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

R. Khabibullin; D. Ushakov; A. Afonenko; N. Shchavruk; D. Ponomarev; I. Vasil’evskii; D. Safonov; A. Dubinov

doi:10.1117/12.2523284

3 June 2019 Spectra of mode loss in THz quantum cascade laser with double metal waveguide based on Au, Cu and Ag

R. Khabibullin, D. Ushakov, A. Afonenko, N. Shchavruk, D. Ponomarev, I. Vasil’evskii, D. Safonov, A. Dubinov

Proceedings Volume 11066, Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling; 1106613 (2019) https://doi.org/10.1117/12.2523284
Event: International Symposium on Optics and Biophotonics VI: Saratov Fall Meeting 2018, 2018, Saratov, Russian Federation

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.

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R. Khabibullin, D. Ushakov, A. Afonenko, N. Shchavruk, D. Ponomarev, I. Vasil’evskii, D. Safonov, and A. Dubinov "Spectra of mode loss in THz quantum cascade laser with double metal waveguide based on Au, Cu and Ag", Proc. SPIE 11066, Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling, 1106613 (3 June 2019); https://doi.org/10.1117/12.2523284

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KEYWORDS

Terahertz radiation

Quantum cascade lasers

Silver

Gold

Copper

Waveguides

Metals

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