TWO-DIMENSIONAL PHOTONIC CRYSTAL LASER

摘要

The present invention aims at providing a two-dimensional photonic crystal laser capable of generating symmetrical spots of laser light. The two-dimensional photonic crystal laser includes a two-dimensional photonic crystal 15 made of a plate-shaped member 151 provided with a periodic arrangement of many identically-shaped modified refractive index areas (or holes) 152A through 152D having a refractive index different from that of the plate-shaped member 151; and an active layer provided on one side of the two-dimensional photonic crystal, wherein: the modified refractive index areas are arranged at lattice points of a lattice with a same period at least in two directions; a shape of each the modified refractive index area is such that a feedback strength is different with respect to directions of two primitive lattice vectors of the lattice; the two-dimensional photonic crystal has a periodic structure of a supercell 154, as a unit, which contains a plurality of lattice points; and the sum of the feedback strengths by all modified refractive index areas 152A through 152D in the supercell 154 is identical in each direction of the two primitive lattice vectors.