Slowdown of light due to exciton-polariton propagation in ZnO
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 83, no 24, 245212- p.Article in journal (Refereed) Published
By employing time-of-flight spectroscopy, the group velocity of light propagating through bulk ZnO is demonstrated to dramatically decrease down to 2044 km/s when photon energy approaches the absorption edge of the material. The magnitude of this decrease is found to depend on light polarization. It is concluded that even though the slowdown is observed in the vicinity of donor bound exciton (BX) resonances, the effect is chiefly governed by dispersion of free exciton (FX) polaritons that propagate coherently via ballistic transport. Based on the experimentally determined spectral dependence of the polariton group velocity, the polariton dispersion is accurately determined.
Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 83, no 24, 245212- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-69847DOI: 10.1103/PhysRevB.83.245212ISI: 000292254000003OAI: oai:DiVA.org:liu-69847DiVA: diva2:433444
Original Publication: Shula Chen, Weimin Chen and Irina Boyanova, Slowdown of light due to exciton-polariton propagation in ZnO, 2011, Physical Review B. Condensed Matter and Materials Physics, (83), 24, 245212. http://dx.doi.org/10.1103/PhysRevB.83.245212 Copyright: American Physical Society http://www.aps.org/2011-08-102011-08-082015-05-28