Planar, flattened Luneburg lens at infrared wavelengths.
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.
Hunt, J; Tyler, T; Dhar, S; Tsai, Y-J; Bowen, P; Larouche, S; Jokerst, NM; Smith, DR
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