Phys. Rev. Lett. 100, 087402 (2008) [4 pages]Resonant Light Delay in GaN with Ballistic and Diffusive PropagationReceived 7 September 2007; revised 19 November 2007; published 26 February 2008 We report on a strong delay in light propagation through bulk GaN, detected by time-of-flight spectroscopy. The delay increases resonantly as the photon energy approaches the energy of a neutral-donor bound exciton (BX), resulting in a velocity of light as low as 2100 km/s. In the close vicinity of the BX resonance, the transmitted light contains both ballistic and diffusive components. This phenomenon is quantitatively explained in terms of optical dispersion in a medium where resonant light scattering by the BX resonance takes place in addition to the polariton propagation. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.087402
DOI:
10.1103/PhysRevLett.100.087402
PACS:
78.20.Ci, 78.40.Fy
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