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, Enzo Di Fabrizio

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


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.

Original languageBritish English
Pages (from-to)26088-26094
Number of pages7
JournalOptics Express
Issue number27
StatePublished - 19 Dec 2011


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