Diffraction properties of Fibonacci metallic gratings

DIANA C. SKIGIN, RICARDO A. DEPINE, JUAN A. MONSORIU, AND WALTER D. FURLAN

Lima, Peru

Congreso; RIAO-OPTILAS 2010: VII Ibero American Meeting on Optics and X Latino American Meeting on Optics, Lasers and Applications; 2010

The electromagnetic diffraction from metallic surfaces having rectangular profiles has been studied by many authors. Most of the investigations have been devoted to ideal gratings, i.e., those strictly periodic. The Fourier spectrum of these infinite periodic structures shows a discrete distribution of equidistant well-defined diffractions peaks. However, disordered structures exhibit a continuous Fourier spectrum. At the intermediate regime between ordered and totally disordered structures, aperiodic diffraction gratings, i.e., gratings constructed using a deterministic sequence, have characteristic spectral patterns as we have shown recently for Fractal (Cantor) metallic gratings. In this work we analyze the reflection properties of metallic gratings constructed using the Fibonacci sequence. We use a rigorous electromagnetic modal method which permits to evaluate structures with arbitrary widths and depths.