A gold-titanium dioxide multilayer can compute the divergence, gradient, and Laplacian of an obliquely incident beam's transverse electric field in reflection.
Plasmonic transmitt ed optical differentiator based on the subwavelength gold gratings,
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Optical computation of the divergence of a vector field using a metal-dielectric multilayer
A gold-titanium dioxide multilayer can compute the divergence, gradient, and Laplacian of an obliquely incident beam's transverse electric field in reflection.