Bending light stronger than ever before by accelerating electrons

ars technica: When it comes to light, certain types of fabricated materials behave in a radically different manner from ordinary materials like water and glass: they have negative refractive indices, so that light will travel in the opposite direction expected in normal materials. These negatively refracting materials can focus light effectively, even when the wavelength of the light is much larger than the device, allowing microscopic control of optical devices.

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