Input Impedance, Nanocircuit Loading, and Radiation Tuning of Optical Nanoantennas

Andrea Alù and Nader Engheta
Phys. Rev. Lett. 101, 043901 – Published 21 July 2008
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Abstract

Here we explore the radiation features of optical nanoantennas, analyzing the concepts of optical input impedance, optical radiation resistance, impedance matching, and loading of plasmonic nanodipoles. We discuss how the concept of antenna impedance may be applied to optical frequencies and how its quantity may be properly defined and evaluated. We exploit these concepts in the optimization of nanoantenna loading by optical nanocircuit elements, extending classic concepts of radio-frequency antenna theory to the visible regime for the proper design and matching of plasmonic nanoantennas.

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  • Received 17 October 2007

DOI:https://doi.org/10.1103/PhysRevLett.101.043901

©2008 American Physical Society

Authors & Affiliations

Andrea Alù* and Nader Engheta

  • Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

  • *andreaal@ee.upenn.edu
  • To whom correspondence should be addressed. engheta@ee.upenn.edu

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Issue

Vol. 101, Iss. 4 — 25 July 2008

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