Physicists in the US have demonstrated negative refraction at optical wavelengths for the first time. Vladimir Shalaev and colleagues at Purdue University obtained the result in a material consisting ...

Light is the ultimate means of sending information to and from the interior structure of materials — it packages data in a signal of zero mass and unmatched speed. However, light is, in a sense, ...

A PLATE of biaxial crystal cut approximately normal to the axis of single-ray velocity has the remarkable property of forming optical images of an illuminated object held in front of it. This effect ...