Two-photon photoconductive terahertz generation in ZnSe

We report on the generation of free-space terahertz (THz) radiation using polycrystalline ZnSe as the photoconductive (PC) substrate. It is found that the ZnSe emitter can be operated at peak fields up to 125 kV/cm without dielectric breakdown, and can be photoexcited (through two-photon absorption)...

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Bibliographic Details
Published in:Applied physics letters 2003-10, Vol.83 (14), p.2967-2969
Main Authors: Holzman, J. F., Elezzabi, A. Y.
Format: Article
Language:English
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Summary:We report on the generation of free-space terahertz (THz) radiation using polycrystalline ZnSe as the photoconductive (PC) substrate. It is found that the ZnSe emitter can be operated at peak fields up to 125 kV/cm without dielectric breakdown, and can be photoexcited (through two-photon absorption) at pump energy fluences up to 28 mJ/cm2 without saturating. The relationship between the THz field strength and the excitation conditions of the PC gap are interpreted through a photocarrier transport model.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1616206