Publikation: Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy
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2012
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Lloyd-Hughes, James
Fischer, Milan
Scalari, Giacomo
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Journal of Applied Physics. 2012, 112(3), 033517. ISSN 0021-8979. eISSN 1089-7550. Available under: doi: 10.1063/1.4745044
Zusammenfassung
The dynamics of acoustic vibrations in terahertz quantum cascade laser structures (THz-QCLs) is studied by means of femtosecond pump-probe spectroscopy. The phonon modes are characterized by the folding of the acoustic dispersion into an effective reduced Brillouin zone. An accurate identification of this dispersion allows the sample structure and periodicity to be determined with high precision on the order of 0.1%. By temperature tuning the energy of the electronic levels of the system and performing wavelength dependent measurements, we are able to study the impulsive resonant generation and detection of coherent acoustic phonon modes. These results are supported by simulations of the electronic system that well explain the experimental observations. The effects of interface (IF) roughness on coherent acoustic phonon spectra are clearly observed for equal nominal THz-QCL structures but with different interface qualities.
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530 Physik
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high-speed optical techniques, millimetre wave lasers, optical pumping, phonons, probes, quantum cascade lasers, visible spectroscopy
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BRUCHHAUSEN, Axel, James LLOYD-HUGHES, Mike HETTICH, Raphael GEBS, Martin GROSSMANN, Oliver RISTOW, Albrecht BARTELS, Milan FISCHER, Matthias BECK, Giacomo SCALARI, Jérôme FAIST, Alok RUDRA, Pascal GALLO, Eli KAPON, Thomas DEKORSY, 2012. Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy. In: Journal of Applied Physics. 2012, 112(3), 033517. ISSN 0021-8979. eISSN 1089-7550. Available under: doi: 10.1063/1.4745044BibTex
@article{Bruchhausen2012Inves-20546,
year={2012},
doi={10.1063/1.4745044},
title={Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy},
number={3},
volume={112},
issn={0021-8979},
journal={Journal of Applied Physics},
author={Bruchhausen, Axel and Lloyd-Hughes, James and Hettich, Mike and Gebs, Raphael and Grossmann, Martin and Ristow, Oliver and Bartels, Albrecht and Fischer, Milan and Beck, Matthias and Scalari, Giacomo and Faist, Jérôme and Rudra, Alok and Gallo, Pascal and Kapon, Eli and Dekorsy, Thomas},
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<dcterms:abstract xml:lang="eng">The dynamics of acoustic vibrations in terahertz quantum cascade laser structures (THz-QCLs) is studied by means of femtosecond pump-probe spectroscopy. The phonon modes are characterized by the folding of the acoustic dispersion into an effective reduced Brillouin zone. An accurate identification of this dispersion allows the sample structure and periodicity to be determined with high precision on the order of 0.1%. By temperature tuning the energy of the electronic levels of the system and performing wavelength dependent measurements, we are able to study the impulsive resonant generation and detection of coherent acoustic phonon modes. These results are supported by simulations of the electronic system that well explain the experimental observations. The effects of interface (IF) roughness on coherent acoustic phonon spectra are clearly observed for equal nominal THz-QCL structures but with different interface qualities.</dcterms:abstract>
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