| Space Charge Free Photodiodes |
03 Feb 2012 |
5 pages |
| Authors:
G W Wicks; ROCHESTER UNIV NY
|
 | A new type of infrared detector is designed and experimentally demonstrated, which uses unipolar barriers in the detector's epitaxial structure to block dark currents, while passing photocurrent. Varieties of these new detectors include nBn detectors and unipolar barrier photodiodes. In comparison to conventional photodiodes, dark current suppression by at least six orders of magnitude is demonstrated in both nBn and unipolar barrier photodiodes. The concepts are demonstrated in lnAs-based materials, ... |
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| Short Range 10 Gb/s THz Communications. Proof of Concept Phase 2 |
Dec 2011 |
36 pages |
| Authors:
Alwyn J Seeds; Martyn Fice; Efthymios Rouvalis; Robert Steed; Lalitha Ponnampalam; Chin-Pang Liu; Cyril Renaud; UNIVERSITY COLL LONDON (UNITED KINGDOM) DEPT OF ELECTRONIC AND ELECTRICAL ENGINEERING
|
| This report results from a contract tasking University College London as follows: Short-Range THz Communications Proof of Concept Phase 2. This project has investigated the potential of photonic techniques for generating and coherently detecting millimetre and THz waves, with shortrange (in-room) Gb/s communications systems that operate in unlicensed spectrum above 300 GHz as the target application. This would allow compact, low-cost transceivers to be fabricated that leverage the mature InP-based ... |
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| Calculation of Vertical and Horizontal Mobilities in InAs/GaSb Superlattices (Postprint) |
13 Oct 2011 |
16 pages |
| Authors:
F Szmulowicz; H J Haugan; S Elhamri; G J Brown; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Superlattice (SL) devices such as infrared detectors and quantum-cascade lasers rely on efficient transport of carriers perpendicular to the SL layers by drift and/or diffusion. While horizontal mobilities are measured routinely, measurements of perpendicular-carrier mobilities require nonstandard experimental techniques such as the geometric magneto-resistance. Here we show how perpendicular mobilities can be estimated from horizontal mobility measurements and calculated mobilities. We treat low-temperature horizontal and vertical transport in SL on ... |
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| Development of an Indium Gallium Arsenide (InGaAs) Short Wave Infrared (SWIR) Line Scan Imaging System |
Sep 2011 |
50 pages |
| Authors:
David Y Chiu; Troy Alexander; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This report describes the design, operation, and performance of a line scan imaging system using a one-dimensional (1-D) 256 indium gallium arsenide (InGaAs) photodiode linear array sensor that operates in the short wave infrared (SWIR) (0.8 1.7um) region. The system provides temporal profile images that show the outline, shape, size, height, and grey-shades of moving objects at a distance. These profile images allow low bandwidth and low power operation for ... |
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| Comparison of Photodiode Nonlinearity Measurement Systems |
20 JUN 2011 |
12 pages |
| Authors:
Meredith N. Draa; Alexander S. Hastings; Keith J. Williams; GLOBAL DEFENSE TECHNOLOGY AND SYSTEMS INC CROFTON MD
|
| Photodiode nonlinearity measurements using one-, two- and three-tone measurement systems are compared with each other, to investigate the comparison accuracy between setups. The mathematical relationship between each setup is analyzed, and data on multiple devices are compared to find under which conditions the measurements are comparable. It is shown that the three measurement systems can be used interchangeably only when the distortion adheres to the expected mathematical slopes. |
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| Limits to Maximum Absorption Length in Waveguide Photodiodes |
13 Apr 2011 |
12 pages |
| Authors:
Shannon M Madison; Jonathan Klamkin; Douglas C Oakley; Antonio Napoleone; Jason J Plant; Paul W Juodawlkis; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| The maximum photocurrent, power dissipation, and Iinearity of waveguide photodiodes are limited by the length over which the input optical power is absorbed. This absorption length is determined by the absorption coefficient of the absorbing layer material (a0), the optical confinement factor (r), and the excess optical loss (ai). In this work, we analyze the fundamental limits to maximizing the absorption length and demonstrate a new waveguide photodiode structure that ... |
