1. Extremely large extinction efficiency and field enhancement in terahertz resonant dipole nanoantennas.
- Author
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Razzari L, Toma A, Shalaby M, Clerici M, Zaccaria RP, Liberale C, Marras S, Al-Naib IA, Das G, De Angelis F, Peccianti M, Falqui A, Ozaki T, Morandotti R, and Di Fabrizio E
- Subjects
- Materials Testing, Metal Nanoparticles chemistry, Metal Nanoparticles ultrastructure, Terahertz Radiation
- Abstract
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.
- Published
- 2011
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