Phys. Rev. Lett. 101, 043901 (2008) [4 pages]Input Impedance, Nanocircuit Loading, and Radiation Tuning of Optical NanoantennasReceived 17 October 2007; revised 17 April 2008; published 21 July 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.043901
DOI:
10.1103/PhysRevLett.101.043901
PACS:
42.79.Gn, 73.20.Mf, 78.67.−n, 84.40.Ba
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