Abstract
We report that unidirectional lasing emission can be generated from a rounded isosceles triangular microcavity within a low range, where is the refractive index, is the vacuum wave number, and is the characteristic size of the microcavity. It is shown that unidirectional resonance modes have relatively high- 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
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