Open Access
Review
Issue
EPJ Applied Metamaterials
Volume 1, 2014
Article Number 7
Number of page(s) 12
DOI http://dx.doi.org/10.1051/epjam/2015001
Published online 18 March 2015

© Y. Yang et al., Published by EDP Sciences, 2015

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.