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| Extended Infrared Photoresponse and Gain in Chalcogen-Supersaturated Silicon Photodiodes |
Jan 2011 |
7 pages |
| Authors:
Aurore J Said; Daniel Recht; Joseph T Sullivan; Jeffrey M Warrender; Tonio Buonassisi; Peter D Persans; Michael J Aziz; RENSSELAER POLYTECHNIC INST TROY NY DEPT OF PHYSICS APPLIED PHYSICS AND ASTRONOMY
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| Highly supersaturated solid solutions of selenium or sulfur in silicon were formed by ion implantation followed by nanosecond pulsed laser melting. pn+ photodiodes fabricated from these materials exhibit gain (external quantum efficiency, EQE, 3000%) at 12 V of reverse bias, and substantial optoelectronic response to light of wavelengths as long as 1250 nm. The amount of gain and the strength of the extended response both decrease with decreasing magnitude ... |
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| Carbon Nanotube Array for Infrared Detection |
05-Dec-2008 |
17 pages |
| Authors:
Jimmy Xu; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
|
| We explore the basic science issues and device potential of our carbon nanotube-silicon (CNT-Si) heterojunctions for infrared photodetection. We focus on the underlying mechanism of infrared photocurrent response, which is elucidated by a detailed study of the dependence of the photocurrent on modulation frequency and intensity of the incident infrared radiation. The photocurrent generation is ascribed to the formation of the CNT-Si heterojunction, rather than the thermal gradient in the ... |
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| Short-Wavelength Countermeasures for Circadian Desynchrony |
30-Jun-2008 |
6 pages |
| Authors:
H C Heller; Mark Smith; STANFORD UNIV CA DEPT OF BIOLOGY
|
| Exposure to light at critical phases of the circadian cycle entrains circadian rhythms. Exposure of humans to bright light for an hour or more at the right phase of the circadian cycle produces significant phase shifts of circadian rhythms speeding recovery from jet-lag, and optimizing cognitive functionality and restorative sleep. Our work on mice produced the unexpected result that exposure to intermittent millisecond flashes of light distributed over an hour ... |
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| A Barrel Straightness Measurement System for Medium Caliber |
SEP 2007 |
18 pages |
| Authors:
Mark Bundy; Jim Garner; Mark L. Kregel; Mark D. Kregel; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Gun barrel straightness is a critical manufacturing requirement for all calibers. Precision laser-based photo diode systems have been developed and perfected for quick and accurate centerline straightness measurement of large caliber smooth bore barrels. However, an equivalent system for medium caliber does not exist. A reduced caliber not only means smaller mechanical and electrical components, but also that barrel rifling will be present. This presents an added challenge to the ... |
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| Remote Measurement of High Temperatures in the Presence of a Strong Magnetic Field |
07 MAY 2007 |
50 pages |
| Authors:
Scott F. Lord; NAVAL ACADEMY ANNAPOLIS MD
|
| The environment inside a railgun makes conventional temperature sensing techniques ineffective. Large time-varying magnetic fields induce noise into sensors with electrical connections. The high rate of change of temperature requires a fast thermal response and a fast sampling rate. Finally, the intense heat generated requires a sensor that is thermally stable over a large range of temperatures. To overcome such environmental challenges, this project utilized an interferometric technique where the ... |
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| InP Based Avalanche Photodiode Arrays for Mid Infrared Applications |
05 APR 2007 |
7 pages |
| Authors:
Jr Holmes Archie L.; TEXAS UNIV AT AUSTIN
|
