Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy
نویسندگان
چکیده
laser structures using femtosecond pump-probe spectroscopy Axel Bruchhausen, James Lloyd-Hughes, Mike Hettich, Raphael Gebs, Martin Grossmann, Oliver Ristow, Albrecht Bartels, Milan Fischer, Mattias Beck, Giacomo Scalari, J erôme Faist, Alok Rudra, Pascal Gallo, Eli Kapon, and Thomas Dekorsy Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457, Germany Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland Laboratory of Physics of Nanostructures, Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland
منابع مشابه
Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique
Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were me...
متن کاملHigh-speed asynchronous optical sampling for high-sensitivity detection of coherent phonons
A new optical pump-probe technique is implemented for the investigation of coherent acoustic phonon dynamics in the GHz to THz frequency range which is based on two asynchronously linked femtosecond lasers. Asynchronous optical sampling (ASOPS) provides the performance of on all-optical oscilloscope and allows us to record optically induced lattice dynamics over nanosecond times with femtosecon...
متن کاملFemtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-time-delays without mechanical delay line
We demonstrate a technique for femtosecond time-resolved optical pump-probe spectroscopy that allows to scan over a nanosecond time delay at a kilohertz scan rate without mechanical delay line. Two mode-locked femtosecond lasers with approximately 1 GHz repetition rate are linked at a fixed difference frequency of fR=11 kHz. One laser delivers the pump pulses, the other provides the probe pulse...
متن کاملUltrafast Spectroscopy of Fano-Like Resonance between Optical Phonon and Excitons in CdSe Quantum Dots: Dependence of Coherent Vibrational Wave-Packet Dynamics on Pump Fluence
The main goal of the present work is to study the coherent phonon in strongly confined CdSe quantum dots (QDs) under varied pump fluences. The main characteristics of coherent phonons (amplitude, frequency, phase, spectrogram) of CdSe QDs under the red-edge pump of the excitonic band [1S(e)-1S3/2(h)] are reported. We demonstrate for the first time that the amplitude of the coherent optical long...
متن کاملDynamics of coherent acoustic and optical phonon oscillations in nanostructures studied by a femtosecond pump-probe technique
Coherent phononic oscillations in Bi and Ag nanowires were studied with a femtosecond pump-probe technique. In Bi nanowires laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the THz range. The transmission of nanowires on a glass substrate and the light scattered from free standing nanowires were measured. In Ag nanowires l...
متن کامل