Optical response of oriented and highly anisotropic subwavelength metallic nanostructure arrays

Abstract

Here we describe the optical response of highly anisotropic subwavelength coatings with Au structures based on the open-ring-resonator and fabricated via nanoimprint lithography and metal sputtering. This approach allows fabrication of dense arrays of oriented nanostructures over large areas with a resonance in the visible wavelength range. Nanostructures are wire-like, with a nanoscale L-shaped cross section approximately 70 nm in width. The coatings exhibit a resonant transmission response that is highly angle and polarization dependent. Experimental results are presented along with complementary numerical modeling results predicting the resonance shift with corresponding changes in fabrication parameters.