| Ultrafast Integrated Optical Signal Processing |
28 Jan 2010 |
|
| Authors:
Erich P Ippen; Leslie A Kolodziejski; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | We investigated the fabrication and optical characterization of photonic integrated circuit (PIC) designed for telecommunication applications using ultrafast ( 100Gbits/s) optical logic. The basic components in the PIC are active components, such as semiconductor optical amplifiers (SOAs), integrated with passive, light-routing waveguides and beam splitter/combiners. Optical switching is accomplished with SOAs embedded within the arms of Mach-Zehnder interferometers (MZIs), whereas power splitting/combining of propagating signals is carried out within multimode ... |
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| Research Studies on Electromagnetically Induced Transparency |
20 Jan 2010 |
94 pages |
| Authors:
S E Harris; LELAND STANFORD JUNIOR UNIV CA
|
 | The overall theme of this work has been the development and utilization of new sources of radiation that produce time energy entangled biphotons that are both much longer and much shorter than those that now exist. We have learned to produce biphotons with temporal lengths greater than 500 nanoseconds and linewidths smaller than the natural linewidth of target atoms. We have demonstrated the use of telecommunication light modulators to modulate ... |
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| Focused Ion Beam Milling Applied in Future Tunable-Wavelength Nano-LED's Fabrication |
07 Jan 2010 |
8 pages |
| Authors:
Chuan-Pu Liu; NATIONAL CHENG KUNG UNIV TAINAN (TAIWAN)
|
| This is a report on the development of a technique of self-masking lithography for making high aspect-ratio nanopillars by using a volume swelling phenomenon during beam-material interactions. |
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| Performance Analysis of Live-Virtual-Constructive and Distributed Virtual Simulations: Defining Requirements in Terms of Temporal Consistency |
Dec-2009 |
134 pages |
| Authors:
Douglas D Hodson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research extends the knowledge of live-virtual-constructive (LVC) and distributed virtual simulations (DVS) through a detailed analysis and characterization of their underlying computing architecture. LVCs are characterized as a set of asynchronous simulation applications each serving as both producers and consumers of shared state data. In terms of data aging characteristics, LVCs are found to be first-order linear systems. System performance is quantified via two opposing factors; the consistency of ... |
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| Functionalizing Carbon Nanotubes and Related Nanostructures for Various Applications |
14 Nov 2009 |
24 pages |
| Authors:
Li-Chyong Chen; Kuei-Hsien Chen; NATIONAL TAIWAN UNIV TAIPEI
|
| This report deals with highly functionalized devices involving multi-components and heterogeneous interfaces for which nano-scale control is useful. The researcher then describes six different types of devices. |
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| Power MEMS Development |
Nov-2009 |
16 pages |
| Authors:
John Bumgarner; SRI INTERNATIONAL MENLO PARK CA PHYSICAL SCIENCES DIV
|
| SHORT LOOP EXPERIMENTS: During this period we completed one short loop experiment to verify the use of chromium (Cr) as a hard mask for silicon dioxide (SiO2) wet etching. This Cr hard mask was used during the fabrication of the Indent layer in the process flow. For this experiment, we deposited 3-micrometers of SiO2 on the wafer and then sputtered a layer of Cr. We patterned and etched the Cr, ... |
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| Double Negative Materials (DNM), Phenomena and Applications |
Jul 2009 |
|
| Authors:
John Franklin; John Biddle; Bohdan Balko; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
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| In this document we examine recent developments in double negative materials (DNM) or negative index of refraction materials (NIR) and consider their potential military applications. These materials are artificially engineered, composite structures that provide extraordinary responses to electromagnetic (EM) waves in general. These materials are important because they allow us to control light (or EM waves) in ways not previously possible. Because these metamaterials exhibit a unique ability to bend ... |
