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Phys Rev Lett. 2008 Jul 25;101(4):043901. Epub 2008 Jul 21.

Input impedance, nanocircuit loading, and radiation tuning of optical nanoantennas.

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  • 1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. andreaal@ee.upenn.edu

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.

PMID:
18764328
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