Propagation of correlation functions in cavities

Predicting the radiation of complex electromagnetic sources inside semi-open cavities and resonators is an exciting topic in optics, microwave engineering, and electromagnetic compatibility (EMC). We have recently derived an approximated formula to propagate correlation functions of fields radiated from complex and extended sources in free-space. The formula is based on a ray dynamical phase-space picture of the electromagnetic field, the so-called Wigner distribution function. Our approximation includes interference effects and evanescent wave corrections on classical ray-tracing schemes.