characterization of asymmetric tapered dipole nanoantenna for energy harvesting applications

In this paper, systematic study for asymmetric tapered dipole nanoantenna is implemented using finite element frequency domain (fefd) solver where harvesting efficiency, field confinement, surface current, and input impedance are calculated at wavelength of 500 nm. the proposed nanoantennas achieve a harvesting efficiency of 61.3% and a field enhancement factor of 37.7 over the conventional dipole nanoantenna. this enhancement is attributed to the irregularity of the surface current distribution on the asymmetric designs. particle swarm optimization technique is used to find the optimum design geometrical parameters through an external link between the optimization algorithm and the fefd solver. moreover, the proposed designs offer a resonance impedance of 500 ω to match that of fabricated rectifiers. further study of the structure fabrication tolerance is included which shows the robustness of the proposed nanoantennas.