Fano-Shape Grating Resonances of 3D Infinite Double-Periodic Grating of Thin Dielectric Bricks

摘要

We study the plane wave scattering from double periodic dielectric layer located in free space and illuminated by a linearly polarized plane wave. For the problem solution, we use the method of integral functional based on the vector volume integral-differential equations for the equivalent electric and magnetic polarization currents of the assumed periodic medium. Reflectance and transmittance as a function of the normalized wavelength and the grating parameters are analyzed. Extraordinary sharp grating-type resonances are revealed in the TM-and TE-polarized wave scattering near but not equal to the Rayleigh wavelengths of non-zero diffraction orders.