Now showing items 81-90 of 169
Spatial conductivity mapping of carbon nanotube composite thin films by electrical impedance tomography for sensing applications
(IOP Publishing Ltd, 2007-08-08)
This paper describes the application of electrical impedance tomography (EIT) to demonstrate the multifunctionality of carbon nanocomposite thin films under various types of environmental stimuli. Carbon nanotube (CNT) ...
Study of InGaAs-based modulation doped field effect transistor structures using variable-angle spectroscopic ellipsometry
(Elsevier, 1991-12-10)
Variable-angle spectroscopic ellipsometry was used to estimate the thickness of all layers within the optical penetration depth of InGaAs-based modulation doped field effect transistor structures. Strained and unstrained ...
Time-resolved observation of ballistic acceleration of electrons in GaAs quantum wells
(IOP Publishing Ltd, 1992-03-01)
The authors have studied high-field parallel transport of photoinjected carriers in GaAs quantum wells using femtosecond optical spectroscopy. They have directly observed the transient nonequilibrium distribution functions ...
Resonant-tunneling devices for millimeter-wave generation
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1989-06)
Oscillations from resonant-tunneling diodes have been observed up to 200 GHz, and theoretical estimates predict that device performance should extend into the THz range. This paper addresses the issue of the ultimate ...
Growth phenomena and characteristics of strained InxGa1-xAs on GaAs
(Elsevier, 1989-02-02)
We have investigated the molecular beam epitaxial growth, structural and optical properties of InGaAs on GaAs. We have focused first on the initial stages of growth where the growth is expected to be under coherent strain ...
Hard X-ray generation from solids driven by relativistic intensity in the lambda-cubed regime
(Springer-Verlag, 2006-04)
Interaction of relativistic intensity laser pulses encompassed at focus by a volume of a few wavelengths cubed with solids is examined. Spectroscopy of hard X-rays of several metallic targets, including Cu, Ge, Mo, Ag, and ...
Electro-optic effect in strained and lattice matched multiquantum well structures -- Role of excitonic resonances
(Elsevier, 1990)
The well known quantum confined Stark effect (QCSE) is currently being exploited to design optoelectronic devices based on electric field controlled absorption of photons. QCSE is also responsible for strong below exciton ...
Bias circuit instabilities and their effect on the d.c. current-voltage characteristics of double-barrier resonant tunneling diodes
(Elsevier, 1991-02)
Bias circuit stability has important implications for the study and application of double-barrier resonant tunneling structures. Stability criteria for resonant tunneling diodes are investigated for the common bias circuit ...
GaN/air gap based micro-opto-electro-mechanical (MOEM) Fabry-PÉrot filters
(WILEY-VCH Verlag, 2007-06)
Structural and optical properties of Fabry-PÉrot filters (FPFs) with GaN/air gap based distributed Bragg reflectors (DBRs) were studied. Reflectance of GaN/air gap DBRs on sapphire substrate was calculated from the standard ...
High-speed quantum dot lasers
(IOP Publishing Ltd, 2005-07-07)
The modulation bandwidth of conventional 1.0–1.3 µm self-organized In(Ga)As quantum dot (QD) lasers is limited to ∼6–8 GHz due to hot carrier effects arising from the predominant occupation of wetting layer/barrier states ...