Patent ID: 10879669

Abstract:
A photonic crystal laser 10 is a laser that has a configuration, in which a light emitting layer (an active layer 12) that generates light including light of wavelength λL, and a two-dimensional photonic crystal layer 11 including different refractive index regions (holes 111) disposed two-dimensionally on a plate-like base material 112, the different refractive index regions having a refractive index different from a refractive index of the base material, so that a refractive index distribution is formed, are stacked. Each different refractive index region in the two-dimensional photonic crystal layer 11 is disposed at a position shifted from each lattice point of a basic two-dimensional lattice that has periodicity defined to generate a resonant state of light of the wavelength λL by forming a two-dimensional standing wave and not to emit light of the wavelength λL to outside. A positional shift vector Δr↑ representing the shift of the position of the different refractive index region at the each lattice point from the lattice point is expressed by Δr↑=d·sin(±G′↑·r↑+ψ0)·(cos(L(φ+φ0)), sin(L(φ+φ0)))by using a wave number vector k↑=(kx, ky) of light of the wavelength λL in the two-dimensional photonic crystal layer 11, an effective refractive index neff of the two-dimensional photonic crystal layer, an azimuth angle φ from a predetermined reference line extending in a predetermined direction from a predetermined origin of the basic two-dimensional lattice, an arbitrary constant φ0, and a reciprocal lattice vector G′↑=±(kx±|k↑|(sin θ cos φ)/neff, ky±|k↑|(sin θ sin φ)/neff) expressed by using a spread angle θ of a laser beam, the position vector r↑ of the each lattice point, arbitrary constants d and ψ0, and an integer L excluding 0.