title: Unidirectional emission from a cardioid-shaped microcavity laser.
abstract: We find unidirectional emission in a cardioid-shaped microcavity laser. When a deformation parameter is well adjusted, rays starting around a period-5 unstable periodic orbit emit unidirectionally. To confirm the emission direction, we fabricate a laser by using an InGaAsP semiconductor and investigate emission characteristics. When the laser is excited by current injection with a dc current, resonances localized on the period-5 unstable periodic orbit emit unidirectionally.
authors.forename: In-Goo
authors.initials: IG
authors.lastname: Lee
authors.forename: Sung-Min
authors.initials: SM
authors.lastname: Go
authors.forename: Jin-Hyeok
authors.initials: JH
authors.lastname: Ryu
authors.forename: Chang-Hwan
authors.initials: CH
authors.lastname: Yi
authors.forename: Sung-Bock
authors.initials: SB
authors.lastname: Kim
authors.forename: Kwang Ryung
authors.initials: KR
authors.lastname: Oh
authors.forename: Chil-Min
authors.initials: CM
authors.lastname: Kim