Individual nanoantennas loaded with three-dimensional optical nanocircuits

Na Liu, Fangfang Wen, Yang Zhao, Yumin Wang, Peter Nordlander, Naomi J. Halas, Andrea Aluì

Research output: Contribution to journalArticlepeer-review


Nanoantennas are key optical components that bridge nanometer-scale optical signals to far-field, free-space radiation. In analogy to radio frequency antennas where tuning and impedance-matching are accomplished with lumped circuit elements, one could envision nanoantenna properties controlled by nanoscale, optical frequency circuit elements in which circuit operations are based on photons rather than electrons. A recent investigation of the infrared nanocircuits has demonstrated the filtering functionality using dielectric gratings. However, these two-dimensional prototypes have limited applicability in real-life devices. Here we experimentally demonstrate the first optical nanoscale circuits with fully three-dimensional lumped elements, which we use to tune and impedance-match a single optical dimer nanoantenna. We control the antenna resonance and impedance bandwidth using suitably designed loads with combinations of basic circuit elements: nanoscale capacitors, inductors, and resistors. Our results pave the way toward extending conventional circuit concepts into the visible domain for applications in data storage, wireless optical links, and related venues.

Original languageEnglish (US)
Pages (from-to)142-147
Number of pages6
JournalNano Letters
Issue number1
StatePublished - Jan 9 2013
Externally publishedYes


  • Optical nanoantenna
  • circuit theory
  • high-precision lithography
  • metatronics
  • plasmonics
  • three-dimensional nanocircuit

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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