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 similar to 280, confined on a lateral section of similar to lambda/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. (C)2011 Optical Society of America

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

Clerici M;
2011-01-01

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 similar to 280, confined on a lateral section of similar to lambda/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. (C)2011 Optical Society of America
2011
Razzari, L; Toma, A; Shalaby, M; Clerici, M; Zaccaria, Rp; Liberale, C; Marras, S; Al-Naib, Iai; Das, G; De Angelis, F; Peccianti, M; Falqui, A; Ozaki, T; Morandotti, R; Di Fabrizio, E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2161036
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