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Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

Abstract:

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 ...

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Publication status:
Published

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Publisher copy:
10.1063/1.4745044

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Journal:
JOURNAL OF APPLIED PHYSICS
Volume:
112
Issue:
3
Pages:
033517-033517
Publication date:
2012-08-01
DOI:
ISSN:
0021-8979
URN:
uuid:bc2c3de8-91fc-4de9-9377-a62ab2959639
Source identifiers:
351004
Local pid:
pubs:351004
Language:
English

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