| This program will develop avalanche photodiodes (APDs) and APD arrays for applications in the MIR. Results to date include photodiodes operating at 2.5 microns, theoretical designs for absorption regions out to 5 microns, and initial results on strain-compensated absorption regions. |
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| Photonic Modulation Using Bi-Directional Diamond Shaped Ring Lasers at 1550 NM |
APR 2007 |
60 pages |
| Authors:
Rebecca Bussjager; Reinhard Erdmann; Vasilios Kovanis; Brian McKeon; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
|
| The Air Force Research Laboratory/Sensors Directorate (AFRL/SNDP) Binoptics Corp, and Infotonics Technology Center worked collaboratively to characterize and eventually package diode-based, diamond-shaped cavity, ring lasers that operate at 1550 nm. The laser modes propagate bi-directionally; however, uniaxial propagation was induced by optical injection from a tunable diode laser. The four-port laser ring offers use as an indirect modulator, directional router, and optical logic devices. Each optical output retains the encoding ... |
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| A Quantitative Electrochemiluminescence Assay for Clostridium perfringens alpha toxin |
10 AUG 2006 |
8 pages |
| Authors:
Gerald A. Merrill; Victor R. Rivera; Dwayne D. Neal; Charles Young; Mark A. Poli; BROOKE ARMY MEDICAL CENTER FORT SAM HOUSTON TX
|
| Described is a rapid direct sandwich format electrochemiluminescence assay for identifying and assaying Clostridium perfringens alpha toxin. Biotinylated antibodies to C. perfringens alpha toxin bound to streptavidin paramagnetic beads specifically immunoadsorbed soluble sample alpha toxin which subsequently selectively immunoadsorbed ruthenium (Ru)-labeled detection antibodies. The ruthenium chelate of detection antibodies chemically reacted in the presence of tripropylamine and upon electronic stimulation emitted photons (electrochemiluminescence) that were detected by the photodiode of ... |
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| Low Noise Simultaneous Fluorescence Detection of Two Atomic States (PREPRINT) |
05 APR 2006 |
5 pages |
| Authors:
M. T. Cashen; J. B. Fixler; G. W. Biedermann; M. A. Kasevich; STANFORD UNIV CA DEPT OF PHYSICS
|
| We have demonstrated a new technique for fluorescence detection of ultracold atoms. Fluorescence from two spatially separated clouds of ultracold atoms illuminated by a mutual probe laser was imaged onto opposite quadrants of a position-sensitive detector. The populations in the two separated atomic clouds were measured by integrating the quadrant detector photocurrents. Simultaneous detection of the populations of the two atomic clouds was used to reduce noise caused by fluctuations ... |
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| Development of High Performance Electronics and Optical-to-Electrical Advanced Circuitry for Photonic Analog-to-Digital Converters |
FEB 2006 |
27 pages |
| Authors:
MAYO FOUNDATION ROCHESTER MN
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| Deployment Repeatability of a Truss Structure Utilizing Integral Composite Hinges |
16 SEP 2005 |
11 pages |
| Authors:
Nicolas W. Frank; Hans-Peter Dumm; AIR FORCE RESEARCH LAB KIRTLAND AFB NMSPACE VEHICLES DIRECTORATE
|
| An overview of a deployable truss structure utilizing doubly slit cylindrical shells as integral composite hinges is presented along with a measurement system and results of deployment repeatability. The measurement system was developed and built as part of a project in the Space Scholars Program at the Air Force Research Laboratory at Kirtland AFB. Previous deployment repeatability tests of integral hinges at the University of Colorado focused on single members ... |
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| Standoff Polarimetric Aerosol Detection (SPADE) for Biodefense |
01 FEB 2005 |
|
| Authors:
J. W. Snow; W. E. Bicknell; A. T. George; H. K. Burke; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
 | The polarization of laser light elastically scattered by small particles is investigated for the purpose of remotely detecting bio-aerosol presence in typical ambient background aerosols. The information source is small-particle scattering code computations, not actual measurements. Two separate types of particles - natural background aerosols vs. bio-aerosols - are combined with a concentration ratio of 100-to-1. The objective is to assess the feasibility of detecting the introduction of the bio-aerosol ... |
