Nanoscale plasmonic antenna difference formation implementation effect on field enhancement

In this article, different implementation of plasmonic nano-antenna for optical range is presented. Nano antennas are designed based on I, U, dual I and dual U metamaterial structures. Different models of nano-antenna are studied for E field density, transmission coefficient, ACS (absorption cross section) parameter and E2 enhancement for different wavelengths when linear polarization wave incident to nano antenna as a source field. Also, field enhancement and its relation with dual structure and comparison with single model are noticed. As shown here, single arrangement gives better field enhancement in comparison to dual structures but here we try to modify the result of dual U shape structure and enhancement of E field. On the other hand, benefits of U shape structure in nano-antenna design such as dual band characteristic and higher field enhancement are shown. At last different metamaterial formations to improve filed enhancement in this nano antenna is noticed here. The nano structures are based on deposition of silver layers on silicon-nitride substrate.