Above-band gap two-photon absorption and its influence on ultrafast carrier dynamics in ZnTe and CdTe

M. Schall, Peter Uhd Jepsen

Research output: Contribution to journalJournal articlepeer-review

Abstract

We present measurements of transient carrier dynamics subsequent to intense above-band gap femtosecond excitation of the II-VI compounds ZnTe and CdTe, probed in the far infrared by transient terahertz time-domain spectroscopy. The intensity and temperature dependence of the carrier dynamics illuminates the role of two-photon absorption (TPA) of pump photons. At cold temperatures and high excitation intensities TPA results in a photoexcited carrier distribution which requires several picoseconds to thermalize. As a consequence, the dielectric function of the carrier distribution deviates strongly from the Drude model for as long as 20 ps after excitation. (C) 2002 American Institute of Physics.
Original languageEnglish
JournalApplied Physics Letters
Volume80
Issue number25
Pages (from-to)4771-4773
Number of pages3
ISSN0003-6951
DOIs
Publication statusPublished - 24 Jun 2002
Externally publishedYes

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