A5066988657- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Infrared Target Detection Methodologies
- Adaptive optics and wavefront sensing
- Analog and Mixed-Signal Circuit Design
- Medical Imaging Techniques and Applications
- Calibration and Measurement Techniques
- Particle physics theoretical and experimental studies
- Advanced Semiconductor Detectors and Materials
- Semiconductor Lasers and Optical Devices
- Astronomy and Astrophysical Research
- Advancements in Semiconductor Devices and Circuit Design
- Astronomical Observations and Instrumentation
- Photonic and Optical Devices
- Thin-Film Transistor Technologies
- Advancements in PLL and VCO Technologies
- Atomic and Subatomic Physics Research
- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- Advanced X-ray and CT Imaging
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Radiation Effects in Electronics
- Radio Astronomy Observations and Technology
Brookhaven National Laboratory
2015-2025
South Warwickshire NHS Foundation Trust
2021-2022
Lawrence Berkeley National Laboratory
2008-2020
Brookhaven College
2002-2014
University of North Carolina at Charlotte
2013-2014
University of Illinois Urbana-Champaign
2006
Stony Brook University
2006
National Library of Luxembourg
2006
Being Adept
2004
Analog Devices (Ireland)
2002
The lowest loss optical waveguides to date are those of high silica composition prepared by vapor deposition. present article describes a method for producing having GeO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> -SiO core and SiO cladding. These combine low with relatively large index differences between cladding, Large create problems in communication systems because dispersion effects. Means grading so as decrease also described.
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
We have found what we believe to be a universal characteristic of layered superconductors: A positive curvature the ${H}_{c2}$-versus-${T}_{c}$ boundary. The origins effect are believed associated with strong anisotropies Fermi surface and electronphonon interaction.
Relaxation of photoinduced optical absorption following pulsed laser excitation was measured between 0.5 \ensuremath{\mu}s and 10 ms in doped undoped $a$-Si: H as a function temperature. The recombination found to be bimolecular diffusion limited. coefficient the excess carriers is time dependent ($\ensuremath{\sim}{t}^{\ensuremath{-}0.3}$) agreement with drift mobility photocarriers predictions continuous-time random-walk theory dispersive transport disordered materials.
Transient photoinduced optical absorption (PA) was used to study the transport, trapping, and recombination of excess electrons holes in hydrogenated amorphous semiconductors with tetrahedral bonding. The materials studied were $a$-Si:H, $a$-Ge:H, $a$-GaAs:H, binary alloy systems $a\ensuremath{-}{\mathrm{Si}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}$:H $a\ensuremath{-}{\mathrm{Si}}_{y}{\mathrm{C}}_{1\ensuremath{-}y}$:H prepared by sputtering or glow discharge. In energy gaps...
Anesthesia is currently required for positron emission tomography (PET) studies of the animal brain in order to eliminate motion artifacts. However, anesthesia profoundly affects neurological state animal, complicating interpretation PET data. Furthermore, it precludes use study during normal behavior. The rat conscious tomograph (RatCAP) designed need studies. It a miniaturized full-ring scanner that attached directly head, imaging nearly entire brain. RatCAP utilizes arrays 2 mm /spl...
As a result of cooperation between Brookhaven National Laboratory and eV Products generation high performance readout ASICs was developed. The ASICs, realized in CMOS 0.5 /spl mu/m technology, are available several different versions, single or multi-channel with unipolar bipolar shaper, view their use research, spectroscopy, medical, safeguard industrial applications. Four innovative circuit solutions implemented the ASICs: (i) linearity compensated continuous reset system which self-adapts...
The optimization of the input MOSFET for charge amplifiers in deep submicron technologies is discussed. After a review traditional approach, impact properly modeling equivalent series noise and gate capacitance presented. It shown that enhanced model, when compared to classical, produces different resolution estimate result. minimum channel length maximum allocated power are not always best choice terms resolution. Also, an optimized front-end, low frequency contribution Equivalent Noise...
Low-loss optical fibers may be necessary for economical tranamieeion sy.stema. We have developed that exhibit losses of lese than 2 dB/km. at 1.06 µm. The were made by a chemical vapor deposition (CVD) technique employs simultaneous reaction and fwdon to clear glassy core material.
As a result of cooperation between Brookhaven National Laboratory and eV Products generation high performance readout ASICs was developed. One the novel circuit solutions implemented in is baseline holder (BLH), system which provides setting stabilization output both at low frequency rate operation. The BLH conceptually different from restorer (BLR). With peaking voltage 2 V (10 fC), time 400 ns 500 kHz, an asymptotic shift <8 mV measured periodic case. A resolution higher than 12 bit found...
As a result of cooperation between Brookhaven National Laboratory and eV Products generation high performance readout ASICs was developed. One the novel circuit solutions implemented in is fully compensated continuous reset system capable handling detector leakage currents up to several tens nA with linearity noise contribution always lower than shot detector. The based on use MOSFET operating above threshold saturation. full compensation obtained by using suitable replica MOSFET....
A study of the x‐ray sensitivity amorphous selenium (a‐Se) for digital mammography has been performed. uniform layer a‐Se was deposited on a glass substrate with electrodes both surfaces. The deposition procedure identical to that used flat‐panel detectors. high voltage applied top surface in order establish an electric field Then sample exposed x rays 27 kVp spectra generated from tube molybdenum (Mo) target. mean energy spectrum ∼16.6 keV. current by measured as function From measurement...
The Large Synoptic Survey Telescope (LSST) is a large aperture, wide-field facility designed to provide deep images of half the sky every few nights. There only single instrument on telescope, 9.6 square degree visible-band camera, which mounted close secondary mirror, and points down toward tertiary. requirements of the LSST camera present substantial technical design challenges. To cover entire 0.35 1 μm visible band, camera incorporates an array 189 over-depleted bulk silicon CCDs...