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The emission directionality of the well-studied Robnik billiard again conforms well to the classical prediction we made in Opt. Lett. 19, 1693 (1994).

Robnik billiard wavefunction Shown here is the Robnik billiard at fractional deformation 0.045 and refractive index n=2. The wavenumber on the outside is kR=43.1 (R is the undeformed radius), corresponding to kR=86.2 on the inside. The resonant state depicted corresponds to sin chi=0.7 which lies in the chaotic region of phase space. One sees tangential escape from the high-curvature regions.
Robnik billiard SOS The Poincare section of the Robnik billiard at this deformation shows the extent of chaos and island structure.

Jens Uwe Nöckel, 06/97