Abstract
Two optical antenna designs incorporating structures termed charge and current reservoirs are proposed to realize localized high electric and magnetic field enhancement, respectively. Simulation results show that the fan-rod electric antenna design combines the advantages of the rod antenna and the bowtie antenna, and has higher field enhancement than either. The performance of a loop shaped magnetic antenna consisting of a pair of metallic strips with offsets is also verified numerically, with high magnetic field enhancement being observed in the simulation. In both of the designs, the concepts of charge and current reservoirs contribute to high electric and magnetic field enhancement.
Highlights
The extension of antenna concepts into the optical spectral range has been explored
We proposed two optical antennas with charge and current reservoirs: the fan-rod electric antenna and the loop shaped magnetic antenna with offsets
The charge reservoirs enable the fan-rod electric antenna to combine the advantages of the rod antenna and the bowtie antenna
Summary
The extension of antenna concepts into the optical spectral range has been explored. Through different designs of optical antennas, localized field enhancement can be conveniently realized over a range of wavelengths [1,2,3,4,5,6,7,8,9]. A fan-rod antenna design with charge reservoirs is proposed to realize high field enhancement in its gap and low enhancement at its outer edge simultaneously. In addition to the fan-rod electric antenna design, a loop shaped optical magnetic antenna design with current reservoirs for realizing large magnetic field enhancement is proposed in this paper. The concepts of charge and current reservoirs contribute to high electric and magnetic field enhancement in both optical antenna designs
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