Picosecond Ultrasonic Observation of Zone-Folded Acoustic Phonons in THz Quantum Cascade Lasers

AXEL BRUCHHAUSEN; MIKE HETTICH; JAMES LLOYD-HUGHES; JÉRÔME FAIST; THOMAS DEKORSY

Taipei

Conferencia; 13th International Conference on Phonon Scattering in Condensed Matter (Phonons 2010); 2010

National Taiwan University & PHONONS

We have investigated the vibrational properties of quantum cascade lasers by means of ultrafast laser spectroscopy. By the observation of the acoustic folded branches, and by analyzing the involved phonon modes it is possible to extract accurate structural information of this devices, important for their design and performance