A5019675340- Nuclear physics research studies
- Advanced MEMS and NEMS Technologies
- Photonic and Optical Devices
- Nuclear Physics and Applications
- Force Microscopy Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Mechanical and Optical Resonators
- Particle physics theoretical and experimental studies
- Semiconductor Lasers and Optical Devices
- Atomic and Molecular Physics
- Semiconductor Quantum Structures and Devices
- Adhesion, Friction, and Surface Interactions
- High-Energy Particle Collisions Research
- Photorefractive and Nonlinear Optics
- Optical Coatings and Gratings
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Microfluidic and Capillary Electrophoresis Applications
- Radiation Detection and Scintillator Technologies
- Astronomical and nuclear sciences
- Acoustic Wave Resonator Technologies
- Superconducting and THz Device Technology
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Nanofabrication and Lithography Techniques
Vanderbilt Health
2024
National Institute for Research and Development in Microtechnologies
2013-2022
Lanxess (Germany)
2016
Technische Universität Ilmenau
2005-2012
Fraunhofer Society
2011
Carl Zeiss (Germany)
2006
ETH Zurich
1990-2005
Jet Propulsion Laboratory
1994-2004
California Institute of Technology
2001-2004
Space Micro (United States)
1991-2002
Abstract This article reviews the current knowledge on main properties and applications of hydrogen in LiNbO3. The review is divided into three parts. first devoted to general such as methods defect production control, techniques used for their detection characterization, well interactions with other lattice defects. second part considers central role played by OH- defects fabrication optical waveguides protonexchange method. Conditions exchange process, structure exchanged layers,...
We report monolithic array oscillators incorporating Schottky-collector resonant tunnel diodes (SRTD's). In the SRTD, a 0.1-μm width Schottky collector contact provides greatly reduced device series resistance, resulting in an estimated 2.2 THz maximum frequency of oscillation. A 64-element oscillator oscillated at 650 GHz while 16-element produced 28 μW 290 GHz.
A novel velocity-matched distributed photodetector (VMDP) is proposed to simultaneously achieve high saturation photocurrent and broad bandwidth. Theoretical analysis on the tradeoff between power bandwidth shows that VMDP offers fundamental advantages over conventional photodetectors. comprehensive theoretical model has been developed for design simulation of VMDP. Experimentally, with very (56-mA) instrument-limited 3-dB (49 GHz) demonstrated. The experimental results show attractive...
Parity nonconservation in pp scattering has been studied by measuring the helicity dependence of cross section, ${A}_{z}$=(${\ensuremath{\sigma}}^{+}$-${\ensuremath{\sigma}}^{\ensuremath{-}}$)/(${\ensuremath{\sigma}}^{+}$+${\ensuremath{\sigma}}^{\ensuremath{-}}$), for longitudinally polarized incident protons 45 MeV. We found ${A}_{z}$=(-1.50\ifmmode\pm\else\textpm\fi{}0.22)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ angular range 23\ifmmode^\circ\else\textdegree\fi{}...
Unbiased gold nanoparticles are negatively charged in aqueous solution but not hydrated. Optical spectroscopy of voltage-clamped single reveals evidence that anion adsorption starts at positive potentials above the point zero charge, causing severe reversible plasmon damping combination with a spectral red shift exceeding linear double layer charging effect. Plasmon by adsorbate is relevant for use catalysis, biodiagnostics, and surface enhanced Raman scattering.
This letter reports the fabrication and demonstration of an ErAs:GaAs interdigitated photomixer as a tunable THz source ranging from ∼20GHzto∼2THz, with 12μW maximum power typically around ∼90GHz. Each is coupled to composite dipole-spiral planar antenna that emits Gaussian-type beam into free space. The switches dipole spiral behavior frequency increases. A distributed Bragg reflector embedded in device beneath increase its external quantum efficiency. has 900Å thick silicon nitride coating...
A high-power, high-bandwidth photodetector is experimentally demonstrated using a novel velocity-matched distributed (VMDP). The structure can achieve large absorption volume and high-saturation power while maintaining the high-speed performance of fast photodiodes. VMDP with 56 mA saturation photocurrent an instrument-limited 3-dB bandwidth 49 GHz achieved. results show that ideal for high-performance microwave fiber-optic links high-power optical-microwave applications.
