US 12,155,176 B2
Two-dimensional photonic-crystal surface-emitting laser
Susumu Noda, Kyoto (JP); Takuya Inoue, Osaka (JP); Masahiro Yoshida, Kyoto (JP); and Menaka De Zoysa, Muko (JP)
Assigned to KYOTO UNIVERSITY, Kyoto (JP)
Appl. No. 17/430,852
Filed by KYOTO UNIVERSITY, Kyoto (JP)
PCT Filed Feb. 4, 2020, PCT No. PCT/JP2020/004174
§ 371(c)(1), (2) Date Aug. 13, 2021,
PCT Pub. No. WO2020/170805, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-030277 (JP), filed on Feb. 22, 2019.
Prior Publication US 2022/0131343 A1, Apr. 28, 2022
Int. Cl. H01S 5/11 (2021.01)
CPC H01S 5/11 (2021.01) 7 Claims
OG exemplary drawing
 
1. A two-dimensional photonic-crystal surface-emitting laser comprising:
a) an active layer configured to emit light by supplying an electric current; and
b) a photonic-crystal layer including
b-1) a two-dimensional photonic-crystal light-amplification portion that is a first two-dimensional photonic-crystal region provided, for introducing the light emitted from the active layer, in a plate-shaped base body disposed on one side of the active layer, and includes an amplification-portion photonic band gap which is a photonic band gap formed between two photonic bands having a band edge at a predetermined point in a reciprocal lattice space, and
b-2) a two-dimensional photonic-crystal light-reflection portion that is a second two-dimensional photonic-crystal region provided around the two-dimensional photonic-crystal light-amplification portion, and includes a reflection-portion photonic band gap which is a photonic band gap formed between two photonic bands having a band edge at the predetermined point of the reciprocal lattice space,
wherein energy ranges of the amplification-portion photonic band gap and the reflection-portion photonic band gap partially overlap and are different, and
wherein, when the electric current is supplied into the two-dimensional photonic-crystal light-amplification portion, an energy of a lower band edge of the amplification-portion photonic band gap does not exceed an energy of a lower band edge of the reflection-portion photonic band gap.