Patent ID: 9627850
Date: 2017-04-18
CPC Classifications: H01S

Claim:
1. A two-dimensional photonic crystal surface emitting laser comprising a laminated structure including: an active layer for generating light having a wavelength λ a two-dimensional photonic crystal layer in which refractive index distribution is formed by a plurality of modified refractive index regions two-dimensionally arranged in a plate-shaped base member, where a refractive index of the modified refractive index regions differs from that of the base member, the two-dimensional photonic crystal surface emitting laser emitting a laser beam from an in-plane position (x, y) in the two-dimensional photonic crystal layer in a direction of: an inclination angle θ(x, y) from a normal to the two-dimensional photonic crystal layer; and an azimuthal angle φ(x, y) from a reference line that extends in an x-axis direction at the in-plane position in the two-dimensional photonic crystal layer, wherein each of the modified refractive index region in the two-dimensional photonic crystal layer is modulated at respective lattice point of a basic two-dimensional lattice whose periodicity is determined such that a resonant state of the light having the wavelength λ a modulation phase Ψ(x, y) at each lattice point is expressed as by using a reciprocal lattice vector G′(x, y)↑=(g′