Excitation of Dark Mode in Asymmetric Dimer Metamaterial

Abstract

We study the excitation of dark resonance modes in a planar metamaterial nano dimer of unit cell made up of double asymmetric nano rods. In this study, experimental and numerical results show the presence of the dark and bright modes in the asymmetric nano dimer metamaterial, whereas only the bright mode is excitable in the symmetric dimer. The sharp asymmetric profile of the dark modes with a Fano-type resonance opens up potential applications of the dimer metamaterial as an optical nano sensor.