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| Next Generation Highly Conducting Organic Films Using Novel Donor-Acceptor Molecules for Opto-Electronic Applications |
Jun-2009 |
16 pages |
| Authors:
Eric Forsythe; Jianmin Shi; David Morton; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This two-year DRI is intended to address the Army's need for two-dimensional, conformal, large-area electronics by developing techniques that will lead to the printing of conducting organic materials as a primary build-block that will enable such low-cost, large area applications. In the first year, we worked on developing novel organic based molecules using the donor-acceptor design concepts and developing a more fundamental understanding of donor acceptor molecule stacking in order ... |
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| Erratic Dislocations Within Funnel Defects in AlN Templates for AlGaN Epitaxial Layer Growth |
21 May 2009 |
17 pages |
| Authors:
Michael E Hawkridge; Z Liliental-Weber; H J Kim; S Choi; D Yoo; J -H Ryou; R D Dupuis; CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB
|
| We report our transmission electron microscopy observations of erratic dislocation behavior within funnel-like defects in the top of AlN templates filled with AlGaN from an overlying epitaxial layer. This dislocation behavior is observed in material where phase separation is also observed. Several bare AlN templates were examined to determine the formation mechanism of the funnels. Our results suggest that they are formed prior to epitaxial layer deposition due to the ... |
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| Advanced Visualization and Interactive Displays (AVID) |
Apr-2009 |
60 pages |
| Authors:
Peter A Jedrysik; Jason A Moore; Chad F Salisbury; Brian Holmes; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
|
| This Final Technical Report discusses the Advanced Visualization and Interactive Displays (AVID) program objectives and accomplishments to evaluate, exploit, and develop new concepts in information visualization, display technology, and human-computer interaction (HCI) that provide airmen with a tailored information environment. Building on past in-house programs that researched the technology areas of advanced visualization and interactive displays independently, this program sought to develop integrated technology that would leverage each other's capabilities. ... |
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| Optical Excitations and Energy Transfer in Nanoparticle Waveguides |
Mar-2009 |
16 pages |
| Authors:
A L Burin; TULANE UNIV NEW ORLEANS LA
|
| The main objective of the present proposal was the comprehensive investigation of the high-quality optical modes bound to one-dimensional arrays of dielectric particles. Three particular goals were completed during the three years of the project: 1) Investigated the formation of high quality optical modes in linear chains of nanoparticles fabricated from different optical materials optical processing a relatively high refraction index. Found that when the refractive index exceeds 2 bound ... |
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| Identification of Text and Symbols on a Liquid Crystal Display Part I: Characterisation of the Luminance, Temporal and Spectral Characteristics |
Feb-2009 |
|
| Authors:
Kingsley Fletcher; Stuart Sutherland; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| This report outlines the measurements performed on an Apple M9179LL/A 30' 2560 x 1600 LCD panel to establish its luminance response function, luminance uniformity, luminance temporal stability, response time and spectral characteristics. The results of this report were used in subsequent reports (Fletcher, Sutherland, & Nugent, in press; Fletcher, Sutherland, Nugent, & Grech, in press) which examined the minimum character size that allowed for fast and accurate identification of numbers, ... |
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| Identification of Text and Symbols on a Liquid Crystal Display Part III: The Effect of Ambient Light, Colour and Size |
Feb-2009 |
|
| Authors:
Kingsley Fletcher; Stuart Sutherland; Karen Nugent; Michelle Grech; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| This study aimed to identify the minimum font size that supports fast and accurate identification of text and symbols displayed on an LCD under ambient lighting conditions similar to those in naval ships' operations rooms. A series of letters, numbers and combat symbols were displayed on an LCD for either 106 ms or 173 ms. Participants were asked to identify each stimulus and the certainty of their decision. Letters and ... |
