  Recents works deal with the optical transmission on arrays of subwavelength
holes in a metallic layer deposited on a dielectric substrate. Making the
system as realistic as possible, we perform simulations to enlighten the
experimental data. This paper proposes an investigation of the optical
properties related to the transmission of such devices. Numerical simulations
give theoretical results in good agreement with experiment and we observe that
the transmission and reflection behaviour correspond to Fano's profile
correlated with resonant response of the eigen modes coupled with
nonhomogeneous diffraction orders. We thus conclude that the transmission
properties observed could conceivably be explained as resulting from resonant
Wood's anomalies.
