  The transformation from evanescent waves to propagation waves is the key
mechanism for the realization of some super-resolution imaging methods. By
using the recursive Green function and scattering-matrix theory, we
investigated in details on the transport of evanescent waves through a random
medium and analyzed quantitatively the coupling of evanescent channels to
propagation channels. By numerical calculations, we found that the transmission
for the incident evanescent channel is determined by both the eigenvalues of
the scattering matrix and the coupling strength to the corresponding
propagation channels in random medium, and the disorder strength of the random
medium influences both of them.
