A superlattice comprising alternating layers of negative-refractive-index photonic crystals and positive-refractive-index dielectric media has been shown to exhibit an effective refractive index of ...

The refractive index of a material defines the angle through which light is bent when it travels between a material and the vacuum. Ordinary materials such as glass have refractive indices between one ...

Physicists at Harvard University in the US have built a silicon waveguide that exhibits a refractive index of, or close to, zero when operating at near-infrared telecom wavelengths. The waveguide can ...

Physicists in Germany claim to have found the first naturally occurring material that has a negative, rather than a positive, refractive index. The material -- a metallic ferromagnet -- is very ...

In the late 1960s, Russian physicist Victor Veselago pondered whether two key electromagnetic properties could ever be negative. In conventional materials, permeability and permittivity are always ...

Materials that have a negative refractive index at optical wavelengths have now been fabricated by scientists in Europe and the US for the first time. Rob van den Berg explains why they could ...

The phenomenon of zero refractive index, exhibited by ZIMs, has proven highly useful, especially in the fields of waveguiding and optics. Silicon carbide, classified as a polaritonic material, ...