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| Embedded Meta-Material Antennas |
31-Jan-2009 |
21 pages |
| Authors:
Dennis W Prather; DELAWARE UNIV NEWARK
|
| With the dawn of the Digital Battlefield, a critical capability in the modern warfare environment is the miniaturization of electronic warfare signal and information processing systems. To realize such systems, the key is to miniaturize antennas that transmit and receive signals. In particular, by introducing reconfigurable antennas, one can combine multiple antennas operating at various frequency bands into a single aperture, which can provide significant miniaturization and flexibility to the ... |
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| Tunable, Room Temperature Light-emitting Diodes Based on Strained Si/SiGe Heterostructures |
24-Jan-2009 |
5 pages |
| Authors:
G Sun; H H Cheng; R A Soref; NATIONAL TAIWAN UNIV TAIPEI CENTER FOR CONDENSED MATTER SCIENCES
|
| This is the report of a project to engineer SiGe/Si heterostructures for a type-I band alignment in which the emission intensity at around 1 micrometer is enhanced over conventional Si-based diodes, and to develop sight-emitting diodes based on the novel type-I SiGe/Si heterostructure. |
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| Single-Molecule Luminescence and High Efficiency Photovoltaic Cells Based on Percolated Conducting Carbon Nanotubes Scaffolds Templated with Light-Harvesting Conjugated Polymers and Nanohybrids |
14-Jan-2009 |
63 pages |
| Authors:
Arnold C Yang; NATIONAL TSING HUA UNIV HSINCHU (TAIWAN) DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| This project describes the successful preparation of the novel photoelectric material poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene)-grafted multiwall carbon nanotubes(MWCNTs) and some of this material's photoelectric properties. Nanocomposites constructed by surface-grafted multiwall carbon nanotubes (CNTs) with conjugated polymers dispersed in a polymer matrix were synthesized to form novel optoelectronic materials that exploit single-molecule effects. During the course of the execution of the proposal, research work was focused on three parts: 1. the synthesis work ... |
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| III-nitride and Related Wuertzite Quantum-dot-based Optoelectronic Devices with Enhanced Performance |
Jan-2009 |
7 pages |
| Authors:
Michael A Stroscio; Mitra Dutta; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The investigators have undertaken several efforts underlying the enhancement of the performance of Ill-nitride and related wuertzite quantum-dot-based optoelectronic devices. These include: carrier scattering by optical phonons; spontaneous polarization in wuertzite; the use of colloidal quantum dots as optoelectronic elements; strain- and confinement-induced shifts in the phonon frequencies in GaN quantum dots; two-phonon processes in photon absorption; phonon effects on carrier transport in nanowires, including wurtzite-based nanowires; and the design ... |
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| Pilot Preferences on Vector Moving-Map Displays |
Jan-2009 |
22 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; Stephanie A Myrick; John W Ruffner; Tyrus Cohan; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Vector map databases offer the potential for customised cockpit moving-map displays, in which user-specified cartographic features can be layered to meet mission requirements. The disadvantage of vector moving-maps is the potential for increased user workload. In 1995, the Naval Research Laboratory and the Naval Air Weapons Center jointly performed a preference study, during which aircrew viewed demonstrations of prototype moving-map displays and responded to a detailed questionnaire concerning the usefulness ... |
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| Synthesis and Photovoltaic Application of Coper (I) Sulfide Nanocrystals |
22 Dec 2008 |
19 pages |
| Authors:
Yue Wu; Cyrus Wadia; Wanli Ma; Bryce Sadtler; A P Alivisatos; CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB
|
