Zobrazeno 1 - 10
of 55
pro vyhledávání: '"W. Parz"'
Autor:
W. Schrenk, Michel Calligaro, J. Darmo, C. Deutsch, Gottfried Strasser, Alexander Benz, Xavier Marcadet, J. Kroll, Harvey E. Beere, David A. Ritchie, W. Parz, Aaron Maxwell Andrews, Karl Unterrainer, Thomas Müller, M. Martl, Damien P. Kelly, Gernot Fasching, Carlo Sirtori, S. S. Dhillon
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 14:307-314
In this review, we report on the study of terahertz (THz) intersubband (ISB) transitions and on the optical devices based on them. We use time-resolved THz spectroscopy to examine ISB optical transitions in semiconductor quantum wells and quantum cas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8671979cf37bbd3b7b495284569e0f7
https://doi.org/10.1109/jstqe.2008.915528
https://doi.org/10.1109/jstqe.2008.915528
Publikováno v:
physica status solidi c. 6:876-878
In this work femtosecond spectral hole burning spectroscopy is used to resonantly excite ground state excitons in an ensemble of self-assembled InAs/GaAs quantum dots with a strong pump pulse. Two fundamental coherent nonlinear effects are observed w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62e3d146bed0a416cfb1395aa7a2613f
https://doi.org/10.1002/pssc.200880637
https://doi.org/10.1002/pssc.200880637
Publikováno v:
Semiconductor Science and Technology. 19:S287-S289
We present time-resolved measurements of photoinduced intraband absorption in undoped GaAs/AlGaAs quantum well and InAs/GaAs self-assembled quantum dot structures after interband excitation. By using ultrabroadband mid-infrared pulses we determine th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::743fb89a952d5142f3df293c02516a02
https://doi.org/10.1088/0268-1242/19/4/096
https://doi.org/10.1088/0268-1242/19/4/096
Publikováno v:
Applied Physics Letters. 84:64-66
We report the measurement of the transient intersubband absorption in a coupled quantum well semiconductor structure. Pulsed interband excitation is used to prepare a coherent population in the two lowest states of a three level system of electronic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de81f262872be05000bc93134c38b7cb
https://doi.org/10.1063/1.1638881
https://doi.org/10.1063/1.1638881
Autor:
John W. Cockburn, J.S. Roberts, Gottfried Strasser, Karl Unterrainer, Andrey B. Krysa, Thomas Müller, W. Parz, Luke R. Wilson, M. Austerer, J. Darmo
Publikováno v:
2010 IEEE Photonics Society Winter Topicals Meeting Series (WTM).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66ea4f5e325e16854b9db7f429740135
https://doi.org/10.1109/photwtm.2010.5421992
https://doi.org/10.1109/photwtm.2010.5421992
Autor:
W. Parz, A. J. Lopes, José M. Villas-Bôas, Nelson Studart, Karl Unterrainer, T. Gebhard, Patricia L. Souza, Mauricio P. Pires
Publikováno v:
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference.
In this work, the authors presented the results of a detailed optical characterization of specially designed stacked self-assembled InAs/InGaAlAs/InGaAs/InP QDIP structures grown by metalorganic vapor phase epitaxy. The QDIP active region consists of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b73cd78f1ce8cdca89c84d79db757d02
https://doi.org/10.1109/cleoe-iqec.2007.4387030
https://doi.org/10.1109/cleoe-iqec.2007.4387030
Publikováno v:
Physical Review B. 70
Using ultrafast terahertz spectroscopy, we measure the temporal evolution of the intersubband absorption spectrum of a $\mathrm{GaAs}∕{\mathrm{Al}}_{0.3}{\mathrm{Ga}}_{0.7}\mathrm{As}$ double-quantum-well structure with an energy spacing between th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7102c7b56d2ea4cc2d22a125e2bab4d0
https://doi.org/10.1103/physrevb.70.155324
https://doi.org/10.1103/physrevb.70.155324
Publikováno v:
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences. 362(1815)
We report on new schemes for terahertz (THz) generation. The THz efficiency of photoconducting antennas can be increased by using a cavity effect for the near-infrared pump beam. The cavity is formed by a molecular beam epitaxy grown semiconductor Br
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::862a962502d3434a561a59465b1d94b3
https://pubmed.ncbi.nlm.nih.gov/15306518
https://pubmed.ncbi.nlm.nih.gov/15306518
Publikováno v:
Proceedings, IEEE Tenth International Conference on Terahertz Electronics.
Presents time-resolved measurements of photoinduced intersubband absorption in an undoped GaAs/AlGaAs coupled quantum well excited by an ultrashort interband optical pulse. An interband pump pulse injects electrons into the first and second subband o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7f13bf9d83bd9e28f8cb498f750c524
https://doi.org/10.1109/thz.2002.1037584
https://doi.org/10.1109/thz.2002.1037584
Autor:
John W. Cockburn, Andrey B. Krysa, Karl Unterrainer, T. Müller, W. Parz, J.S. Roberts, Luke R. Wilson, Reza Haddad
Publikováno v:
Semiconductor Science and Technology. 26:014020
In this work we present phase-resolved measurements of the stimulated emission process in a quantum cascade laser emitting at 11.7 µm. In particular, we are focusing on the temperature performance of the intersubband gain in a spectrally broad regio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::401ab67b3ca18b65788f9b919dfe4fc5
https://doi.org/10.1088/0268-1242/26/1/014020
https://doi.org/10.1088/0268-1242/26/1/014020