Signature of ray chaos in quasi-bound wave functions for a   stadium-shaped dielectric cavity
  Light emission from a dielectric cavity with a stadium shape is studied in both ray and wave models. For a passive cavity mode with low loss, a remarkable correspondence is found between the phase space representation of a quasi-bound wavefunction and its counterpart distribution in the ray model. This result provides additional and more direct evidence for good ray-wave correspondence in low-loss modes previously observed at the level of far-field emission pattern comparisons. 
Susumu Shinohara, Takahisa Harayama