Figure 2
1D grating plasmonic-MIM pixel: (a) Schematic of 1D MIM grating with common grating parameters defined: grating widths, w g (nm), grating period, Λ (nm), duty cycle, Γ = w g /Λ. (b) Shows the simulated reflection response of a typical 1D plasmonic MIM pixel with two resonant absorption modes, with the associated field profiles shown in (c). A more detailed set of simulations is found in the Supplementary Material. (d) Optical characterization results of a range of pixels exhibiting vivid colors under varying polarization conditions and (e) the SEM images of the min and max gratings for several rows. In (d), the three insets are zoomed in versions of selected RGB colors in the larger array. (f) Experimental reflection measurements, λ vs. Λ (which varies in the x-axis in (d)), of different pixel rows (1–20), showing multiple distinct resonant mode (absorption) profiles, which increase in wavelength with increasing grating period. Between the two modes there is the region of high reflection, due to Al back reflector, which is spectrally dependent on grating width and grating period.
