Plasmonic nanoantenna arrays for the visible

Gold nanoantenna arrays composed of paired elliptical cylinders are fabricated and studied experimentally and numerically. The arrays show far-field spectra resonances in the visible range for two orthogonal polarizations. Finite element method is used to accurately simulate the far-field spectra with modified gold optical properties. The resonance wavelengths and electrical field enhancement are studied as functions of the antenna dimensions. The field enhancement is found to be inversely proportional to the gap size.