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Proceedings Paper

Experimental study of terahertz emission from ZnSe and ZnTe nanostructures
Author(s): Xiaoshu Chen; Shan He; Xiao Jun Wu; Fu Li Zhao; Gang Wang; Reng Wang
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Paper Abstract

Terahertz (THz) emission from ZnSe and ZnTe nano dots and nano gratings is experimentally studied compared with that from <111> orientation bulk ZnSe and <110> orientation bulk ZnTe. These nano dots and nano gratings are fabricated by the femtosecond laser ablation technique. Three main mechanisms coexist in the THz radiation from ZnSe and ZnTe surface nano structures as the same as from bulk sample: current surge effect (drift current), Photo Dember effect (diffusion current), and optical rectification. Moreover, it is found that nano structures not only contribute to an enhancement of THz emission, but also increase the threshold of polarity reversal of THz wave, and widen the spectrum of THz radiation. We also observe a two-fold symmetry in rotating pump polarization angle from ZnTe nano gratings, which is completely different from the three-fold symmetry observed from bulk ZnTe.

Paper Details

Date Published: 8 February 2008
PDF: 10 pages
Proc. SPIE 6840, Terahertz Photonics, 684015 (8 February 2008);
Show Author Affiliations
Xiaoshu Chen, Sun Yat-Sen Univ. (China)
Shan He, Sun Yat-Sen Univ. (China)
Xiao Jun Wu, Sun Yat-Sen Univ. (China)
Fu Li Zhao, Sun Yat-Sen Univ. (China)
Gang Wang, Sun Yat-Sen Univ. (China)
Reng Wang, Shanghai Institute of Technical Physics (China)

Published in SPIE Proceedings Vol. 6840:
Terahertz Photonics
Cunlin Zhang; Xi-Cheng Zhang, Editor(s)

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