Resonant light delay in GaN with ballistic and diffusive propagation
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 100, no 8Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2008. Vol. 100, no 8
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-45904DOI: 10.1103/PhysRevLett.100.087402OAI: oai:DiVA.org:liu-45904DiVA: diva2:266800