TWO-DIMENSIONAL PHOTONIC CRYSTAL SURFACE-EMITTING LASER

摘要

A two-dimensional photonic crystal surface-emitting laser is provided which is well-suited to manufacture and which has modified refractive index region pairs which can obtain high optical output. This two-dimensional photonic crystal surface-emitting laser 10 comprises: two-dimensional photonic crystals that are arranged on lattice points of a square lattice of periodic length a and that include, on a plate-shape base material 121, a modified refractive index region pair 122 comprising a main modified refractive index region 1221 having a refractive index different from that of the base material and an auxiliary modified refractive index region 1222, the planar shape of which has a surface area smaller than that of the main modified refractive index region; and an active layer 11 provided on one side of the base material 121, wherein the distance between the center of gravity G1 of the main modified refractive index region 1221 and the center of gravity G2 of the auxiliary modified refractive index region 1222 is 0.25-0.28a; the auxiliary modified refractive index region 1222 has a shape which would have an 80% or greater overlap region with the main modified refractive index region 1221 if said auxiliary modified refractive index region 1222 were translated so as to superimpose the center of gravity G2 over the center of gravity G1 of the main modified refractive index region 1221; and the planar shape of the main modified refractive index region 1221 is a triangle in which the greatest angle is greater than 60°.