We report that unidirectional lasing emission can be generated from a rounded isosceles triangular microcavity within a low <i>nkD</i> range, where <i>n</i> is the refractive index, <i>k</i> is the vacuum wave number, and <i>D</i> 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.
© 2004 Optical Society of America
M. S. Kurdoglyan, Soo-Young Lee, Sunghwan Rim, and Chil-Min Kim, "Unidirectional lasing from a microcavity with a rounded isosceles triangle shape," Opt. Lett. 29, 2758-2760 (2004)