Share Email Print
cover

Proceedings Paper

Intersubband impact ionization in THz QWIPs: shaping band structure reorganizations to design novel detectors
Author(s): A. Delga; F. R. Jasnot; A. Buffaz; H. Guo; L. Doyennette; L. A. de Vaulchier; Z. R. Wasilewski; H. C. Liu; V. Berger
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Electronic transport in AlGaAs/GaAs THz Quantum Wells Intersubband Photodetectors (QWIPs) exhibits two different regimes separated by huge discontinuities (up to five orders of magnitude) in the resistivity. They are interpreted in terms of band structure reorganizations triggered by intersubband impact ionization. We will analyze and model their in uence on the electronic transport. The magnitude of the transport modifications is explained by the small transition energy and the sharpness of the electrons distribution at stake in THz QWIPs. Measurements under magnetic field or temperature show that the broadening of the electron distribution damps the effects of impact ionization. Some experimental features of the electronic transport of shorter wavelength detectors are then reproduced. The use of intersubband impact ionization in THz QWIPs to design high gain and fast novel detectors is discussed.

Paper Details

Date Published: 24 January 2011
PDF: 9 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79450W (24 January 2011); doi: 10.1117/12.870923
Show Author Affiliations
A. Delga, Lab. Matériaux et Phénomènes Quantiques, CNRS, Univ. Paris Diderot (France)
F. R. Jasnot, Lab. Pierre Aigrain, Ecole Normale Supérieure (France)
A. Buffaz, Lab. Matériaux et Phénomènes Quantiques, CNRS, Univ. Paris Diderot (France)
H. Guo, National Research Council Canada (Canada)
L. Doyennette, Lab. Matériaux et Phénomènes Quantiques, CNRS, Univ. Paris Diderot (France)
L. A. de Vaulchier, Lab. Pierre Aigrain, Ecole Normale Supérieure (France)
Z. R. Wasilewski, National Research Council Canada (Canada)
H. C. Liu, National Research Council Canada (Canada)
V. Berger, Lab. Matériaux et Phénomènes Quantiques, CNRS, Univ. Paris Diderot (France)


Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

© SPIE. Terms of Use
Back to Top