| We present the rational synthesis of colloidal copper(I) sulfide nanocrystals and demonstrate their application as an active light absorbing component in combination with CdS nanorods to make a solution-processed solar cell with 1.6 percent power conversion efficiency on both conventional glass substrates and flexible plastic substrates with stability over a 4 month testing period. |
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| Near Field Scanning Optical Microscopy (NSOM) of Nano Devices |
Dec-2008 |
77 pages |
| Authors:
Chun H Low; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis aims to investigate the optical properties of nano-devices using the technique of Near-Field Scanning Optical Microscopy (NSOM). A unique set-up to perform Atomic Force Microscopy (AFM) and NSOM simultaneously in a scanning electron microscope (SEM) to collect spatially resolved luminescence and image transport on nano-scale structures, particularly nanowires, will allow direct determination of transport parameters, such as minority carrier mobility and diffusion length that are vital to the ... |
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| Threshold Voltage Instability in A-Si:H TFTS and the Implications for Flexible Displays and Circuits |
Dec-2008 |
9 pages |
| Authors:
Z Li; E Forsythe; G Raupp; K Baugh; E Bawolek; N Darbanian; S Venugopal; R Shringarpure; L Clark; D Allee; D Morton; ARIZONA STATE UNIV TEMPE
|
| After a brief review of the characteristics of electrical stress degradation of flexible, amorphous silicon thin film transistors, the implications for various types of flexible circuitry including active matrix backplanes, integrated drivers and general purpose digital circuitry are examined. A circuit modeling tool that enables the prediction of complex circuit degradation is presented. Experimental results for a variety of flexible digital circuits including programmable logic arrays and memories are presented. ... |
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| Development of Indirect View Sensor Systems: Effects of Viewpoint Offset on Human Performance |
Dec-2008 |
8 pages |
| Authors:
Linda Mullins; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE
|
| Advances in sensor imaging technologies permit the Soldier to extend mission performance beyond daytime operations and into the night. Visual helmet-mounted displays (HMDs) have increasingly been used to provide supplemental information to the Soldier. When night vision sensors are used to present imagery on an HMD, the relation between the sensor and display results in a viewpoint offset, where the perceived location of objects in the environment is shifted or ... |
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| Symmetric Gain Optoelectronic Mixers for LADAR |
Dec-2008 |
7 pages |
| Authors:
Neal Bambha; Stephen Drew; Nuri W Emanetoglu; Justin R Bickford; MAINE UNIV AT ORONO DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We are developing a symmetric gain optoelectronic mixer for chirped-AM laser detection and ranging systems (LADAR) operating in the eye-safe 1.55 micron wavelength range. Signal processing of a chirped-AM LADAR system is simplified if the photodetector in the receiver is used as an optoelectronic mixer (OEM). Adding gain to the optoelectronic mixer allows the following transimpedance amplifier's gain to be reduced, increasing bandwidth and improving the system's noise performance. The ... |
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| Improved UV Nitride Light Emitting Diode With Engineered Spontaneous and Piezoelectric Charges |
Dec-2008 |
8 pages |
| Authors:
Michael Wraback; Paul H Shen; Meredith L Reed; Eric D Readinger; ARMY RESEARCH LAB ADELPHI MD
|
| Most III-V nitride light emitting diodes have an n-type down structure with Ga polarity. In such a device, the active layer is grown on top of the n-cladding layer and the p-type cladding layer is grown on top of the active layer. We have analyzed the band structure of such a device and found a reduced effective conduction band barrier due to the positive spontaneous and piezoelectric polarization charge, resulting ... |
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| Aligner/Bonder for Fabrication of Nanoscale Spectral and Polarimetric Sensors |
26-Nov-2008 |
5 pages |
| Authors:
Sanjay Krishna; NEW MEXICO UNIV ALBUQUERQUE CENTER FOR HIGH TECHNOLOGY MATERIALS
|
| The Center for High Technology Materials (CHTM) at the University of New Mexico had requested funds to purchase a Mask Aligner/Bond Aligner (for example, Suss-microtech MA-6/BA-6) for development of next generation sensors. The funds from this grant were used to supplement some other funds received from AFOSR and AFRL to purchase a refurbished FC-150 with a solder reflow arm. Although the Pi, Prof. Krishna, worked hard to obtain as much ... |
