Abstract
The results of time-domain spectroscopy of the terahertz (THz) generation in a structure with an In0.38Ga0.62As photoconductive layer are presented. This structure grown by molecular-beam epitaxy on a GaAs substrate using a metamorphic buffer layer allows THz generation with a wide frequency spectrum (to 6 THz). This is due to the additional contribution of the photo-Dember effect to THz generation. The measured optical-to-terahertz conversion efficiency in this structure is 10–5 at a rather low optical fluence of ~40 μJ/cm2, which is higher than that in low-temperature grown GaAs by almost two orders of magnitude.
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Original Russian Text © D.S. Ponomarev, R.A. Khabibullin, A.E. Yachmenev, P.P. Maltsev, M.M. Grekhov, I.E. Ilyakov, B.V. Shishkin, R.A. Akhmedzhanov, 2017, published in Fizika i Tekhnika Poluprovodnikov, 2017, Vol. 51, No. 4, pp. 535–539.
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Ponomarev, D.S., Khabibullin, R.A., Yachmenev, A.E. et al. Terahertz radiation in In0.38Ga0.62As grown on a GaAs wafer with a metamorphic buffer layer under femtosecond laser excitation. Semiconductors 51, 509–513 (2017). https://doi.org/10.1134/S1063782617040170
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DOI: https://doi.org/10.1134/S1063782617040170