Publication: Spectra of mode loss in THz quantum cascade laser with double metal waveguide based on Au, Cu and Ag
Дата
2019
Авторы
Khabibullin, R.
Ushakov, D.
Afonenko, A.
Shchavruk, N.
Vasil'Evskii, I.
Safonov, D.
Сафонов, Данил Андреевич
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© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.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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Spectra of mode loss in THz quantum cascade laser with double metal waveguide based on Au, Cu and Ag / Khabibullin, R. [et al.] // Progress in Biomedical Optics and Imaging - Proceedings of SPIE. - 2019. - 11066. - 10.1117/12.2523284
URI
https://www.doi.org/10.1117/12.2523284
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https://openrepository.mephi.ru/handle/123456789/18367
https://www.scopus.com/record/display.uri?eid=2-s2.0-85068485010&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000483491300038
https://openrepository.mephi.ru/handle/123456789/18367