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)
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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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| 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: | 1094-4087 |
| 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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