The resonance patterns and lasing modes in a spiral-shaped dielectric microcavity are investigated through passive and active medium calculations. We find that the high-Q resonance modes are whispering-gallery-like modes, and these resonance modes can be easily excited as lasing modes. We also find that the quasi-scarred resonance mode, which shows strong directional emission beams from the cavity boundary, can be excited with selectively applied external pumping. Through a spectral analysis of the time evolution of the light field, the competition between these lasing modes is discussed.
© 2006 Optical Society of America
Lasers and Laser Optics
Original Manuscript: October 26, 2005
Revised Manuscript: January 5, 2006
Manuscript Accepted: February 2, 2006
Tea-Yoon Kwon, Soo-Young Lee, Michael S. Kurdoglyan, Sunghwan Rim, Chil-Min Kim, and Young-Jai Park, "Lasing modes in a spiral-shaped dielectric microcavity," Opt. Lett. 31, 1250-1252 (2006)