Controlling terahertz radiation with nanoscale metal barriers embedded in nano slot antennas

Hyeong Ryeol Park, Young Mi Bahk, Kwang Jun Ahn, Q. Han Park, Dai Sik Kim, Luis Martín-Moreno, Francisco J. García-Vidal, Jorge Bravo-Abad

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Nanoscale metallic barriers embedded in terahertz (THz) slot antennas are shown to provide unprecedented control of the transition state arising at the crossover between the full- and half-wavelength resonant modes of such antennas. We demonstrate strong near-field coupling between two paired THz slot antennas separated by a 5 nm wide nanobarrier, almost fully inducing the shift to the resonance of the double-length slot antenna. This increases by a factor of 50 the length-scale needed to observe similar coupling strengths in conventional air-gap antennas (around 0.1 nm), making the transition state readily accessible to experiment. Our measurements are in good agreement with a quantitative theoretical modeling, which also provides a simple physical picture of our observations.

Original languageEnglish
Pages (from-to)8340-8345
Number of pages6
JournalACS nano
Issue number10
Publication statusPublished - 2011 Oct 25


  • nanoparticle detection
  • paired antenna
  • subskin depth barrier
  • terahertz nano slot antenna
  • terahertz spectroscopy

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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