| 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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| 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 |
36 pages |
| Authors:
Kingsley Fletcher; Stuart Sutherland; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
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| 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 |
36 pages |
| 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
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| 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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| 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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| 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
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| 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
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| 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. |
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| SOA-Based Optical Logic Circuit Development and Demonstration |
30-Sep-2008 |
10 pages |
| 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 ... |
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| 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 ... |
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| 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. ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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
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| 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 ... |
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| 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
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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 ... |
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| 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. |
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| 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. |
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| 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 ... |
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| 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
|
| 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 |
|
| Authors:
Samson A. Jenekhe; WASHINGTON UNIV SEATTLE DEPT OF CHEMICAL ENGINEERING
|
 | 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
|
| 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
|
| 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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| Hybrid Micro-Electro-Mechanical Tunable Filter |
SEP 2007 |
202 pages |
| Authors:
Edward M. Ochoa; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| While advantages such as good thermal stability and processing-chemical compatibilities exist for common monolithic-integrated micro-electro-mechanically tunable filters (MEM-TF) and MEM-tunable vertical cavity surface emitting lasers (MT-VCSEL), they often require full processing to determine device characteristics. Alternatively, the MEM actuators and the optical parts may be fabricated separately, then subsequently bonded. This "hybrid approach" potentially increases design flexibility. Since hybrid techniques allow integration of heterogeneous material systems, "best of breed" compound ... |
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| Sensor Model Requirements for TAWS/IRTSS Operation |
SEP 2007 |
123 pages |
| Authors:
Rachel Hughes; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Possible improvements to the minimum resolvable temperature difference (MRTD) entered into TAWS are considered. FLIR92 is modified to include atmospheric turbulence that depends on height in the atmosphere. Resultant MRTDs are compared to the operational FLIR92 MRTD predictions excluding atmospheric turbulence. The difference in the MRTD is only apparent in the higher frequency regime and is less than 0.05% of the MRTD values for a typical test case. MRTD is ... |
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| Specific Approach for Size-Control III-V Quantum/Nano LED Fabrication for Prospective White Light Source |
10 AUG 2007 |
12 pages |
| Authors:
Huey-Liang Hwang; NATIONAL TSING HUA UNIV HSINCHU (TAIWAN) INST OF ELECTRONICS ENGINEERING
|
| This research achieved a nano-structure LED to enhance the light extraction efficiency in III-V nitride LED. The Triangular lattice PC LED with diameter/periodicity of 300/500nm were patterned separately using the AAO template, E-beam lithography, and then the ICP etching technique. The PC LED could get low and stable forward voltage as compared to the AAO LED and conventional LED. The optical and electrical properties of the nano-structure LED was demonstrated ... |
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| Processing, Properties and Morphology of Optical Limiting Silk Membranes |
11 JUL 2007 |
16 pages |
| Authors:
Darrell Reneker; AKRON UNIV OH
|
| This grant supported the exploratory research in optical limiting silk membranes and coatings to protect DOD sensors from strong IR radiation. |
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| GaN Light-Emitting Triodes (LETs) for High-Efficiency Hole Injection and for Assessment of the Physical Origin of the Efficiency Droop |
06 JUL 2007 |
13 pages |
| Authors:
E. F. Schubert; Jong K. Kim; RENSSELAER POLYTECHNIC INST TROY NY
|
| The light-emitting triode (LET) is a three-terminal p-n junction device that accelerates carriers in the lateral direction, i.e. parallel to the p-n junction plane, by means of an electric field between two anodes. The lateral field provides additional energy to carriers thereby allowing them to overcome barriers and increasing the carrier injection efficiency into the active region. Both the current between Anode 1 and the cathode, and the light-output power ... |
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| High Efficiency and Long Life Photovoltaic Research for Space Applications |
05 JUL 2007 |
12 pages |
| Authors:
Wei-Fang Su; NATIONAL TAIWAN UNIV TAIPEI (TAIWAN) DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| We have developed a tree-like nanostructured photovoltaic device based on the polymer poly"3-hexylthiophene""P3HT"/metal oxide hybrid materials by solution processes at low temperature. An array of large ZnO nanorods with a larger size of 50 nm in diameter and 150 nm in length are grown to act as tree trunks for efficient charge collection. Small TiO2 nanorods with a size of 5 nm in diameter and 20 nm in length are ... |
