We have developed a simulation method which is capable of simulating the emissive properties of luminescent dyes inside uniaxial anistropic thin film microcavities[1]. The method uses plane wave decomposition of the electric field of a dipole antenna in a uniaxial medium and a scattering matrix formalism to account for interference and reflection from the various interfaces in the device. We apply this method to simulate the excitation of waveguide modes in a slab waveguide formed by reorientation of a liquid crystal. We investigate the emission both outside the device and into waveguided modes inside the liquid crystal device.