Abstract: A plasmonically enhanced electro-optic device includes a dielectric layer; a plurality of nanopillars arranged in a periodic array such that each nanopillar has a protruding portion that extends beyond a surface of the dielectric layer; a metallic layer formed on the surface of the dielectric layer and on portions of the plurality of nanopillars by an oblique directional deposition such that the metallic layer defines a periodic array of nano-holes and nano-antennas, each nano-hole of the periodic array of nano-holes being in a deposition shadow region of a corresponding nanopillar; and an electrode electrically connected to at least one nanopillar of the plurality of nanopillars at an end opposing the protruding portion thereof.