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Material Gives Visible Light an Infinite Wavelength

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A new metamaterial made from stacks of silver and silicon nitride nanolayers gives visible light a nearly infinite wavelength, an international team reports. The material could be used to make novel optical components or more efficient LEDs. Light’s phase velocity (how the peaks and valleys of the wave move) and group velocity (the transport of energy) dictate how it propagates in a material. Energy transport is limited to the speed of light, according to Einstein’s laws, but there are no physical limitations on the phase velocity. When it reaches zero, meaning there is no...Read full article

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