The sub-wavelength plasmonic nano-antenna based on cross structure

In this article, a new combination of a loop and cross structure as a sub-wavelength plasmonic nano-antenna is presented. Loop antenna and a model of cross nano-antenna as well as their combination are studied in this paper. Three different models of plasmonic cross sections are employed in this article for absorption, as simple loop, simple cross junction and finally in combination of these two structures. To achieve high field enhancement and dual resonances, a bent cross-junction structure is combined with ring structure. New cross-junction ring structure represents two resonances at 45 THz and 86 THz. In the new model, E2 increases extremely to more than 20,000 (V/m)2 at 88 THz. Absorption cross section (ACS) shows great enhancement at 88 THz, where E2 has the maximum rate.