Extinction of coherent backscattering by a disordered photonic crystal with a Dirac spectrum

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dc.creatorSepkhanov, R. A.
dc.creatorOssipov, A.
dc.creatorBeenakker, C. W. J.
dc.date2008-10-01
dc.date2009-01-07
dc.date.accessioned2026-07-07T12:31:50Z
dc.date.available2026-07-07T12:31:50Z
dc.descriptionPhotonic crystals with a two-dimensional triangular lattice have a conical singularity in the spectrum. Close to this so-called Dirac point, Maxwell's equations reduce to the Dirac equation for an ultrarelativistic spin-1/2 particle. Here we show that the half-integer spin and the associated Berry phase remain observable in the presence of disorder in the crystal. While constructive interference of a scalar (spin-zero) wave produces a coherent backscattering peak, consisting of a doubling of the disorder-averaged reflected photon flux, the destructive interference caused by the Berry phase suppresses the reflected intensity at an angle which is related to the angle of incidence by time-reversal symmetry. We demonstrate this extinction of coherent backscattering by a numerical solution of Maxwell's equations and compare with analytical predictions from the Dirac equation.
dc.description4 pages, 3 figures; slightly expanded new version
dc.identifierhttps://arxiv.org/abs/0810.0124
dc.identifierhttp://arxiv.org/abs/0810.0124
dc.identifierEPL 85, 14005 (2009)
dc.identifierdoi:10.1209/0295-5075/85/14005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216580
dc.subjectMesoscale and Nanoscale Physics
dc.subjectOptics
dc.titleExtinction of coherent backscattering by a disordered photonic crystal with a Dirac spectrum
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