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The operation of THz quantum cascade laser in the region of negative differential resistance |
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| Authors: | R.A. Khabibullin N.V. Shchavruk D.S. Ponomarev D.V. Ushakov A.A. Afonenko K.V. Maremyanin O.Yu. Volkov V.V. Pavlovskiy A.A. Dubinov |
| Affiliation: | 1. V.G. Mokerov Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow, Russia;2. Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, Russia;3. Belarusian State University, Minsk, Belarus;4. Institute for Physics of Microstructures of RAS, Nizhny Novgorod, Russia;5. Institute of Radio-Engineering and Electronics of RAS, Moscow, Russia |
| Abstract: | We investigate the light-current-voltage characteristics and emission spectra of 2.3 THz quantum cascade laser operating in the negative differential resistance (NDR) region. It was shown that the formation of electric field domains (EFDs) leads to a large number of discontinuities on the current-voltage and the total optical power on current characteristics. Measurements of emission spectra at different current (before the NDR region and in the NDR region) shows that the formation of EFDs results in decrease of the output intensity, but does not influence on Fabry-Perot multi-mode structure of THz QCL. The developed theoretical model predicts the formation of EFDs in the NDR region and qualitatively explain the experimental results. |
| Keywords: | Corresponding author. Quantum-cascade laser THz region Resonant-phonon design Negative differential resistivity |
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