Proceedings, IEEE Tenth International Conference on Terahertz Electronics
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Terahertz generation in negative-effective-mass diodes
Theoretically studied current self-oscillations and spatiotemporal current
patterns in quantum-well (QW) negative-effective-mass (NEM) p/sup +/pp/sup +/
diodes when the electric field is applied along the direction of the well. The
origin of current self-oscillations is the formation and traveling of
electric-field domains in the well. In the calculations we have accurately
considered scattering c...
#Semiconductor diodes #Phonons #Dispersion #Optical scattering #Spatiotemporal phenomena #Doping #Light scattering #Effective mass #Equations #Steady-state
Numerical image enhancement for THz time-domain spectroscopy
Applies numerical image enhancement methods to THz time-domain spectroscopy
images in order to improve the quality of experimental data suffering from low
resolution and finite focus diameter aperture effects. As an example, the level
of detail in a biomedical image of a histopathological sample is shown to
increase significantly.
#Image enhancement #Time domain analysis #Spectroscopy #Spatial resolution #Apertures #Image resolution #Biomedical imaging #Visualization #High-resolution imaging #Focusing
Achromatically injection-seeded terahertz-wave parametric generator
An achromatically injection-seeded terahertz-wave parametric generator (ais-TPG)
was constructed using MgO:LiNbO/sub 3/ crystals and a tunable seeder using a
stationary dispersion-compensated optical arrangement. Without readjusting the
mirrors, smooth tuning of the terahertz-wave over the 0.6/spl sim/2.6 THz range
was obtained by adjusting the seeder wavelength alone. The feasibility of this
syst...
#Optical frequency conversion #Gratings #Tunable circuits and devices #Laser tuning #Optical resonators #Frequency conversion #Telescopes #Lenses #Nonlinear optics #Optical pumping
THz 2002. 2002 IEEE Tenth International Conference on Terahertz Electronics Proceedings (Cat. No.02EX621)
- 2002
Presents the front cover of the proceedings record.
Enhancement of THz emission from semiconductor surfaces
We have studied the generation of coherent pulses of terahertz (THz) radiation
from semiconductor surfaces both experimentally and using a Monte-Carlo carrier
dynamics simulation. Collimated THz beams are observed from surface-field THz
emitters and three methods of improving the efficiency of these emitters are
demonstrated: (i) by applying a magnetic field, (ii) by reducing the effective
refract...
#Surface emitting lasers #Semiconductor lasers #Optical pulses #Quantum cascade lasers #Optical pulse generation #Photonic band gap #Charge carrier processes #Gas lasers #Power lasers #Laser excitation
Coherent THz synchrotron radiation at BESSY II
A new technology for generating high quality and powerful terahertz (THz)
radiation is presented. Coherent THz synchrotron radiation is produced in a 'low
alpha' optics mode of the synchrotron light source BESSY II. The radiated power
grows with the square of the beam current. Compared to the normal, incoherent
emission process the power grows up to 100,000 times in the range of 03-1.2 THz
(10 cm/...
#Synchrotron radiation #Electrons #Storage rings #Mirrors #Power generation #Stimulated emission #Frequency #Shape control #Compaction #Optical beams
High performance HBV multipliers monolithically integrated onto a host quartz substrate
Fully integrated monolithic circuits incorporating InP-based heterostructure
barrier varactor (HBV) frequency multipliers have been fabricated via epitaxial
lift-off and transfer-substrate techniques onto a quartz substrate. We have
obtained a maximum output power of 6 mW at 288 GHz corresponding to an overall
efficiency of 6%. In addition we have observed a 45 GHz 3 dB bandwidth centered
around 3...
#Substrates #Frequency #Circuits #Diodes #Indium gallium arsenide #Varactors #Bandwidth #Matched filters #Filtering #Millimeter wave devices
Detection of terahertz radiation by plasma waves in field effect transistors
We review our recent experimental and theoretical studies of the detection of
terahertz radiation in GaAs/AlGaAs heterostructure field effect transistors
(FET's) in a wide range of temperatures (8-300 K) and for frequencies ranging
from 0.1 THz to 0.6 THz. The resonant detection of 0.6 THz radiation by the
two-dimensional electron plasma confined in 0.15 /spl mu/m gate length
GaAs/AlGaAs field eff...
#Radiation detectors #Plasma waves #FETs #Gallium arsenide #Plasma temperature #Plasma confinement #HEMTs #MODFETs #Temperature distribution #Frequency
Differential imaging using a THz-wave parametric oscillator
We demonstrate THz-wave imaging using a widely tunable THz-wave parametric
oscillator. Two Si-bolometer detectors were used to obtain stable measurements.
The imaging system was controlled by a PC using the program Labview. The targets
of the THz-wave imaging were a T-shaped piece of polyethylene and a P-shaped
piece of Teflon within an envelope that was opaque for visible light. We
obtained clear...
#Oscillators #Laser tuning #Optical imaging #Frequency #Laser excitation #Mirrors #Biomedical imaging #Optical pulse generation #Tunable circuits and devices #Light scattering
T-ray tomographic imaging
Summary form only given. We present three terahertz wave (T-ray) tomographic
imaging modalities: T-ray computed tomography (T-ray CT), T-ray diffractive
tomography (T-ray DT), and tomographic imaging with a Fresnel binary lens. T-ray
CT provides 3-dimensional (3D) images and reveals information about the target
for functional imaging. T-ray DT achieves sub-mm spatial resolution, and a
binary lens ...
#Optical imaging #Computed tomography #Lenses #Image reconstruction #Frequency #Probes #Biological tissues #Spatial resolution #Focusing #Chirp