Plasmonic nanoloop array antenna.
In this Letter, we create an optical nanoantenna array composed of parasitic plasmonic loops that can enhance radiation characteristics and direct the optical energy successfully. Three metallic loops inspired by the concept of the Yagi-Uda antenna are optimized around the region where they feature high scattering performance to control the radiation beam. The loop geometry, when compared to the dipole configuration, has the benefit of using the available aperture in an effective way to provide higher directivity. The angular emission of the nanoloop array antenna is highly directive, and a directivity of 8.2 dB for upward radiation is established.
Applied EM and Optics Laboratory, ECE Department, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
Akram
A
Ahmadi
Hossein
H
Mosallaei