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| Microdischarge Devices and Arrays |
JAN 2005 |
24 pages |
| Authors:
J. G. Eden; ILLINOIS UNIV CHAMPAIGN GRANTS AND CONTRACTS ADMINISTRATION
|
| During this grant, several major advances have been made in the technology of this new family of photonic devices. Highlights include: 1. The discovery that microdischarge devices with Si pyramid cathodes are extraordinarily sensitive photo detectors in the near-IR and visible. This new hybrid semiconductor/plasma device was found to have a photoresponsivity at least an order of magnitude greater than that of commercially-available avalanche photodiodes and two orders of magnitude ... |
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| Optical Tomography of the ZaP Flow Z-Pinch Plasma |
2005 |
154 pages |
| Authors:
Adam M. Madson; WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| The ZaP Flow Z-Pinch Experiment forms a Z-pinch with an embedded axial flow that exhibits stability for 500 - 2000 times the instabililty growth time for a static Z-pinch. Two linear photodiode arrays placed orthogonal to each other measure chord-integrated emissivity of the plasma. Deconvolving these data produce time resolved 1-D and 2-D emission profiles of the Z-pinch cross-section during the stable quiescent period. These unfiltered emission profiles show that ... |
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| Receiver Performance Characterization for Modulating Retro-Reflector Atmospheric Optical Links With Pulsed Lasers and Optical Pre-Amplifiers |
2005 |
12 pages |
| Authors:
F. M. Davidson; P. Nigon; G. C. Gilbreath; W. S. Rabinovich; JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Receiver performance is calculated for two types of free-space atmospheric optical communications systems - a direct detection system using a p-i-n photodiode preceded by an optical amplifier, and an ideal coherent receiver operated in its shot-noise limited regime without an optical pre-amplifier. The signal format for both is amplitude shift keying "onoff modulation" with an assumed rectangular light pulse of duration T seconds. The more accurate Beckman probability density function ... |
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| Development of High-Operating-Temperature Mercury Cadmium Telluride Infrared Detectors at DRS |
DEC 2004 |
3 pages |
| Authors:
H. D. Shih; M. A. Kinch; F. Aqariden; P. K. Liao; H. F. Schaake; DRS INFRARED TECHNOLOGIES LP DALLAS TX
|
| An overview on DRS' approach towards realization of HgCdTe photonic infrared detectors based on DRS's proven HDVIP(registered) technology is given A summary of recent progress is described. |
|
| Photonic Analog-to-Digital Conversion Technology |
DEC 2004 |
106 pages |
| Authors:
W. Ng; L. Lu; D. Yap; W. Bridges; M. Mokhtari; HRL LABS LLC MALIBU CA
|
| This report documents the work undertaken by HRL Laboratories, LLC and its subcontractors, California Institute of Technology and Raytheon Electronics Systems, on the development of multi-GHz photonic analog-to-digital (A/D) conversion technologies (PACT). Using an electro-optic modulator, the analog-input to the A/D converter was impressed (i.e. photonically sampled) on a train of low-jitter picosecond pulses (wavelength - 1540 rim) generated by a mode-locked Er-fiber laser. After photodetection, the electrical outputs of ... |
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| A Low-Cost, Man-Portable, Free-Space Optics Communications Device for Ethernet Applications |
DEC 2004 |
70 pages |
| Authors:
Janaka P. Perera; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis sought to design and implement a low-cost, portable, Free-Space Optics (FSO) communications device for Ethernet applications. Under some circumstances such a device would have utility at a Combat Operations Center (COC), a Field Artillery Position, or wherever else fiber optic cable is used in garrison or field. The design was based on commercial off the shelf components originally designed for fiber optic applications. Based on a 155 megabits ... |
|
| Physics and Simulation of Optoelectronic Devices XII |
JAN 2004 |
487 pages |
