Enhanced Directivity From Subwavelength Infrared/Optical Nano-Antennas Loaded With Plasmonic Materials or Metamaterials
Alu, A.
Engheta, N.
Pennsylvania Univ., Philadelphia;
This paper appears in: Antennas and Propagation, IEEE Transactions on
Publication Date: Nov. 2007
Volume: 55,
Issue: 11, Part 1
On page(s): 3027-3039
Location: St. Petersburg, Russia,
ISSN: 0018-926X
INSPEC Accession Number: 9674023
Digital Object Identifier: 10.1109/TAP.2007.908368
Current Version Published: 2007-11-12
Abstract
Here, we explore theoretically the concept of enhanced directivity from electrically small subwavelength radiators containing negative-parameter materials, such as plasmonic materials with negative permittivity at THz, infrared and optical frequencies. In particular, we study higher order plasmonic resonances of a subwavelength core-shell spherical nano-antenna, and we analyze the near-zone field distributions and far-field radiation patterns of such a structure when it is excited by a small dipole source, demonstrating analytically and numerically the possibility of having highly directive patterns from a nano-structure with electrically small dimensions. Radiation characteristics and intrinsic limitations on performance are analyzed in detail, and a potential application of this novel technique for super-resolution detection of the displacement of a nano-object is also pointed out.
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