|Title||Planar, flattened Luneburg lens at infrared wavelengths|
|Publication Type||Journal Article|
|Year of Publication||2012|
|Authors||Hunt, John, Tyler Talmage, Dhar Sulochana, Tsai Yu-Ju, Bowen Patrick, Larouche Stéphane, Jokerst Nan M., and Smith D. R.|
|Journal Title||Optics Express|
|Short Title||Opt. Express|
Employing artificially structured metamaterials provides a means of circumventing the limits of conventional optical materials. Here, we use transformation optics (TO) combined with nanolithography to produce a planar Luneburg lens with a flat focal surface that operates at telecommunication wavelengths. Whereas previous infrared TO devices have been transformations of free-space, here we implement a transformation of an existing optical element to create a new device with the same optical characteristics but a user-defined geometry.