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| Cathodoluminescence Study of ZnO Wafers Cut from Hydrothermal Crystals |
22-Nov-2008 |
7 pages |
| Authors:
Buguo Wang; J Mass; M Avella; J Jimenez; A Rodriguez; T Rodriguez; M Callahan; D Bliss; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV
|
| ZnO is a wide bandgap semiconductor with very promising expectation for UV optoelectronics. The existence of large crystals should allow homoepitaxial growth of ZnO films for advanced optoelectronic devices. However, the ZnO substrates are not yet mature. Both defect induced by growth and by polishing together with the high reactivity of the surface are problems to their industrial application. Cathodoluminescence (CL) was used to probe the quality of substrates from ... |
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| Extremely Low Noise Carbon Nanotubes for Peltier and Photo-Detector Device Applications |
08-Oct-2008 |
44 pages |
| Authors:
Soo-Young Park; Hongkun Park; Young H Lee; Moon-Ho Jo; Ki-Bum Kim; Moon J Kim; Sungho Jin; SUNGKYUNK UNIV SUWON (SOUTH KOREA)
|
| The report contains final reports from four separate projects co-funded by AFOSR/AOARD and Korean MEST. The four projects were 1) High-Resolution, Larger-Area Nanoimprint Lithography Using Crystalline Lattice Images and Electron-Emitting Nanoprobes; 2) Extremely Low Noise Carbon Nanotubes for Peltier and Photo-detector Device Applications; 3) SiGe Alloy Nanowire Photonics; and 4) Self-Assembled Liquid Crystalline Gels: From Nanostructure to Function. |
|
| SOA-Based Optical Logic Circuit Development and Demonstration |
30-Sep-2008 |
|
| Authors:
Erich P Ippen; Leslie A Kolodziejski; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| In this program, we investigated the fabrication and optical characterization of a photonic integrated circuit (PIC) designed for telecommunication applications using ultrafast (> 100Gbits/s) optical logic. The basic components in the PIC are active components, such as semiconductor optical amplifiers (SOAs), integrated with passive, light-routing waveguides. Optical switching is accomplished by embedding the amplifiers within the arms of Mach-Zehnder interferometers (MZIs), whereas power splitting of propagating signals is carried out ... |
|
| Advanced Plasma Etching of Complex Combinations of III-V Heterostructures |
28-Sep-2008 |
4 pages |
| Authors:
Erich P Ippen; Leslie A Kolodziejski; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| The optoelectronic structures and devices, whose study will be enabled by the acquired research instrumentation, including ultra-broadband modulators, photonic crystal lasers, and very fast optical logic circuits, are of intense interest for future Air Force needs. The objective of the research instrumentation acquisition is to enhance the institution's ability to study III-V semiconductor materials and devices. An inductively-coupled plasma reactive-ion etcher will be acquired for sophisticated, on-site fabrication of photonic ... |
|
| International Semiconductor Device Research Symposium (ISDRS) 2007 College Park, MD on 12-14 Dec 2007. Support and Sponsorship |
17-Sep-2008 |
5 pages |
| Authors:
Agis A Iliadis; MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Revolutionary technologies may be required to sustain the information economy. Markets such as computing, communications, internet, networking, wireless and appliances have primarily driven the microelectronics industry. In addition to sustain these markets, the microelectronics and nanoelectronics industry needs to develop technologies for emerging markets such as medical/health, security, intelligent appliances/ robotics, energy etc. Early recognition of new possibly disruptive technologies for communication and information processing is a critical defense-relevant issue. ... |
|
| Quantum Tunneling Model of a P-N Junction in Silvaco |
01-Sep-2008 |
119 pages |
| Authors:
Jeffrey Lavery; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The focus of this research is to accurately model the tunnel junction interconnect within a multi-junction photovoltaic cell. A physically based 2-D model was created in Silvaco Inc.'s ATLAS(certified) software to model the quantum tunneling effect that is realized within a multi-junction cell. The tunnel junction interconnect is a critical factor in the design of multi-junction photovoltaics and the successful modeling of the junction will lead to the ability to ... |