A narrow-bandwidth interference filter has been developed using volume holography in photorefractive LiNbO3 crystals. The device works as a Bragg reflector hologram recorded, fixed and sample. With 2 mm thick plate the following performances have achieved: peak reflectivity above 32%, full-width at half-maximum bandwidth below 0.05 nm, an angular field of view about 3 degrees wavelength 518.45 nm (for green Ar laser writing wavelength). These compare well with that exhibited by conventional...
We present the deformation pathway of critically charged glycol and water droplets from onset Rayleigh instability compare it to numerical results, obtained for perfectly conducting inviscid droplets. In this simple model presented here, time evolution droplet shape is given by velocity potential equation. The Laplace equation solved expanding onto harmonic functions. For part dominated electrostatic pressure, calculations reproduce experimental data nicely, both, microdroplets. find that in...
The research field of metasurfaces has attracted considerable attention in recent years due to its high potential achieve flat, ultrathin optical devices performance. Metasurfaces, consisting artificial patterns subwavelength dimensions, often require fabrication techniques with aspect ratios (HARs). Bosch and Cryogenic methods are the best etching candidates industrial relevance towards these nanostructures. In this paper, we present Silicon (Si) metalenses by UV-Nanoimprint Lithography...
A 9-/spl mu/m cutoff 256/spl times/256 hand-held quantum well infrared photodetector (QWIP) camera has been demonstrated. Excellent imagery, with a noise equivalent differential temperature (NE/spl Delta/T) of 26 mK achieved. In this paper, we discuss the development very sensitive long wavelength (LWIR) based on GaAs/AlGaAs QWIP focal plane array and its performance in efficiency, NE/spl Delta/T, minimum resolvable (MRTD), uniformity, operability.
A 9-/spl mu/m cutoff 640/spl times/486 snap-shot quantum well infrared photodetector (QWIP) camera has been demonstrated. The performance of this QWIP is reported including indoor and outdoor imaging. noise equivalent differential temperature (NE/spl Delta/T) 36 mK achieved at 300 K background with f/2 optics. This in good agreement expected focal plane array sensitivity due to the practical limitations on charge handling capacity multiplexer, read noise, bias voltage, operating temperature.
We report here the fabrication and demonstration of photomixers made from In0.53Ga0.47As epitaxial material lattice-matched to InP. The consists layers ErAs nanoparticles separated by InGaAs compensated with Be reduce photocarrier lifetime picosecond levels increase resistivity ∼100 Ω cm. Interdigitated-electrode planar-antenna structures were fabricated e-beam lithography tested for dc electrical characteristics, 1.55-μm optical responsivity, difference-frequency photomixing. measured...
In this paper, we discuss the development of very sensitive, long wavelength infrared GaAs/Al/sub x/Ga/sub 1-x/As quantum well photodetectors (QWIPs) based on bound-to-quasi-bound intersubband transition, fabrication random reflectors for efficient light coupling, and demonstration a 15-/spl mu/m cutoff 128/spl times/128 focal plane array imaging camera. Excellent imagery, with noise equivalent differential temperature (NE/spl Delta/T) 30 mK has been achieved.
Parity nonconservation has been studied in elastic $p\ensuremath{\alpha}$ scattering at 46 MeV with longitudinally polarized protons. The longitudinal analyzing power averaged over the range of laboratory angles roughly 30\ifmmode^\circ\else\textdegree\fi{} to 60\ifmmode^\circ\else\textdegree\fi{} is found be ${A}_{z}=(\ensuremath{-}3.3\ifmmode\pm\else\textpm\fi{}0.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$. This result and measurements other light nuclear systems are used...
The "sonic region" of the Sun corona remains extremely difficult to observe with spatial resolution and sensitivity sufficient understand fine scale phenomena that govern quiescent solar corona, as well lead coronal mass ejections (CMEs), which influence space weather. Improvement on this front requires eclipse-like conditions over long observation times. space-borne coronagraphs flown so far provided a continuous coverage external parts but their over-occulting system did not permit analyse...
Continuous-wave distributed feedback interband cascade lasers operating near 3.3 μm are reported. Single longitudinal mode emission is achieved with side suppression ratio greater than 30 dB at temperatures up to 175 K. A clear Bragg stop band in the laser spectrum indicates a dominant index coupling first-order grating. Detailed characteristics of these discussed.