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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 27 — Dec. 19, 2011
  • pp: 26088–26094

Extremely large extinction efficiency and field enhancement in terahertz resonant dipole nanoantennas

Luca Razzari, Andrea Toma, Mostafa Shalaby, Matteo Clerici, Remo Proietti Zaccaria, Carlo Liberale, Sergio Marras, Ibraheem A. I. Al-Naib, Gobind Das, Francesco De Angelis, Marco Peccianti, Andrea Falqui, Tsuneyuki Ozaki, Roberto Morandotti, and Enzo Di Fabrizio  »View Author Affiliations

Optics Express, Vol. 19, Issue 27, pp. 26088-26094 (2011)

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The distinctive ability of nanometallic structures to manipulate light at the nanoscale has recently promoted their use for a spectacular set of applications in a wide range of areas of research including artificial optical materials, nano-imaging, biosensing, and nonlinear optics. Here we transfer this concept to the terahertz spectral region, demonstrating a metal nanostructure in shape of a dipole nanoantenna, which can efficiently resonate at terahertz frequencies, showing an effective cross section >100 times larger than its geometrical area, and a field enhancement factor of ~280, confined on a lateral section of ~λ/1,000. These results lead to immediate applications in terahertz artificial materials exhibiting giant dichroism, suggest the use of dipole nanoantennas in nanostructure-based terahertz metamaterials, and pave the way for nanoantenna-enhanced terahertz few-molecule spectroscopy and localized terahertz nonlinear optics.

© 2011 OSA

OCIS Codes
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(220.4241) Optical design and fabrication : Nanostructure fabrication
(250.5403) Optoelectronics : Plasmonics
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Optics at Surfaces

Original Manuscript: October 6, 2011
Revised Manuscript: November 18, 2011
Manuscript Accepted: November 21, 2011
Published: December 7, 2011

Virtual Issues
Vol. 7, Iss. 2 Virtual Journal for Biomedical Optics

Luca Razzari, Andrea Toma, Mostafa Shalaby, Matteo Clerici, Remo Proietti Zaccaria, Carlo Liberale, Sergio Marras, Ibraheem A. I. Al-Naib, Gobind Das, Francesco De Angelis, Marco Peccianti, Andrea Falqui, Tsuneyuki Ozaki, Roberto Morandotti, and Enzo Di Fabrizio, "Extremely large extinction efficiency and field enhancement in terahertz resonant dipole nanoantennas," Opt. Express 19, 26088-26094 (2011)

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