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Long delays of light in ZnO caused by exciton-polariton propagation

✍ Scribed by S. L. Chen; W. M. Chen; I. A. Buyanova

Publisher
John Wiley and Sons
Year
2012
Tongue
English
Weight
446 KB
Volume
249
Category
Article
ISSN
0370-1972

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✦ Synopsis

Abstract

We study the propagation of exciton‐polaritons through bulk ZnO using time‐resolved photoluminescence (PL) complemented by time‐of‐flight measurements of laser pulses. When the photon energy approaches donor bound exciton resonances, substantial time delays in PL light propagation are observed which reach up to 210 ps for a 0.55 mm thick crystal. By comparing results from time‐of‐flight measurements performed using PL light and laser pulses, the observed delay is shown to be due to the formation of exciton‐polaritons and their spectral dispersion. It is also shown that the main contribution to the slow‐down effect arises from free exciton‐polaritons, whereas bound exciton‐polaritons become important only in close vicinity to the corresponding resonances.

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