title: Unidirectional lasing from a microcavity with a rounded isosceles triangle shape.
abstract: We report that unidirectional lasing emission can be generated from a rounded isosceles triangular microcavity within a low nkD range, where n is the refractive index, k is the vacuum wave number, and D is the characteristic size of the microcavity. It is shown that unidirectional resonance modes have relatively high-Q values and in a nonlinear dynamic model appear as stationary lasing solutions with a low threshold. The formation of a whispering-gallery-type pattern along the rounded part on the symmetry axis is responsible for the unidirectionality of the resonances.
authors.affiliation: National Creative Research Initiative Center for Controlling Optical Chaos, Pai-Chai University, Daejeon 302-735, South Korea.
authors.forename: M S
authors.initials: MS
authors.lastname: Kurdoglyan
authors.forename: Soo-Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Sunghwan
authors.initials: S
authors.lastname: Rim
authors.forename: Chil-Min
authors.initials: CM
authors.lastname: Kim