A new way to measure the light-warping properties of hyperbolic metamaterials
(PHYSorg.com Physics)

Manipulating light in a variety of ways-shrinking its wavelength and allowing it to travel freely in one direction while stopping it cold in another-hyperbolic metamaterials have wide application in optical communications and as nanoparticle sensors. But some of the same optical properties that make these metamaterials so appealing make them frustratingly difficult to evaluate.