Electromagnetic waves propagation research in volume media increases considerably in the last years. The study evolvedfrom thick hologram gratings, Bragg and Raman-Nath diffraction regimes up to current research in photonics materials.Usually differential methods are employed to account for the light transmitted for volume media. In our proposal, wedevelop a simple and versatile integral method to calculate the diffracted field provided the media refractive index haslow variations in a wavelength scale. In fact, starting from first principles, we obtain a modified version of the Fresnelpropagator of the scalar diffraction theory. Our method is valid for some kind of magnetic, dielectric and absorbentinhomogeneous media. In particular, for TE (TM) fields, we can study media where the permittivity (permeability)gradient is perpendicular to the electric (magnetic) field and its permeability (permittivity) is constant. To validate theapproach, we applied it to (in) homogeneous media having well known diffraction properties.
展开▼
