Figure 1: NOM metasurface geometry and simulated optical response for varying interparticle spacing.
From: Colloidal metasurfaces displaying near-ideal and tunable light absorbance in the infrared
(a) Schematic of the model NOM structure with Ag nanocubes assembled atop an Au film with a dielectric spacer. Adjustable parameters include interparticle distance (d), length of nanocube edge (e), thickness of Au film (τ) and dielectric spacer height (h). (b) Reflectance spectra of simulated NOM arrays of 92 nm Ag nanocubes with d=4–300 nm. (c) Plot showing exponential trend of fundamental resonance wavelength as a function of interparticle spacing. (d) Plot of the FWHM of the fundamental resonance for decreasing d. (e) Magnetic and electric field intensities calculated at the fundamental resonance wavelength (λ=2.54 μm) for a close-packed NOM metasurface with d=4 nm. The high-field regions (red) for the H-field are supported below the nanocube, whereas they are apparent in the inter-nanocube gap for the E-field.