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| DARPA Quantum Network Testbed |
JUL 2007 |
|
| Authors:
Chip Elliott; Henry Yeh; BBN TECHNOLOGIES CAMBRIDGE MA
|
| BBN has designed and built the world's first Quantum Network testbed, delivering end-to-end network security via high-speed Quantum Key Distribution (QKD), and testing that Network against sophisticated eavesdropping attacks. BBN has fielded this ultrahigh-security network into commercial fiber across the metro Boston area. BBN's QKD network comprises 10 nodes. It is both extremely secure and 100% compatible with today's Internet technology. Four of the 10 nodes are running 24x7 over ... |
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| Polymer-Oxide Nanolayer/Al Composite Cathode for Efficient Polymer Light-Emitting Diodes |
30 JUN 2007 |
38 pages |
| Authors:
Tzung-Fang Guo; Ten-Chin Wen; NATIONAL CHENG KUNG UNIV TAINAN (TAIWAN)
|
| This research investigates the function of the polymer-oxide material as the interfacial buffer layer for the fabrication of high performance organic/polymer light-emitting diodes (O/PLEDs). The author proposed to place a salt-free, polymer-oxide nanolayer at the interface between the light-emissive polymer layer with Al as the device cathode instead of using low work function metals, such as Ca or LiF/Al. The processes for preparing the interfacial nanolayer can be easily integrated ... |
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| Analysis of an Optical Channelization Technique for Microwave Applications |
27 JUN 2007 |
20 pages |
| Authors:
Matthew S. Rogge; Vincent J. Urick; Frank Bucholtz; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
|
| Increasing electrical bandwidth combined with improved optical filtering allow for a new class of optical channelizers for use in radiofrequency, microwave, and millimeter-wave applications. After a brief review of existing channelization technology, an optical channelizer that uses optical local oscillators and optical filters is analyzed. Linearity and other limitations of the scheme show a strong dependence on the linearity of the optical modulator. The optical modulator is explored in both ... |
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| Radiometric Characterization of a New Photovoltaic Cell Unit for Powering Modulating Retroreflectors |
19 JUN 2007 |
18 pages |
| Authors:
Xiaolei Zhang; James Murphy; G. C. Gilbreath; NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
|
| We describe the experimental procedures and results of a detailed radiometric characterization of a new photovoltaic (PV) wafer unit intended for powering the Multiple Quantum Well (MQW) Modulating Retroreflector (MRR) using natural sunlight and/or system laser light as energy input, to enable autonomous operation of free-space optical data link using the MQW-MRR. Our initial measurements show that the PV wafer unit has an average power conversion efficiency of 7% to ... |
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| Observation and Study of Dislocation Etch Pits in Molecular Beam Epitaxy Grown Gallium Nitride With the Use of Phosphoric Acid and Molten Potassium Hydroxide |
JUN 2007 |
18 pages |
| Authors:
Fred Semendy; Unchul Lee; ARMY RESEARCH LAB ADELPHI MD
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| Defects continue to challenge the functionality and reliability gallium nitride (GaN)-based devices. GaN grown on sapphire by molecular beam epitaxy was investigated by wet etching in hot phosphoric acid (H3PO4) and molten potassium hydroxide (KOH). Hexagonally shaped etch pits were formed on the etched sample surfaces. Etched samples were characterized with the use of atomic force microscopy (AFM) and scanning electron microscopy (SEM) and SEM cathode luminescence (SEM-CL). AFM images ... |
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| Simulation Methods for Rare Events in Nonlinear Lightwave Systems |
31 MAY 2007 |
6 pages |
| Authors:
William L. Kath; NORTHWESTERN UNIV EVANSTON IL SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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| The objectives of this project were to develop new hybrid analytical/computational methods that are capable of simulating the rare events that are the determining factors of the performance of lightwave systems and devices. These methods use the following: (1) analytical techniques, such as perturbation and asymptotic methods, to guide numerical simulations using importance sampling; and (2) adaptive numerical methods, such as the multicanonical Monte Carlo and cross-entropy methods, to perform ... |
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| Fabrications and Characterizations of ZnO/Zn1-xMgxO Nanorod Quantum Structures |
15 MAY 2007 |
11 pages |
| Authors:
Gyu-Chul Yi; POHANG UNIV OF SCIENCE AND TECHNOLOGY (REPUBLIC OF KOREA) DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| Semiconductor nanorod heterostructures open up significant opportunities for fabrication of electronic and photonic nanodevices on single nanorods. The semiconductor nanorod quantum structures with well-defined interfaces are main components for nanoscale resonant tunneling devices, field effect transistors, and light-emitting devices since the nanorod quantum structures (QSs) enable novel physical properties such as quantum confinement and formation of minibands. In particular, spectral wavelength can be tuned by varying the well thickness, and ... |
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| Nanostructured Sublayers for Improved Light Extraction of Top-Emitting and Transparent Organic Electroluminescent Devices |
MAY 2007 |
29 pages |
| Authors:
Byung D. Chin; KOREA INST OF SCIENCE AND TECHNOLOGY SEOUL
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| The work focused on developing flat-panel transparent display using organic light emitting diode. Microstructure Bragg mirrors were also implemented for higher external luminous efficiency and wider color gamut. In addition, organic phosphorescent light emitting materials and devices were studied. |
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Electrooptical and Optoelectronic Devices
