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

• DOI: 10.1364/oe.19.026088
• Publication Date: 2011-12-07T20:02:19Z
• Authors: Luca Razzari; Andrea Toma; Mostafa Shalaby; Matteo Clerici; Remo Proietti Zac...; Carlo Liberale; Sergio Marras; Ibraheem A. I. Al...; Gobind Das; Francesco De Angelis; Marco Peccianti; Andrea Falqui; Tsuneyuki Ozaki; Roberto Morandotti; Enzo Di Fabrizio
• Keywords: Terahertz gap; Biophotonics

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