| Layered Organization in the Coastal Ocean: Acoustical Data Acquisition Analyses and Synthesis |
04-Nov-2009 |
61 pages |
| Authors:
D V Holliday; RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
|
 | The research conducted with the funding made available through this grant was from an ONR Departmental Research Initiative (DRI). The objective of the DRI was to better understand Layered Organization in the Coastal Ocean (LOCO). The explicit goal of the DRI was To understand the properties of densely concentrated, thin layers of planktonic biota that can occur in coastal ocean environments, and the interacting physical, chemical, biological and optical processes ... |
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| Free-Space Quantum Key Distribution using Multilevel Encoding via Transverse Field Modulation: Preprint |
01-Aug-2009 |
6 pages |
| Authors:
Mark T Gruneisen; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
|
| Transverse modulation of the complex optical field defines sets of orthogonal states for multilevel quantum key distribution. Principles of holography are evaluated as a means of generating and sorting the single photon states. |
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| Quantum Enhanced Imaging by Entangled States |
Jul-2009 |
123 pages |
| Authors:
Doyle Nichols; NORTHROP GRUMMAN SYSTEMS CORP LINTHICUM HEIGHTS MD
|
| The use of entangled states in a prospective standoff imaging sensor has been explored. Specifically, the question of whether enhanced performance (in terms of achievable resolution, in particular) may be obtained through the use of entangled states in a ghost imaging configuration has been investigated. The resiliency of such a system in the presence of transmission impairments that necessarily accompany sensors in a tactical environment, such as large optical loss, ... |
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| A New Sodium Guidestar Adaptive Optics System for the Starfire Optical Range 3.5 m Telescope (Postprint) |
18-May-2009 |
6 pages |
| Authors:
ROBERT JOHNSON; Dennis Montera; Timothy Schneeberger; James Spinhirne; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
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| A new adaptive optics is being installed on the Starfire 3.5 m telescope. Its uses the existing 50 watt pump to create a sodium guidestar. Transmission to the wavefront sensor is improved from 0.16 to 0.75. |
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| Continued Development of the Look-up-Table (LUT) Methodology for Interpretation of Remotely Sensed Ocean Color Data |
30-Apr-2009 |
28 pages |
| Authors:
W P Bissett; FLORIDA ENVIRONMENTAL RESEARCH INST TAMPA FL
|
| The overall goal of this work is to refine and validate a spectrum-matching and look-up-table (LUT) technique for rapidly and accurately inverting remotely sensed hyperspectral reflectances to extract environmental information such as water-column optical properties, bathymetry, and bottom classification. OBJECTIVES We (PI - Bissett, and C. Mobley, N0001406C0177) are developing and evaluating techniques for the extraction of environmental information including water-column inherent optical properties (IOPs) and shallow-water bathymetry and bottom ... |
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| Water Transmission of 1440-nm Femtosecond Pulses |
24-Apr-2009 |
21 pages |
| Authors:
David Lukofsky; Marc Currie; Ulf Oesterberg; THAYER SCHOOL OF ENGINEERING HANOVER NH
|
| This report presents the results of an experiment investigating the transmission of intense femotosecond pulses on the 1445-nm resonance of water. The goal was to detect the presence of resonant bleaching behavior, which could explain the results observed by Fox and Oesterberg in 2005 at the 800-nm wavelength. |
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| Multidisciplinary Biomarkers of Early Mammary Carcinogenesis |
01-Apr-2009 |
7 pages |
| Authors:
Julie Ostrander; DUKE UNIV DURHAM NC
|
| The purpose of the proposed research is to develop novel optical technologies to identify high-risk premalignant changes in the breast. Our proposed research will first test specific optical parameters in breast cancer cell lines and models of early mammary carcinogenesis, and then develop methods to test the optical parameters in random periareolar fine needle aspirate (RPFNA) samples from women at high-risk for developing breast cancer. Over the last year, we ... |
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| The Effects of Selected Modelling Parameters on the Computed Optical Frequency Signatures of Naval Platforms |
Apr-2009 |
93 pages |
| Authors:
Susan Smith; DEFENSE SCIENCE AND TECHNOLOGY ORGANIZATION VICTORIA (AUSTRALIA) MARITIME PLATFORMS DIV
