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Photonic crystals move into new areas Although they were discovered almost 20 years ago, photonic crystals are still proving to be a remarkably fertile area of physics research. In the past week researchers from the US and the Netherlands have made the first three-dimensional photonic quasicrystals, while another US team has used a photonic band-gap structure to accelerate electrons. Photonic crystals are materials in which a periodic variation of the dielectric constant results in a photonic band-gap.
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