  We present a numerical method for the accurate and efficient simulation of
strongly localized light sources, such as quantum dots, embedded in dielectric
micro-optical structures. We apply the method in order to optimize the photon
extraction efficiency of a single-photon emitter consisting of a quantum dot
embedded into a multi-layer stack with further lateral structures. Furthermore,
we present methods to study the robustness of the extraction efficiency with
respect to fabrication errors and defects.
