Fig. 5

A mutual directional MLP (a type of DNN) model based upon H-shaped gold meta-atoms. (a) The establishment procedures. The alphabet labels (i.e., A to D) reveal the four phases of constructions, from creation of initial population, spectral computations, model training, to performance evaluations. (b) An inversely drafted meta-atom to fit on-demand sensing usage. The targeted organic molecule dichloromethane, requiring varied spectral polarization responses (e.g., blue for vertical polarization and red for horizontal direction), is depicted in the inside graph on the left spectra. Top: the meta-atom structure with a detailed table of all relative parameters. Bottom: spectral distributions by vertical and horizontal polarized incident light. In each set of transmissions, the spectra exhibit the excellent lineshapes agreement among demanded response (solid lines), DL predictions (dots), and numerical simulations (dashed lines). Figures reproduced with permission: (a) and (b) Ref. [11], Copyright 2018 Nature Publishing Group