Two-dimensional photonic crystal surface-emitting laser
First Claim
1. A two-dimensional photonic crystal surface-emitting laser having a two-dimensional photonic crystal placed near an active layer that emits light when carriers are injected thereinto, the two-dimensional photonic crystal having media having different refractive indices arrayed with a two-dimensional period, wherein the two-dimensional photonic crystal is formed as a square lattice having patches of one medium arrayed periodically at equal intervals in two mutually perpendicular directions, and at least part of fundamental lattices, of which each has a shape of a square that has vertices thereof at patches of the one medium and of which a length of each side equals a minimum period of equally sized patches of the one medium, has an asymmetric refractive index distribution with respect to one of two diagonal lines of those fundamental lattices.
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Abstract
Two-dimensional photonic crystal surface-emitting laser comprising a two-dimensional photonic crystal, having media different in refractive index arrayed in a two-dimensional cycle, disposed in the vicinity of an active layer that emits light by the injection of carriers, wherein the two-dimensional photonic crystal consists of square lattices having equal lattice constants in perpendicular directions, and a basic lattice consisting of a square with one medium as a vertex has an asymmetric refractive index distribution with respect to either one of the two diagonals of the basic lattice to thereby emit light in a constant polarizing direction.
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Citations
11 Claims
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1. A two-dimensional photonic crystal surface-emitting laser having a two-dimensional photonic crystal placed near an active layer that emits light when carriers are injected thereinto, the two-dimensional photonic crystal having media having different refractive indices arrayed with a two-dimensional period,
wherein the two-dimensional photonic crystal is formed as a square lattice having patches of one medium arrayed periodically at equal intervals in two mutually perpendicular directions, and at least part of fundamental lattices, of which each has a shape of a square that has vertices thereof at patches of the one medium and of which a length of each side equals a minimum period of equally sized patches of the one medium, has an asymmetric refractive index distribution with respect to one of two diagonal lines of those fundamental lattices.
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2. A two-dimensional photonic crystal surface-emitting laser having a two-dimensional photonic crystal placed near an active layer that emits light when carriers are injected thereinto, the two-dimensional photonic crystal having media having different refractive indices arrayed with a two-dimensional period,
wherein mode degeneration at a Γ - point of the two-dimensional photonic crystal is resolved.
Specification