physica status solidi (b)

Cover image for Vol. 254 Issue 5

Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)

Online ISSN: 1521-3951

Associated Title(s): physica status solidi (a), physica status solidi (c), physica status solidi (RRL) - Rapid Research Letters

249_07b/2012Back Cover: Long delays of light in ZnO caused by exciton-polariton propagation (Phys. Status Solidi B 7/2012)

ZnO has in recent years been a subject of extensive research efforts driven by the prospect for a variety of potential applications. Recently a dramatic decrease in the group velocity of light propagating through bulk ZnO was demonstrated by time-of-flight studies of laser pulse propagation [Phys. Rev. B 83, 245212 (2011)]. By directly comparing the propagation of both photoluminescence (PL) and laser pulses, Chen et al. show that this effect is caused by the formation of free-exciton polaritons and is determined by their dispersion, whereas contributions of the bound-exciton polaritons become important only in close proximity of the corresponding resonances (see the article on pp. 1307–1311). The cover figure presents transient PL images measured from bulk ZnO within the spectral range of bound exciton recombination (I6 and I7 lines) in conventional back-scattering geometry (a) and in a forward-transmission configuration (b), i.e. during time-of-flight. The solid line in (b) represents time delays after propagation of light through the ZnO media, calculated by taking into account the formation of the exciton polaritons.

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