  A parametric study of Drude and Lorentz models performances in maximizing
near-field radiative heat transfer between two semi-infinite planes separated
by nanometric distances at room temperature is presented in this paper. Optimal
parameters of these models that provide optical properties maximizing the
radiative heat flux are reported and compared to real materials usually
considered in similar studies, silicon carbide and heavily doped silicon in
this case. Results are obtained by exact and approximate (in the extreme
near-field regime and the electrostatic limit hypothesis) calculations. The two
methods are compared in terms of accuracy and CPU resources consumption. Their
differences are explained according to a mesoscopic description of near-field
radiative heat transfer. Finally, the frequently assumed hypothesis which
states a maximal radiative heat transfer when the two semi-infinite planes are
of identical materials is numerically confirmed. Its subsequent practical
constraints are then discussed.
