Results 241 to 250 of about 1,513,497 (299)

Trions in Quantum Wells

Few-Body Systems, 2001
The ground-state energy of three-particle systems consisting of electrons and holes as found in semiconducting quantum wells is studied. The degree of confinement is determined by the quantum-well width and we can vary the dimensionality of the system from two to three dimensions.
Peeters, François, Riva, Clara, Varga, K.   +2 more
openaire   +3 more sources

Terahertz quantum well photodetectors

SPIE Proceedings, 2005
SPIE OpticsEast, 24-28 October 2005 ...
Springthorpe, Anthony, Liu, Hui, Luo, H., Song, C., Wasilewski, Zbigniew   +4 more
openaire   +2 more sources

Terahertz Quantum Well Photodetectors

IEEE Journal of Selected Topics in Quantum Electronics, 2006
The terahertz (THz) part of the electromagnetic spectrum promises a wide range of new and novel, some may be disruptive, applications. However, the development of technologies in the THz spectrum or the very far infrared region has been slow mainly because of the lack of convenient detectors and lasers.
H. Luo, H. C. Liu, C. Y. Song, Z. R. Wasilewski, A. J. SpringThorpe, J. C. Cao   +5 more
openaire   +1 more source

Terahertz quantum-well photodetectors

Infrared Physics & Technology, 2004
The design and projected performance of quantum-well infrared photodetectors (QWIP) for the terahertz (1–10 THz) or the very-far-infrared region are presented together with our initial demonstration of a GaAs/AlGaAs QWIP working at photon energies below the optical phonons. We point out the problem with this initial device, discuss possible causes, and
Liu, Hui, Song, C. Y., Springthorpe, Anthony, Cao, J. C.   +3 more
openaire   +2 more sources

Quantum Well Shape Modification in Quaternary Quantum Wells

MRS Proceedings, 1991
ABSTRACTQuantum well interdiffusion has been employed, for the First time in the quaternary InGaAsP/InP system (grown lattice matched to InP substrates), in order to modify the as-grown, nominally square, shapes of single quantum wells so as to increase their bandgap energies.
Emil S. Köteles, A. N. M. Masum Choudhury, A. Levy, B. Elman, P. Melman, M. A. Koza, R. Bhat   +6 more
openaire   +1 more source

QUANTUM BEATS OF EXCITONS IN QUANTUM WELLS

Modern Physics Letters B, 1990
We briefly review our recent observations of quantum beats of excitons in quantum wells. The quantum beats are observed as an oscillatory structure in the polarization decay of energetically closely spaced excitons which are coherently excited by ultrashort laser pulses.
, Göbel, , Leo, , Damen, , Shah, , Schmitt-Rink, , Schäfer, , Müller, , Köhler   +7 more
openaire   +2 more sources

Transient photoluminescence spectra of GaAs/AlGaAs quantum wells, quantum well wires, and quantum well boxes

Chinese Physics Letters, 1990
The interaction of the electrons with the phonons in GaAs/AlGaAs quantum wells, quantum well wires, and quantum well boxes has been studied by meansuring their time resolved photoluminescence (PL) spectra. In the quantum well (QW) system, relaxation time of the electron energy of the narrower well is shorter than that of the wider well.
Cheng Wenqin, Huang Yi, Zhou Junming, Feng Wei, Wang Hezhou, She Weilong, Huang Xuguang, Lin Weizhu, Yu Zhenxin, Xu Geng   +9 more
openaire   +1 more source

Quantum control in quantum wells

Physical Review B, 1998
We present calculations of quantum control of wave packet motion and THz emission in an asymmetric double-quantum-well structure. A genetic algorithm is used to search for the laser pulse that best drives an electronic wave packet to a desired target, or goal.
Jeffrey L. Krause, David H. Reitze, Gary D. Sanders, Alex V. Kuznetsov, Christopher J. Stanton   +4 more
openaire   +1 more source

Nonlinear gain effects in quantum well, quantum well wire, and quantum well box lasers

IEEE Journal of Quantum Electronics, 1991
The nonlinear gain effects due to the spectral hole burning in quantum well (QW), quantum well wire (QWW), and quantum well box (QWB) lasers are discussed. It is found that the gain nonlinearity is enhanced by the quantum confinement of carriers, and is further enhanced in the QWW and QWB lasers.
T. Takahashi, Y. Arakawa
openaire   +1 more source

Polarization-insensitive quantum well optoelectronic devices using quantum well shape modification

SPIE Proceedings, 1997
Polarization insensitive 1.5 micrometer QW optical amplifiers, modulators, and detectors were fabricated using a novel, simple, post-growth, integratable technique. The process utilizes ion-implantation-induced, spatially selective, quantum well (QW) shape modification.
Koteles, Emil S., He, J. J., Charbonneau, S., Poole, P. J., Aers, G. C., Feng, Y., Goldberg, R. D., Mitchell, I. V.   +7 more
openaire   +1 more source