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 ...

The original goal was to investigate biological samples on a molecular scale – but this soon led to stubborn technical problems. Eventually, however, the researchers realized that the very source of ...

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Recent experiments that demonstrate the negative refraction of light could bring a heated scientific debate to a close, and give negative-index materials a positive future Figure 1: Negative-index ...