|
| Analysis of Eye Movements in Change Detection with Teams Using a Simulated Tactical Situation Display |
Sep-2008 |
93 pages |
| Authors:
Camilla C Knott; William T Nelson; Megan K McCroskey; Brent T Miller; NATIONAL RESEARCH COUNCIL WASHINGTON DC
|
| Change blindness results from the absence of attention from the source of a change. Unsurprisingly, change blindness worsens in dual task and high workload conditions. Such is the environment in which teams of operators in military command and control missions operate, yet little is known about change blindness susceptibility in these conditions. A flicker task required individuals and dyads to detect changes under high and low task difficulty. Reaction time, ... |
|
| Bio-Nanotechnology Infrastructure and Technology Oriented Research |
17-Jul-2008 |
14 pages |
| Authors:
W K Jones; FLORIDA INTERNATIONAL UNIV MIAMI ADVANCED MATERIALS ENGINEERING RESEARCH INST (AMERI)
|
| FIU research concentrated in the following areas of development: nanoelectronics, bio-nanosensors, and nanomaterials, processes, and characterization. Five projects were supported: next generation information storage devices-both three-dimensional magnetic and protein-based, high power cold cathodes for microwave generators, carbon nanotube-based bio-sensors, silicon/polymer nanophotonics, and doped nanodiamonds and nanoceramic lasers for future devices. In magnetic storage devices, this work has resulted in patterned soft underlayer metallizations to localize the recording and sensitivity fields ... |
|
| High Al-content AlGaN Alloys for Deep UV Laser Applications |
16-Jun-2008 |
10 pages |
| Authors:
Hongxing Jiang; Jingyu Lin; KANSAS STATE UNIV MANHATTAN
|
| We have carried out the growth and systematic studies of the optoelectronic and structural properties of AlN epilayers. The results revealed that the threading dislocation (TD) density, in particular the edge TD density, decreases considerably with increasing the epilayer thickness. The screw dislocation density was estimated to be about 5x106 cm-2 in the 4 ?m thick AlN epilaye and is more than one order of magnitude lower than that in ... |
|
| Femtosecond Laser Passivation of GaAs Detector Material |
07-Jun-2008 |
9 pages |
| Authors:
MARTIN RICHARDSON; Glenn Boreman; Kathleen Richardson; UNIVERSITY OF CENTRAL FLORIDA ORLANDO CENTER FOR RESEARCH IN ELECTRO-OPTICS AND LASERS
|
| As devices become physically thinner, the surface to volume ratio becomes larger, so the control of surface properties becomes increasingly important. The device surface needs to be passivated in order to reduce electronically active surface states that cause noise. This seedling grant studies a new approach to passivating surfaces and has great Air Force relevance due to its importance in making smaller electronic devices. The objective is to explore the ... |
|
| Flexible Display and Integrated Communication Devices (FDICD) Technology. Volume 2 |
01-Jun-2008 |
58 pages |
| Authors:
David Huffman; Keith Tognoni; Robert Anderson; L-3 COMMUNICATIONS DISPLAY SYSTEMS ALPHARETTA GA
|
| This flexible display and integrated communication device (FDICD) technology program sought to create a family of powerful visualization technologies that would reduce the weight, volume, and power while increasing usability by integrating many of the functions of present mission equipment into a small form factor. The goals included a network comprised of a worn main computer, a hand-held or knee-worn large display system and a wrist-worn small display. The large ... |
|
| Effects of Visual Communication Tool and Separable Status Display on Team Performance and Subjective Workload in Air Battle Management |
01-Jun-2008 |
19 pages |
| Authors:
Daniel Schwartz; Benjamin A Knott; Scott M Galster; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| Tactical Air Battle Managers, such as AWACS Weapons Directors (WDs), perform as a team to effect command and control (C2) of assigned forces by planning, organizing, and directing operations. Specifically, AWACS WDs must coordinate offensive counter-air, defensive counter-air, and air refueling operations. AWACS WD teams accomplish their C2 function through networked collaboration that is typically supported by monitoring multiple radio communications channels under conditions of moderate to high ambient cabin ... |
