  We focus on the transmission and reflection coefficients of light in systems
involving of topological insulators (TI). Due to the electro-magnetic coupling
in TIs, new mixing coefficients emerge leading to new components of the
electromagnetic fields of propagating waves. We have discovered a simple
heterostructure that provides a 100-fold enhancement of the mixing coefficients
for TI materials. Such effect increases with the TI's wave impedance. We also
predict a transverse deviation of the Poynting vector due to these mixed
coefficients contributing to the radiative electromagnetic field of an electric
dipole. Given an optimal configuration of the dipole-TI system, this deviation
could amount to $0.18\%$ of the Poynting vector due to emission near not
topological materials, making this effect detectable.