| Authors:
Marek Osinski; Hiroshi Amano; Fritz Henneberger; SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS BELLINGHAM WA
|
| Papers on Novel Nanostructures and Optoelectronic Devices, Physics of Quantum Dot Lasers, Simulation of Fiber Devices and Optical Waveguides, Optical Communications, Diode Laser Simulation, VCSels and Resonant-Cavity Photodiodes, Physics of Low Dimensional Structures and Devices, Chaos Synchronization in Diode Lasers, Diode Lasers with Optical Feedback and Wide Bandgap/Visible Materials and Devices. |
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| A 10-Bit 10 GSPS Optical ADC for Radar Signal Processing |
NOV 2003 |
18 pages |
| Authors:
Eric Donkor; CONNECTICUT UNIV STORRS OFFICE FOR SPONSORED PROGRAMS
|
| Next generation radar systems for tactical aircraft will need to improve aircraft survivability, allow for cooperative multistatic mode of operation, provide efficient anti-jamming features, and compensate for motion- induced clutter. Faster digital processors are required, in particular analog- to-digital converters (ADCs) for digital processing of X-band radar systems. This effort investigated and demonstrated an optoelectronic scheme for a high- speed optical ADC. The system was designed with the following objectives ... |
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| Solid State Research |
11 APR 2003 |
|
| Authors:
David C. Shaver; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 August-31 October 2002 The topics covered are Quantum Electronics, Electro-optical Materials and Devices, Submicrometer Technology, Biosensor and Molecular Technologies, Advanced Imaging Technology, Analog Device Technology, and Advanced Silicon Technology Funding is provided by several DoD organizations- including the Air Force, Army, DARPA, MDA, Navy, NSA, and OSD-and also by the ... |
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| VCSEL and Smart Pixel Research for VLSI Photonics |
25 FEB 2003 |
14 pages |
| Authors:
K. Y. Cheng; R. D. Dupuis; M. Feng; S. R. Forrest; N. Holonyak Jr; ILLINOIS UNIV AT URBANA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The goal of this research program is to develop smart pixels and related technology for VLSI photonic systems. The native oxide and tunneling contact technology developed at the University of Illinois is the enabling technology for high performance vertical cavity surface emitting lasers (VCSELs) which will be used in future photonic systems and specifically in the smart pixels that are the focus of this research program. The smart pixel 8 ... |
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| Solid State Research |
15 FEB 2003 |
|
| Authors:
David C. Shaver; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 November 2002 through 31 January 2003. The topics covered are Quantum Electronics, Electro-optical Materials and Devices, Submicrometer Technology, Biosensor and Molecular Technologies, Advanced Imaging Technology, Analog Device Technology, and Advanced Silicon Technology. Funding is provided by several DoD organizations- including the Air Force, Army, DARPA, MDA, Navy, NSA, and OSD-and ... |
|
| Solid State Research, 2002:3 |
29 JAN 2003 |
|
| Authors:
David C. Shaver; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 May-31 July 2002. The topics covered are Quantum Electronics, Electro-optical Materials and Devices, Submicrometer Technology, Biosensor and Molecular Technologies, Advanced Imaging Technology, Analog Device Technology, and Advanced Silicon Technology. Funding is provided by several DoD organizations- including the Mr Force, Army, DARPA, MDA, Navy, NSA, and OSD-and also by the ... |
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| Uncooled Photon Detectors for IR Imaging |
DEC 2002 |
61 pages |
| Authors:
M. Razeghi; H. Mohseni; Y. Wei; A. Gin; J. Bae; NORTHWESTERN UNIV EVANSTON IL CENTER FOR QUANTUM DEVICES
|
| Throughout the comprehensive research in the past three years, the unique properties of Type II InAs/GaSb heterojunctions were utilized for the realization of novel uncooled infrared photodetectors with higher operating temperature, detectivity and uniformity than the commonly available infrared detectors. |
|
| Exploration of New Technologies and Novel Designs to Improve X-ray Framing Camera Performance |
01 NOV 2002 |
