1.
Opt Express
; 19(17): 16154-9, 2011 Aug 15.
Article
in English
| MEDLINE
| ID: mdl-21934978
ABSTRACT
We propose a transformational design of an axi-symmetric gradient lens for electromagnetic waves. We show that a metamaterial consisting of toroidal air channels of diameters ranging from 23 nm to 190 nm in a matrix of Polymethylmethacrylate (PMMA) allows for a focussing effect of light over a large bandwidth i.e. [600-1000] nm. We finally propose a simplified design of lens allowing for a two-photon lithography implementation.