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Doppler Effect Reversed

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MELBOURNE, Australia, March 9, 2011 — By demonstrating the reversal of the optical Doppler effect, researchers may have advanced invisibility cloak technology. They did this using a laser beam and a photonic crystal "superprism." In physics, the Doppler effect describes the change in frequency of light or sound waves whenever there is a relative movement between an observer and a wave’s source. Most people have experienced the Doppler effect in relation to sound: When a train is coming toward you, the sound frequency increases, whereas the frequency decreases as the train moves away. Min Gu, director of...Read full article

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    Published: March 2011
    Glossary
    doppler effect
    The effect produced on a wave frequency because of the relative motion of a source or an observer. The radiation emitted from a source that moves away from an observer appears to be of lower frequency than the radiation emitted from a stationary source. The radiation emitted from a source moving toward the observer appears to be of a higher frequency than that from a stationary source.
    AustraliaBaohua JiaCenter for Micro-PhotonicsChinaDoppler effectfrequency of lightinvisibility cloakLaser BeamMin Gunanostructured crystalphotonic crystalSensors & DetectorssuperprismSwinburne UniversityUniversity of ShanghaiXiangping Li

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