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Physical Review Letters – 26 September 2003
Volume 91, Issue 13

Illustration of an anomalous Doppler effect in a photonic crystal: a computer-simulated light pulse (left-pointing arrow) reflects off a shock front moving to the right (green line). Frequency is plotted along the vertical axis. The reflected pulse has multiple, equally spaced frequencies above and below that of the incident pulse. [Evan J. Reed, Marin Soljačić, and John D. Joannopoulos, Phys. Rev. Lett. 91, 133901 (2003)]

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