|
| Self Assembled Semiconductor Quantum Dots for Spin Based All Optical and Electronic Quantum Computing |
17-Apr-2008 |
27 pages |
| Authors:
Hadis Morkoc; Supriyo Bandyopadhyay; Alison Baski; Shiv Khanna; VIRGINIA COMMONWEALTH UNIV RICHMOND
|
| This project involved the study of self-assembled quantum dots as hosts for spin based qubits. Both semiconductor quantum dots, nanowires, and organic quantum dots were studied and the spin relaxation times were measured. The organic Alq3 appears to have very long longitudinal spin relaxation time of nearly 1 second at a temperature of 100 K, and a nearly temperature independent transverse relaxation time > 3 nsec in the range 2-300 ... |
|
| Spatially Resolved Photocurrent Mapping of Operating Organic Photovoltaic Devices Using Atomic Force Photovoltaic Microscopy |
Jan-2008 |
7 pages |
| Authors:
B J Leever; M F Durstock; M D Irwin; A W Hains; T J Marks; L S Pingree; M C Hersam; NORTHWESTERN UNIV EVANSTON IL OFFICE OF RESEARCH SPONSORED PROJECTS
|
| A conductive atomic force microscopy (cAFM) technique, atomic force photovoltaic microscopy (AFPM), has been developed to characterize spatially localized inhomogeneities in organic photovoltaic (OPV) devices. In AFPM, a biased cAFM probe is raster scanned over an array of illuminated solar cells, simultaneously generating topographic and photocurrent maps. As proof of principle, AFPM is used to characterize OPVs, revealing substantial device to device and temporal variations in the short-circuit current. The ... |
|
| Performance Optimization of Fe-Based Light Emitting Diodes |
10 DEC 2007 |
5 pages |
| Authors:
Athos Petrou; STATE UNIV OF NEW YORK AT BUFFALO AMHERST RESEARCH FOUNDATION
|
| We have evaluated the performance of a new type of Fe spin-LED in which recombination takes place in InAs monolayers grown at the intrinsic region of an n-i-p AlGaAs(n)/GaAs(i)/AlGaAs(p) diode. The intrinsic region is a wide GaAs quantum well. The InAs layer is known as the "wetting layer" (WL). The new WL spin-LEDs were found to have the same high circular polarization as the more conventional Fe spin-LEDs , but ... |
|
| Multi-channel ZnO Nanoconductors with Tunable Optoelectrical Properties |
06 DEC 2007 |
11 pages |
| Authors:
Chuan-Pu Liu; NATIONAL CHENG KUNG UNIV TAINAN (TAIWAN)
|
| A new doping technology for controlled growth has been developed recently. Successful doping of ZnO nanomaterials is still a challenge even today due to the vapor pressure difference by orders of magnitudes between dopants and Zn and literature reports of successful doping are scarce. The alloying evaporation deposition (AED) method was used to synthesize Al doped ZnO nanowires with various doping concentrations. Several types of single-crystalline Zn and Zn/ZnO core-shell ... |
|
| A Nanocrystallite Si based Metal-Semiconductor-Metal Photosensors and Solar Energy Transformers with Enhanced Responsivity at UV-blue Wavelengths |
05 DEC 2007 |
15 pages |
| Authors:
Gong-Ru Lin; NATIONAL TAIWAN UNIV TAIPEI (TAIWAN) GRADUATE INST OF ELECTRO-OPTICAL ENGINEERING
|
| Structural damage enhanced near-infrared electroluminescence (EL) of a metal-oxide-semiconductor light emitting diode (MOSLED) made on SiOx film with buried nanocrystallite Si after CO2 laser rapid-thermal-annealing (RTA) at an optimized intensity of 6 kW/cm2 for 1 ms is demonstrated. CO2 laser RTA induced oxygen-related defects are capable of improving Fowler-Nordheim tunneling mechanism of carriers at metal/SiOx interface. The CO2 laser RTA SiOx film reduces Fowler-Nordheim tunneling threshold to 1.8 MV/cm, facilitating ... |
|
| Growth and Characterization Studies of InGaN for Optoelectronics, Electronics and Photovoltaic Applications |
04 DEC 2007 |
10 pages |
| Authors:
Chih-Chung Yang; NATIONAL TAIWAN UNIV TAIPEI (TAIWAN) GRADUATE INST OF ELECTRO-OPTICAL ENGINEERING
|
| In the past few years, we have been performing the research on the growth and characterization of InGaN/GaN nanostructures. Based on those nanostructures, we fabricated efficient dual-color and white-light light-emitting diodes. Meanwhile, we studied the coupling between surface plasmon and InGaN/GaN quantum wells for enhancing the emission efficiency. The detailed research topics are shown as follows 1. Prestrain growth of InGaN/GaN quantum wells for increasing indium incorporation 2. Fs pump-probe ... |
|
| Mid-Infrared MIS Light Emitter from Strained Ge on Si with Nano-Structure Enhancement |
20 NOV 2007 |
26 pages |
| Authors:
