Sat, 05 Jul 2008 12:49:35 BST CiteULike: dhbradshaw's periodic http://www.citeulike.org/user/dhbradshaw/tag/periodic CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dhbradshaw/article/2208781 <i>Physical Review Letters, Vol. 91, No. 13. (2003), 133901.</i><br /><br />Nonrelativistic reversed Doppler shifts have never been observed in nature and have only been speculated to occur in pathological systems with simultaneously negative effective permittivity and permeability. This Letter presents a different; new physical phenomenon that leads to a nonrelativistic reversed Doppler shift in light. It arises when light is reflected from a moving shock wave propagating through a photonic crystal. In addition to reflection of a single frequency; multiple discrete reflected frequencies or a 10 GHz periodic modulation can also be observed when a single carrier frequency of wavelength 1   μm is incident. Reversed Doppler Effect in Photonic Crystals Evan Reed Marin Soljačić John Joannopoulos doi:10.1103/PhysRevLett.91.133901 Physical Review Letters, Vol. 91, No. 13. (2003), 133901. 2008-01-08T20:49:06-00:00 2003 Physical Review Letters 91 13 133901 American Physical Society doppler doppler-paper periodic