Wave chaos in a new class of optical microcavity

We introduce a new class of open optical microcavity whose confinement and directional emission properties can be engineered through modification of a space-dependent refractive index. Numerical results are provided for a microdisc with Gaussian deformation of the refractive index. This leads to a new way of breaking integrability and inducing chaos in the classically equivalent system ({\em photonic billiard}, see companion contribution in Category 7.3) and to the potential fabrication of reconfigurable microlasers.