A comparative study of resonant effects in two-dimensional active coated nano-particles of circular, polygonal, and elliptical shapes

The area of passive and active nano-antennas has recently attracted great attention due to their potentials in a large variety of applications. Numerous designs were proposed; both the traditional ones, inspired by their microwave counterparts, as well as those making extensive use of metamaterial and plasmonic structures. In regards to the latter, extensive analytical and numerical investigations were conducted on the theoretical designs of nano-antennas by use of passive and active coated nano-particles (CNPs) of various shapes and excitations. It was demonstrated that specifically designed active CNPs possess highly resonant properties making them useful candidates for a variety of nano-antenna designs.