Figure 5
Gaussian plasmonic MIM pixels: (a,b) SEM and optical images (microscope) of 2D Gaussian nanostructured pixels, with the overlaid Gaussian functions in x/y. The optical images are with two orthogonal analyzer conditions and a crossed-polarization state, showing gradient color functions associated with each pixel. Λ x and Λ y is the grating period in x and y respectively. ΔL x and ΔL y are increase in the geometry of the nanostructures dictated by the Gaussian functions, where the total length of each structure is L 0 + ΔL x and L 0 + ΔL y for x-and-y dimensions respectively and L 0 is the initial length, 60 nm (same for both axes). (c,d) As previous, but with a 1D Gaussian profile. The inset in (d), (i) is of the RGB channels of one of the Gaussian rows exhibiting how each pixel encodes varying responses depending on the wavelength. (e,f) Show the encoding of a 2D Gaussian with first-order partial derivative and second-order derivatives (Laplacian operator) for orthogonal polarization states.
