TY - GEN
T1 - The Response of Split-Well Direct-Phonon THz Quantum-Cascade Laser Structures to Changes in Doping
AU - Gower, N. Lander
AU - Piperno, S.
AU - Albo, A.
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - We have studied the effect of doping on the temperature performance of a split-well (SW) direct-phonon (DP) terahertz (THz) quantum-cascade laser (QCL) scheme supporting a clean three-level system. We expected to obtain a similar improvement in the temperature performance to that observed in resonant-phonon (RP) schemes after increasing the carrier concentration from 3 × 1010cm-2 to 6 × 1010, cm-2 To our surprise, in the devices we checked, the results show the contrary. However, we observed a significant increase in gain broadening and a reduction in the dephasing time as the doping and temperature increased. We attribute these effects to enhanced ionized-impurity scattering (IIS). The observation and study of effects related to dephasing included in our experimental work have previously only been possible via simulation.
AB - We have studied the effect of doping on the temperature performance of a split-well (SW) direct-phonon (DP) terahertz (THz) quantum-cascade laser (QCL) scheme supporting a clean three-level system. We expected to obtain a similar improvement in the temperature performance to that observed in resonant-phonon (RP) schemes after increasing the carrier concentration from 3 × 1010cm-2 to 6 × 1010, cm-2 To our surprise, in the devices we checked, the results show the contrary. However, we observed a significant increase in gain broadening and a reduction in the dephasing time as the doping and temperature increased. We attribute these effects to enhanced ionized-impurity scattering (IIS). The observation and study of effects related to dephasing included in our experimental work have previously only been possible via simulation.
UR - https://www.scopus.com/pages/publications/85139860305
U2 - 10.1109/IRMMW-THz50927.2022.9895500
DO - 10.1109/IRMMW-THz50927.2022.9895500
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AN - SCOPUS:85139860305
T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
BT - IRMMW-THz 2022 - 47th International Conference on Infrared, Millimeter and Terahertz Waves
PB - IEEE Computer Society
T2 - 47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022
Y2 - 28 August 2022 through 2 September 2022
ER -