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

Razzari, L. et al. (2011) Extremely large extinction efficiency and field enhancement in terahertz resonant dipole nanoantennas. Optics Express, 19(27), pp. 26088-26094. (doi: 10.1364/OE.19.026088) (PMID:22274197)

111924.pdf - Accepted Version



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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Clerici, Professor Matteo
Authors: Razzari, L., Toma, A., Shalaby, M., Clerici, M., Zaccaria, R. P., Liberale, C., Marras, S., Al-Naib, I. A. I., Das, G., De Angelis, F., Peccianti, M., Falqui, A., Ozaki, T., Morandotti, R., and Di Fabrizio, E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Copyright Holders:Copyright © 2011 OSA
First Published:First published in Optics Express 19(27):26088-26094
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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