5 pages |
| Authors:
R. P. Drake; MICHIGAN UNIV ANN ARBOR DEPT OF ATMOSPHERIC OCEAN AND SPACE SCIENCES
|
| We have developed and activated a facility for steady-state x-ray characterization of microchannel plates, framing cameras, and related components. We have completed a vacuum system with a Manson-type x-ray source. This required experience with and upgrading of the source in order to make it routinely operable. At this time we are able to operate it routinely and we have written manuals for its operation and maintenance by students working in ... |
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| Micromachined Fabry-Perot Interferometer for Motion Detection |
10 SEP 2002 |
4 pages |
| Authors:
Richard L. Waters; Monti E. Aklufi; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| The monolithic integration of a Fabry-Perot interferometer and a (100) silicon photodiode is reported for use as a highly sensitive transduction method in the detection of minute displacements of a proof mass attached to a spring. The combination results in a compact device with active transistor-like amplification and minimal parasitic elements, The transducer is fabricated using standard surface micromachining techniques. The finesse of the optical cavity, incident optical power, and ... |
|
| Demonstration of a Low Cost, High-Speed Fiber Optic Transceiver |
SEP 2002 |
161 pages |
| Authors:
Terri L. Dooley; Grant R. Emmel; Gert K. Hohenwarter; Michael P. Nesnidal; Robert A. Marsland; FOCUSED RESEARCH INC MIDDLETON WI
|
| A high-speed serial optical link suitable for a range of commercial and military short-haul applications, operating over a distance of up to 300 meters was developed. At the heart of the link lie a vertical-cavity surface- emitting laser (VCSEL) diode transmit and a gallium arsenide (GaAs) photo detector, driven and amplified by custom-designed GaAs integrated circuits. The transmit or receiver is individually hermetically sealed in a metal-ceramic surface-mounted package with ... |
|
| Development of High-Sensitivity Nitride Solar-Blind Detectors and Detector Arrays Using Low-Dislocation-Density Nitride Surfaces |
MAR 2002 |
62 pages |
| Authors:
J. F. Schetzina; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| This work explored the application of III-V nitride semiconductors for optical detectors in the ultraviolet (UV) region of the electromagnetic spectrum. Metalorganic vapor phase epitaxy was used to synthesize thin film p-i- n photodiode structures on double side polished sapphire substrates. These structures were fabricated into photodiode devices using generally accepted techniques for dry etching and p and n-contact metallizations. Test devices were characterized which demonstrated quantum efficiencies as high ... |
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| Epitaxial Ternary and Quaternary III-V Antimonide Substrates |
2002 |
10 pages |
| Authors:
Michael G. Mauk; Jeffrey A. Cox; Oleg V. Sulima; Sarbajit Datta; Anthony N. Tata; ASTROPOWER INC NEWARK DE
|
| Modified liquid-phase epitaxy (LPE) techniques can be adapted for the growth of relatively thick (50 to 500 micron) epitaxial layers of ternary and quaternary II I-V antimonide alloys, including InAsSb, InGaSb, AlGaAsSb, InGaAsSb, and InAsSbP. These structures can function as virtual' substrates with adjustable lattice constants for epitaxy of various optoelectronic devices such as mid-infrared photodiodes. A variety of substrate structures can be realized either by effecting gradual, continuous compositional ... |
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| Investigation of III-Nitride Alloys for Ultraviolet Photodetectors and Blue-Green Lasers |
AUG 2001 |
29 pages |
| Authors:
NORTHWESTERN UNIV EVANSTON IL CENTER FOR QUANTUM DEVICES
|
| This AASERT contract was intended to support one graduate and one undergraduate students for three years, with the objective of conducting research work on the growth and characterization of wide bandgap GaN based semiconductors for ultraviolet photodetectors and visible light emitters. The research was directed toward optimizing the metalorganic chemical vapor deposition (MOCVD) growth and characterization of undoped, n-type and p-type doped wide bandgap GaN and AlxGa1-xN semiconductors, for x ... |
|
| Chalcogenide Fibre Displacement Sensor |
