Figure 3: Crossed metallic gratings and broadband, polarization-independent plasmonic super absorbers.

(a) SEM images of two different crossed metallic gratings with w=60 and 120 nm. Scale bars are 500 nm (b) Measured and (c) Simulated extinction spectra for two different crossed metallic gratings. (d) Extinction spectra for 120-nm-wide crossed-grating structure as a function polarization angle and wavelength. (e) SEM image of the fabricated crossed trapezoid arrays (left) and a single unit cell of crossed trapezoid (right). Scale bars are 500 and 100 nm, respectively. (f) Measured, and (g) Simulated extinction spectra using digitized SEM images (inset) for different incident electric field polarization angles (inset). (h) Extinction spectra for crossed trapezoid array as a function polarization angle and wavelength.