Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"intersubband"”.
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Quantum well intersubband photodetectors in focal plane arrays
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Development of intersubband terahertz lasers using multiple quantum well structures
… and theoretical effort in developing intersubband THz lasers using multiple-quantum-well structures. Scarcity of compact solid state sources in this frequency range, and to demonstrate a novel unipolar laser technology, motivated this research. Transport studies for realizing THz …
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Infrared absorption in doped semiconductors due to direct intersubband transitions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Intrawell and interwell intersubband transitions in single and multiple quantum well heterostructures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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A multisubband self-consistent two-dimensional numerical model for Hemt including intersubband and intrasubband scattering mechanisms in the quantum well
The previous one-subband model is extended to include transport of electrons in the quantum well with two subbands. The two higher moments of Boltzmann Transport Equations are solved for the two lowest subbands and the bulk system. The Schrodinger's and Poisson's Equations are solved …
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MULTICOLOR INFRARED DETECTION USING STEP QUANTUM WELLS
… well infrared photodetectors (QWIPs) based on intersubband transitions are widely investigated in recent years. Due to the mature III-V material and processing technology, great progress has been made successfully for the fabrication of large scale quantum well infrared focal plane arrays …
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Time-resolved Raman scattering in GaAs multiple quantum well structures
This thesis describes an optical study of the intersubband relaxation of carriers in GaAs multiple quantum well structures. For this investigation the application of the conventional Raman scattering technique was extended to the picosecond time domain. Inelastic light scattering from the …
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Kopplung von kollektiven Anregungen in einlagigen und doppellagigen quasi-zweidimensionalen Elektronensystemen
… Nachweis von optischen und akustischen Intersubband-Plasmonen in zweilagigen Elektronensystemen sowie eine detaillierte Analyse der Kopplung von Intersubband-Plasmonen an optische Phononen und an strahlende Gittermoden im Bereich der Rayleigh-Anomalie.
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Theory of terahertz intervalence band polaritons and antipolaritons.
… interaction of terahertz (THz) radiation with intersubband excitations in microcavities leading to THz polaritons and antipolaritons. The approach is based on the dielectric function formalism. The dielectric constant is derived from an optical susceptibility evaluated with Non Equilibrium Many …
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GaAs/AlGaAs far-infrared quantum cascade laser
… of the lower THz laser level to aid the intersubband laser population inversion. Interband recombination occurs by means of stimulated emission, thus combining an interband (~1550 me V) and intersubband (~16-18 meV) laser. As the subband properties of both the valence band and the …
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Iii-V Multiple Quantum Well Long-Wavelength Infrared Detectors
… of the research provide information of III-V intersubband optoelectronic properties which are fundamental to the future sensitive, low-cost, large long wavelength infrared focal-plane arrays.
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Carrier relaxation in doped quantum wells
… interactions of the electrons and phonons. The intersubband relaxation time of an electron is numerically evaluated considering electron-electron and electron-phonon (bulk LO-phonon) scattering in a GaAs quantum well. It is shown that the intersubband relaxation time is significantly influenced …
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Development of terahertz quantum-cascade lasers
… laser (QCL) emits photons due to electronic intersubband transitions in the quantum-wells of a semiconductor heterostructure. The operation of terahertz QCLs at frequencies below the Reststrahlen band in the semiconductor ( ... ), is significantly more challenging as compared to that of the …
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Monte Carlo Simulation Of Hole Transport And Terahertz Amplification In Multilayer Delta Doped Semiconductor Structures
… and GaAs. A far-infrared laser concept based on intersubband transitions of holes in p-type periodically delta-doped semiconductor films is studied using numerical Monte-Carlo simulation of hot hole dynamics. The considered device consists of monocrystalline pure Ge layers periodically …
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Fabrication of nonlithographic semiconductor quantum wire infrared photodetector
… The infrared photodetectors are based on intersubband transitions in semiconductor quantum wires and have the potential for higher operational temperature, increased signal-to-noise ratio, reduced dark current, wider spectral range and sensitivity to normal incident radiation. The quantum …
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Design of quantum well infrared photodetectors
… to elucidate the physical origin of the intersubband absorption of normally incident radiation. A key result of this work is the derivation within the framework of k p theory of selection rules for the intersubband absorption of normally incident radiation by hole subbands in a p-QWIP …
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Engineered quantum dots for infrared photodetectors
… (LWIR) regime. These detectors are based on intersubband transitions in self-assembled InAs quantum dots (QDs) and offer several advantages such as normal incidence detection, low dark currents and high operating temperatures, while enjoying all the benefits of a mature GaAs fabrication …
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Study of quantum dot and quantum well photodetectors
… study investigates infrared detectors based on intersubband transitions in a novel InAs/In0.15 Ga0.85 As/GaAs quantum dots-in-well (DWELL) heterostructure. In the DWELL structure, the InAs quantum dots are placed in an In0.15 Ga0.85 As well, which in turn is placed in GaAs quantum well with …
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Design, fabrication and characterization of terahertz quantum-well photodetectors
… (FPA). In this thesis project, the theory of the intersubband transition and carrier transport in a THz QWP is studied. The designe, fabrication, measurement-system buildup, and characterization are performed. In addition, the design and fabrication process of THz QWP-LED are also carried out. …
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