Highly Subwavelength, Superdirective Cylindrical Nanoantenna.

  title={Highly Subwavelength, Superdirective Cylindrical Nanoantenna.},
  author={Samel Arslanagi{\'c} and Richard W. Ziolkowski},
  journal={Physical review letters},
  volume={120 23},
A superdirective cylindrical nanoantenna is demonstrated with a multilayered cylindrical metamaterial-inspired structure. Targeting specific scattering coefficients for the dipole and higher-order modes, the ideal limit of needle radiation is demonstrated. A five-layer system is optimized to demonstrate its approach to the theoretical directivity bound. While the resulting structure is scalable to any frequency regime, its highly subwavelength overall size (λ_{0}/10) takes advantage of… 

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