P13 – Genetic algorithm optimization of infrared plasmonic absorbers

The absorption of a multiband absorber based on a periodical plasmonic grating has been optimized. The optical and geometrical parameters of the plasmonic structure which is composed of germanium and gold are determined by an efficient genetic algorithm. The electromagnetic response of the absorber is numerically obtained by using the frequency domain finite element method. A multiband absorber with near unity
absorption in the mid- and long-wave infrared region from 3.5 μm to 7 μm has been obtained.