JUN 2001 |
4 pages |
| Authors:
S. Miclos; T. Zisu; NATIONAL INST OF RESEARCH AND DEVELOPMENT FOR OPTOELECTRONICS BUCHAREST (ROMANIA)
|
| Fibre optic technology offers the possibility for developing of a variety of physical sensors for a wide range of physical parameters. The main advantage of fiber optic sensors lies in their dielectric construction, providing electrical isolation, immunity from electromagnetic fields, small dimensions, and compatibility with optical fibre technology. A large number of fiber sensors in production are based on intensity modulation of the light either outside the fiber or within ... |
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| Flip-Chip Bonding Equipment for UV Focal Plane Array Development Based on GaN/AlGaN p-i-n Photodiodes |
16 APR 2001 |
8 pages |
| Authors:
Jan Schetzina; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF PHYSICS
|
| This instrumentation proposal is for flip-chip bonding equipment that is essential for bonding the large-format arrays that have been proposed to Si readout integrated circuits (ROICs). At present, no flip-chip bonding equipment is currently available at NCSU, and the flip-chip bonder at NVL is limited in its bonding force such that only diode arrays of up to 64 x 64 pixels can be bonded using indium bump bonds. The proposed ... |
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| Nanoscale Field Localization for Manipulation and Probing of Computationally Interesting Biomolecules |
APR 2001 |
5 pages |
| Authors:
D. W. Weide; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Several new and important results were enabled by this grant, which was to build a bioelectronic interface to single protein molecules. This interface consists of both environmental and mechanical supports for a membrane protein. While supported membranes are being studied in many laboratories, single channel probing has been performed almost exclusively with voltage-clamp techniques, by using fragile glass pipettes, or with cumbersome planar bilayer equipment unsuitable for field deployment. Single ... |
|
| SiGeC Optoelectronic Devices |
24 JAN 2001 |
12 pages |
| Authors:
James Kolodzey; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The spectral responses of a series of heterojunction diodes of p-type Ge(1-y)C(y) On n-type Si (100) substrates were measured by Fourier transform infrared spectroscopy. Alloy layers 0.5 micrometers thick were grown by molecular beam epitaxy at a substrate temperature of 400 C and were doped p-type with different B concentrations. With increasing C content, the diode dark current decreased, and the optical absorption band edge shifted toward higher energy by ... |
|
| Low-Noise WideBand Heterodyne Optical Array Receiver |
10 OCT 2000 |
19 pages |
| Authors:
Vinson L. Go; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system and method is disclosed for detecting optical signals that is especially suitable for use with a fiber optic sonar transducer array. The system preferably uses two photodiodes with a frequency response matched to within one percent over a bandwidth of at least one Gigahertz to reduce common mode intensity noise. Preferably the two photodiodes are manufactured on the same semiconductor wafer to provide as closely identical properties as ... |
|
| Nanoscale Field Localization for Manipulation and Probing of Computationally Interesting Biomolecules |
AUG 2000 |
5 pages |
| Authors:
D. W. van der Weide; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Several new and important results were enabled by this grant, which was to build a bioelectronic interface to single protein molecules. This interface consists of both environmental and mechanical supports for a membrane protein. While supported membranes are being studied in many laboratories, single channel probing has been performed almost exclusively with voltage-clamp techniques, by using fragile glass pipettes, or with cumbersome planar bilayer equipment unsuitable for field deployment. Single ... |
|
| Optical Computed Tomography for Imaging the Breast: First Look |
JUL 2000 |
7 pages |
| Authors:
Richard J. Grable; Steven L. Ponder; Nikolaos A. Gkanatsios; William Dieckmann; Patrick Olivier; IMAGING DIAGNOSTIC SYSTEMS INC PLANTATION FL
|
