Sub-nanosecond delay of light in (Cd,Zn)Te crystal

Details Sub-nanosecond delay of light in (Cd,Zn)Te crystal Sub-nanosecond delay of light in (Cd,Zn)Te crystal

2010-07-09

arxiv.org/abs/1007.1675v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

We study excitonic polariton relaxation and propagation in bulk CdZnTe using time- resolved photoluminescence and time-of-flight techniques. Propagation of picosecond optical pulses through 0.745 mm thick crystal results in time delays up to 350 ps, depending on the photon energy. Optical pulses with 150 fs duration become strongly stretched. The spectral dependence of group velocity is consistent with the dispersion of the lower excitonic polariton branch. The lifetimes of excitonic polariton in the upper and lower branches are 1.5 and 3 ns, respectively.

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