Lasing has been observed in optically pumped 4-dicyanomethylene-2-methyl-6-(p -dimethylaminostyrl)-4 H -pyran-doped poly(methyl methacrylate) square-shaped micropillars that allow four-bounce closed and open ray orbits with internal incident angle θ<sub>inc</sub>>θ<sub>c</sub> (the critical angle for total internal reflection) and with the associated surface waves that emit at the four corners. We also detect strongly TE-polarized and spatially varying emission from the square sidewalls that is due to leaky open ray orbits with θ<sub>inc</sub> near but less than θ<sub>c</sub> for two of the four bounces. By selectively pumping the square microcavity with a stripe-shaped beam, we excite different four-bounce ray orbits.
© 2004 Optical Society of America
G. D. Chern, A. W. Poon, R. K. Chang, T. Ben-Messaoud, O. Alloschery, E. Toussaere, J. Zyss, and S.-Y. Kuo, "Direct evidence of open ray orbits in a square two-dimensional resonator of dye-doped polymers," Opt. Lett. 29, 1674-1676 (2004)