBrevet US7436873 - Optical device and semiconductor laser oscillator
