Scattering efficiency and near field enhancement of active semiconductor plasmonic antennas at terahertz frequencies

Vincenzo Giannini, Audrey Berrier, Stefan A. Maier, José Antonio Sánchez-Gil, Jaime Gómez Rivas

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118 Citations (Scopus)

Abstract

Terahertz plasmonic resonances in semiconductor (indium antimonide, InSb) dimer antennas are investigated theoretically. The antennas are formed by two rods separated by a small gap. We demonstrate that, with an appropriate choice of the shape and dimension of the semiconductor antennas, it is possible to obtain large electromagnetic field enhancement inside the gap. Unlike metallic antennas, the enhancement around the semiconductor plasmonics antenna can be easily adjusted by varying the concentration of free carriers, which can be achieved by optical or thermal excitation of carriers or electrical carrier injection. Such active plasmonic antennas are interesting structures for THz applications such as modulators and sensors.

Original languageEnglish
Pages (from-to)2797-2807
Number of pages11
JournalOptics Express
Volume18
Issue number3
DOIs
Publication statusPublished - 1 Feb 2010
Externally publishedYes

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