Gravitational lensing of binary systems in wave optics
  We present the first detailed computations of wave optics effects in the
gravitational lensing of binary systems. The field is conceptually rich,
combining the caustic singularities produced in classical gravitational lensing
with quantum (wave) interference effects. New techniques have enabled us to
overcome previous barriers to computation. Recent developments in radio
astronomy present observational opportunities which, while still futuristic,
appear promising.
