Sub-wavelength focusing meta-lens
Optics
2015-06-12 v1
Abstract
We show that planar a plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into sub-wavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2{\lambda}) in diameter when illuminated by a wavelength of 800 nm. We attribute the occurrence of sub-wavelength hotspots beyond the near field to the phenomenon of superoscillation.
Cite
@article{arxiv.1211.1496,
title = {Sub-wavelength focusing meta-lens},
author = {Tapashree Roy and Edward T. F. Rogers and Nikolay I. Zheludev},
journal= {arXiv preprint arXiv:1211.1496},
year = {2015}
}