| The purpose of the study is to compare computed tomography optical imaging with traditional breast imaging techniques. Images produced by a computed tomography laser mammography (CTLM to the TM) scanner are compared with images obtained from mammography, and in some cases ultrasound and/or magnetic resonance imaging (MRI). During the CTLM procedure, a near infrared laser irradiates the breast and an array of photodiodes detectors records light scattered through the breast ... |
|
| Calibration to Determine Pressure and Temperature Sensitivities of a Pressure-Sensitive Paint |
JUN 2000 |
88 pages |
| Authors:
Judith A. Muller; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In order to obtain quantitative surface pressure measurements of a transonic compressor rotor using pressure sensitive paint (PSP), the temperature dependence of the paint must be taken into consideration. In the present study, a calibration chamber was built and instrumented such that pressure and temperature could be controlled independently. Photodiodes were used to measure the intensity of light emitted by the PSP. An acquisition program was ... |
|
| AASERT97 Student Support for Observations Relevant to Sprites and Jets |
MAY 2000 |
5 pages |
| Authors:
William H. Beasley; OKLAHOMA UNIV NORMAN
|
| During the Summer and Fall of 1998 five balloon-borne instruments were launched into thunderstorms to observe changes in the vertical component of electric field caused by lightning. Data from two flights have been compared with data from the National Lightning Detection Network (NLDN) for cloud-to ground lightning flashes that were coincident in time. The field changes observed at altitude appear to have been caused by charge movements relatively nearer the ... |
|
| Solid State Research |
15 FEB 2000 |
|
| Authors:
David C. Shaver; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 November 1999-31 January 2000. The topics covered are Quantum Electronics, Electro-optical Materials and Devices, Submicrometer Technology, Biosensor and Molecular Technologies, Advanced Imaging Technology, Analog Device Technology, and Advanced Silicon Technology. Funding is provided by several DoD organizations-including the Mr Force, Army, BMDO, DARPA, Navy, ... |
|
| Instrumentation and Methodology for the Determination of Hit Point in Missile Defense Flight Tests |
2000 |
|
| Authors:
Robert Becker; Gary Paderewski; Darryl Easterling; James Wilbeck; ARMY SPACE AND MISSILE DEFENSE COMMAND HUNTSVILLE AL
|
| Lethality, the ability to destroy a target's nuclear, chemical, biological, or high explosive payload, can be critically dependent on where a Hit-to-Kill interceptor impacts a target. The Photonic Hit Indicator (PHI) was developed to measure, in situ, hit points that occur in flight-testing. The PHI uses a fine mesh of optical fibers that cover the target's surface. Each fiber is illuminated by a miniature laser ... |
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| Static Tester for Characterization of Optical Near-Field Coupling Phenomena |
2000 |
7 pages |
| Authors:
Ferry Zijp; Yourii V. Martynov; PHILIPS RESEARCH LABS EINDHOVEN (NETHERLANDS)
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| We present an experimental set-up for systematical studies of optical near-field coupling phenomena using a solid immersion lens (SIL) to surpass the conventional far field diffraction limit. The set-up incorporates a microscope objective lens with NA=0.80 in combination with a hemispherical SIL manufactured from glass with refractive index n=1.887 and a laser with a wavelength of 430 nm. Test samples are positioned within the evanescent decay distance from the bottom ... |
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| Application of Control Theory and Design to Atomic Scale Problems |
31 DEC 1999 |
15 pages |
| Authors:
Mohammed Dahleh; CALIFORNIA UNIV SANTA BARBARA DEPT OF MECHANICAL ENGINEERING
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| The research program investigated two aspects of interactions between control theory and atomic scale sensing and modification of materials. One research focus was on a class of nanoscale sensors and actuators that are based on a microcantilever mechanism. The other direction was concerned with laser molecular control. |
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