Freeze-out of difference-phonon modes in ZnTe and its application in detection of THz pulses

M. Schall, Peter Uhd Jepsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Generation by optical rectification and detection by electro-optic sampling of freely propagating subpicosecond electromagnetic pulses (terahertz pulses) in ZnTe is limited by two broad difference-phonon absorption bands in the spectral region below the transverse optical resonance at 5.32 THz. In this letter, we show that, at temperatures below 80 K, these difference modes are frozen out and consequently ZnTe becomes completely transparent within our detection bandwidth. We utilize this effect to obtain a three-fold increase in detection efficiency at frequencies above 3 THz in a thin ZnTe detector operated at 80 K, compared to the performance at room temperature. (C) 2000 American Institute of Physics. [S0003-6951(00)02944-2].
Original languageEnglish
JournalApplied Physics Letters
Volume77
Issue number18
Pages (from-to)2801-2803
Number of pages3
ISSN0003-6951
DOIs
Publication statusPublished - 30 Oct 2000
Externally publishedYes

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