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| An investigation has been carried out into the effects of wireframe detail and model subprocessing on the predicted optical frequency (OF) signature of a platform. This report describes the results of that investigation. Overall it is concluded that to be able to compare the computed OF signatures of different platforms with validity, the models of the platforms have to incorporate the same level of wireframe detail, especially in internally-heated regions ... |
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| Wave Optics Simulation of Optically Augmented Retroreflections for Mononstatic/Bistatic Detection |
Mar-2009 |
|
| Authors:
Tatar; John J III; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | Optical devices interrogated with a laser in the appropriate band can exhibit strong, deterministic reflections of the incident beam. This characteristic could be exploited for optical target detection and identification. The distribution of reflected power is strongly dependent on the geometry of the interrogation scenario, atmospheric conditions, and the cross section of the target optical device. Previous work on laser interrogation systems in this area has focused on analytic models ... |
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| Assessment of Weather Sensitivites and Air Force Weather (AFW) Support to Tactical Lasers in the Lower Troposphere |
Mar-2009 |
83 pages |
| Authors:
Francesco J Echeverria; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| ATL scientists need to develop a full understanding of the interaction effects between a high-energy laser beam and the atmosphere through which it propagates. Achieving this understanding is important for many reasons. In particular, the high cost of DE weapons systems makes each propagation event expensive. Having an understanding of the atmosphere in which a high-energy laser propagates will increase efficiency and effectiveness of the ATL weapon system, which in ... |
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| Utilizing Microelectromechanical Systems (MEMS) Micro-Shutter Designs for Adaptive Coded Aperture Imaging (ACAI) Technologies |
Mar-2009 |
131 pages |
| Authors:
Mary M Ledet; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| The Air Force has long relied on surveillance for intelligence and strategic purposes. Most surveillance systems rely on a lensing system to acquire their images, most of which are in either the visible or infrared wavelengths. Because lensing systems can be expensive, obtrusive, or hard to maintain, researchers have designed adaptive coded aperture imaging (ACAI) as a replacement system. Coded aperture imaging(CAI) has been used in both the astronomical and ... |
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| Effects of Contact Load on the Fretting Fatigue Behavior of IN-100 at Elevated Temperature |
Mar-2009 |
173 pages |
| Authors:
Traylor; Alfred G II; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis studied the effects of contact load of 8006 N on the fretting fatigue behavior of IN-100 at an elevated temperature of 600 deg C. First, S-N curves were created for a range of applied axial stresses at an identical stress ratio of 0.03 at 8006 N. A condition of partial slip condition necessary to fretting fatigue was verified by generating hysteresis loops, plotting shear force against axial stress. ... |
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| Impact of Aerosols on Scene Collection and Scene Correction |
Mar-2009 |
135 pages |
| Authors:
Kevin M Quinn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Airborne aerosols contaminate satellite imagery, making it difficult for analysts to characterize surface targets. The amount of contamination is due to aerosol loading, best quantified by aerosol optical depth (AOD). Level 2 AERONET data provides ground truth AOD measurements. Unfortunately, targets are not likely to be near an AERONET station. This thesis examines two methods of quantifying AOD in lieu of AERONET data: Moderate Resolution Imaging Spectroradiometer (MODIS) AOD retrievals ... |
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| A Computational Tool for Evaluating THz Imaging Performance in Brownout Conditions at Land Sites Throughout the World |
Mar-2009 |
65 pages |
| Authors:
Seth L Marek; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| This study quantifies terahertz (THz) or sub-millimeter imaging performance during simulated rotary-wing brownout or whiteout environments based on geographic location and recent/current atmospheric weather conditions. The atmospheric conditions are defined through the Air Force Institute of Technology Center for Directed Energy (AFIT/CDE) Laser Environmental Effects Definition and Reference or LEEDR model. This model enables the creation of vertical profiles of temperature, pressure, water vapor content, optical turbulence, and atmospheric particulates ... |
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| Investigation of Panchromatic Satellite Imagery Sensor Low Bias in Shadow Method Aerosol Optical Depth Retrieval |
