Volume 85, Number 1, January 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||16 January 2009|
Extinction of coherent backscattering by a disordered photonic crystal with a Dirac spectrum
Instituut-Lorentz, Universiteit Leiden - P.O. Box 9506, 2300 RA Leiden, The Netherlands, EU
2 School of Mathematical Sciences, University of Nottingham - University Park, Nottingham, NG7 2RD, UK, EU
Corresponding author: email@example.com
Accepted: 9 December 2008
Photonic 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- 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.
PACS: 42.25.Dd – Wave propagation in random media / 42.25.Hz – Interference / 42.70.Qs – Photonic bandgap materials
© EPLA, 2009
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