Resonant light delay in GaN with ballistic and diffusive propagation

Details Resonant light delay in GaN with ballistic and diffusive propagation Resonant light delay in GaN with ballistic and diffusive propagation

2007-11-26

arxiv.org/abs/0711.3981v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.087402

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.

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