Chee Wee Liu; NATIONAL TAIWAN UNIV TAIPEI
|
| This project involved the observations of near-infrared emissions from Si/Ge heterojunctions and Ge quantum dot metal-oxide-semiconductor light-emitting diodes. |
|
| Platinum Complexes with Optical Limiting and Related Non-linear Optical and Electronic Properties |
NOV 2007 |
6 pages |
| Authors:
Michael Bruce; ADELAIDE UNIV (AUSTRALIA) DEPT OF CHEMISTRY
|
| This project consisted of applying several synthetic approaches, some derived from model studies of molecular wires, to the production of several novel types of platinum-alkynyl complexes. |
|
| Characterization of Transparent Organic Light-Emitting Device (TOLED) |
NOV 2007 |
34 pages |
| Authors:
David Y. Chin; Steven M. Blomquist; Eric Forsythe; Jianmin Shi; David Morton; ARMY RESEARCH LAB ADELPHI MD
|
| Typical OLEDs are constructed in a bottom-emitting configuration where active organic layers are deposited on top of a transparent electrode, such as indium-tin-oxide (ITO), and then a non-transparent low function metal cathode, such as Mg, Ca, Li, is deposited as the top electrode. When appropriate current and voltage are applied to the electrodes, the organic layers are activated, and light is produced which can be seen at the transparent ITO ... |
|
| An in vitro Corneal Model with a Laser Damage Threshold at 2 Micrometers That is Similar to That in the Rabbit |
Nov-2007 |
13 pages |
| Authors:
Robert J Thomas; Michael S Foltz; Michael L Denton; Kurt J Schuster; Larry E Estlack; NORTHROP GRUMMAN SAN ANTONIO TX
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| Corneal organotypic cultures were generated as per existing methods, which included growth on polycarbonate inserts and air-lifting for one week. The corneal simulant cultures were exposed, with real-time IR imaging, to the 2-micron wavelength output of a thulium fiber laser with 4 mm beam diameter for 0.25 seconds in a thermally controlled environment and then assayed for damage. The in vitro threshold (ED50 value of 12.5 W/sq cm) and peak ... |
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| High Mobility Conjugated Polymers |
20 OCT 2007 |
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| Authors:
Samson A. Jenekhe; WASHINGTON UNIV SEATTLE DEPT OF CHEMICAL ENGINEERING
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| The performance of all current polymer electronic devices, such as organic field-effect transistors (OFETs), photovoltaic cells, and photodetectors, is limited primarily by the low charge carrier mobilities of current materials. To address this problem this project investigated various polymer semiconductors exhibiting high carrier mobilities and explored their device applications in electronics, optoelectronics, and nanoelectronics. Field-effect electron mobilities as high as 0.1 sq cm/Vs in a spin coated thin films of ... |
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| Design of the Transmission Electron Microscope (TEM) Sampler Scriber Template as Developed to Improve and Simplify the Sample Preparation Procedure |
OCT 2007 |
28 pages |
| Authors:
Wendy L. Sarney; ARMY RESEARCH LAB ADELPHI MD
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| The image quality and visibility of the crystal planes in a TEM sample directly relate to how we initially cleave the wafer during the sample preparation process. For diffraction-contrast imaging, many defects and other crystalline features are orientation specific, and are only visible along certain zone axes. The resolution limits of the TEM dictate the preferred zone axes for phase-contrast imaging. The TEM Sample Scribing Template described here allows easy ... |
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| Localized Surface Plasmon Resonance of Metal Nanodot Nanowire Arrays Studied by Far-Field and Near-Field Optical |
05 SEP 2007 |
8 pages |
| Authors:
Heh-Nan Lin; NATIONAL TSING HUA UNIV HSINCHU (TAIWAN) DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| A combination of AFM nanomachining and lift-off process based on the one-layer approach is a convenient method for the fabrication of metal nanostructures. For an obtained Au nanodot array with an average diameter of 72 nm, the resonance peak in the LSPR scattering spectrum is located at 548 nm and consistent with simulated spectrum from Mie theory. For the Au nanowire arrays, the LSPR scattering spectra are composed of two ... |
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Electrooptical and Optoelectronic Devices
