  Reflection-refraction properties of photonic barriers, formed by dielectric
gradient nanofilms, for inclined incidence of both S- and P-polarized
electromagnetic (EM) waves are examined by means of exactly solvable models. We
present generalized Fresnel formulae, describing the influence of the non-local
dispersion on reflectance and transmittance of single- and double-layer
gradient photonic barriers for S- and P- waves and arbitrary angles of
incidence. The non-local dispersion of such layers, arising due to a concave
spatial profile of dielectric susceptibility across the plane film, is shown to
result in a peculiar heterogeneity - induced optical anisotropy, providing the
propagation of S(P) waves in tunneling (travelling) regimes. The results
obtained indicate the possibility of narrow-band non-attenuated tunneling
(complete transmittance) of oblique S- waves through such heterogeneous
barriers, and the existence of spectral areas characterized by strong
reflection of P-waves and deep contrast between transmitted S- and P-waves. The
scalability of obtained exact analytical solutions of Maxwell equations into
the different spectral ranges is discussed and the application potential of
these phenomena for miniaturized polarizers and filters is demonstrated.
