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Spectra of mode loss in THz quantum cascade laser with double metal waveguide based on Au, Cu and Ag
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Paper Abstract

The spectra of mode loss in terahertz quantum cascade laser (THz QCL) with double metal waveguide (DMW) based on Au, Cu and Ag have been analysed. On the basis of measurements of the resistivity of DMW claddings for the temperature range from 4.2 to 300 K, the loss coefficients of THz radiation at Au-, Cu-, Ag-claddings are calculated. We show that the Ag-based DMW allows to reduce the losses by 1.3–7.0 cm-1 in comparison with Au-based DMW at room temperature. Our calculations show that the Ag-based DMW has slightly lower losses (~1 cm-1) than Cu-based DMW at cryogenic temperatures (below 100 K). The use of Cu-based DMW allows to reduce the loss coefficient in comparison with Ag-based DMW at higher temperatures (above 100 K). Temperature dependence of threshold gain for THz QCL with Au-, Cu-, Ag-based DMW are calculated. Taking into account the absorption of THz radiation by free carriers and optical phonons, the spectrum of total mode loss of THz QCL with different thickness of n+-GaAs top contact layer are analyses.

Paper Details

Date Published: 3 June 2019
PDF: 6 pages
Proc. SPIE 11066, Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling, 1106613 (3 June 2019); doi: 10.1117/12.2523284
Show Author Affiliations
R. Khabibullin, Institute of Ultra High Frequency Semiconductor Electronics (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)
D. Ushakov, Belarusian State Univ. (Belarus)
A. Afonenko, Belarusian State Univ. (Belarus)
N. Shchavruk, Institute of Ultra High Frequency Semiconductor Electronics (Russian Federation)
D. Ponomarev, Institute of Ultra High Frequency Semiconductor Electronics (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)
I. Vasil’evskii, National Research Nuclear Univ. MEPhI (Russian Federation)
D. Safonov, National Research Nuclear Univ. MEPhI (Russian Federation)
A. Dubinov, Institute for Physics of Microstructures (Russian Federation)


Published in SPIE Proceedings Vol. 11066:
Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling
Vladimir L. Derbov, Editor(s)

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