title: Far-field analysis of axially symmetric three-dimensional directional cloaks.
abstract: Axisymmetric radiating and scattering structures whose rotational invariance is broken by non-axisymmetric excitations present an important class of problems in electromagnetics. For such problems, a cylindrical wave decomposition formalism can be used to efficiently obtain numerical solutions to the full-wave frequency-domain problem. Often, the far-field, or Fraunhofer region is of particular interest in scattering cross-section and radiation pattern calculations; yet, it is usually impractical to compute full-wave solutions for this region. Here, we propose a generalization of the Stratton-Chu far-field integral adapted for 2.5D formalism. The integration over a closed, axially symmetric surface is analytically reduced to a line integral on a meridional plane. We benchmark this computational technique by comparing it with analytical Mie solutions for a plasmonic nanoparticle, and apply it to the design of a three-dimensional polarization-insensitive cloak.
authors.affiliation: Center for Metamaterials and Integrated Plasmonics, and Department of Electrical and Computer Engineering, Duke University, Durham NC 27708, USA. cristian.ciraci@duke.edu
authors.forename: Cristian
authors.initials: C
authors.lastname: Ciracì
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Urzhumov
authors.forename: David R
authors.initials: DR
authors.lastname: Smith
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*