Mar-2009 |
77 pages |
| Authors:
Brian J Rivenbark; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A technique known as the Shadow Method was developed for calculating aerosol optical depths by measuring the radiance difference between shaded and unshaded regions in high-resolution satellite imagery by Vincent (2006). Previous research investigated use of the Shadow Method in regions of dust obscuration using buildings and clouds as shadow generation sources and a variety of background surfaces. A recurring low bias was seen when using the Shadow Method with ... |
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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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| Polarized Light in Coastal Waters: Hyperspectral and Multiangular Analysis |
Mar-2009 |
19 pages |
| Authors:
Jing Zhou; Deric J Gray; Alberto Tonizzo; Alexander Gilerson; Michael S Twardowski; Robert A Arnone; Barry M Gross; Fred Moshary; Samir A Ahmed; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| Measurements of the underwater polarized light field were performed at different stations, atmospheric conditions and water compositions using a newly developed hyperspectral and multiangular polarimeter during a recent cruise in the coastal areas of New York Harbor - Sandy Hook, NJ region (LISA). Results represented for waters with chlorophyll concentrations 1.3-4.8-micrometer g/1 and minerals concentrations 2.0- 3.9mg/1. Angular and spectral variations of the degree of polarization are found to be ... |
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| In-Fiber Magneto-Optic Devices Based on Ultrahigh Verdet Constant Organic Materials and Holey Fibers |
02-Feb-2009 |
30 pages |
| Authors:
Nasser Peyghambarian; Andre Persoons; Robert A Norwood; ARIZONA UNIV BOARD OF REGENTS TUCSON
|
| A high sensitivity Verdet constant measurement system was developed that obtained Verdet constants for commercially available standards in excellent agreement with the literature. We have observed Verdet constants of approximately 100,000 degrees/T-m in regioregular polythiophenes and shown that the regioregularity and processing conditions critically effect their properties. New magnetite nanoparticle/acrylate polymer core/shell nanocomposites with exceptional transparency across the visible/IR have been developed. These composites exhibit Verdet constants 100,000 degrees/T-m in ... |
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| Four-Channel Threshold Detector With Optical Isolation |
Feb-2009 |
26 pages |
| Authors:
Mark R Morgenstern; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| The four-channel window comparator discussed in this report is a safety switch that can be used to limit a range of test variables such as voltages, currents, temperatures or other values that can be scaled to a voltage within +-13 V. This device is simple, reliable, rugged, and requires no external control hardware or software. This module is scalable and reconfigurable to support nearly any test apparatus. |
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| Propulsion and Power Rapid Response Research and Development Support: Fundamental Science Investigations for Propulsion and Power Systems |
Jan-2009 |
236 pages |
| Authors:
Donald B Hanson; UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| Research was conducted for the Propulsion Directorate's research and development efforts in core technology areas for turbine engines, hypersonics, and aerospace power. Experimental and theoretical research was conducted in the technical disciplines of fuels and combustion; mechanical subsystems and life management; aerodynamics; aerospace power systems including applied and high temperature superconductivity, physics of electrical discharges, applied atomic and molecular spectroscopy, thermophysics and high temperature dielectric materials, thermal nanofluids for heat ... |
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| Characterizations of Minerogenic Particles in Support of Modeling Light Scattering in Lake Superior Through a Two-Component Approach |
Jan-2009 |
16 pages |
| Authors:
Feng Peng; David O'Donnell; Alan D Weidemann; Steve W Effler; Martin T Auer; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| The role of suspended minerogenic particles in light scattering in eastern Lake Superior and Keweenaw Bay (II sites) during July of 2006 was evaluated with an individual particle analysis technique (scanning electron microscopy interfaced with automated image and X-ray analyses, SAX), along with bulk paniculate scattering and backscattering coefficients (bp and bbp) and chlorophyll a concentration ([ChI]). SAX measurements provide light-scattering attributes of minerogenic particles, including chemical composition and particle ... |
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| (A Mulitimodal Ultramicrospectroscope(MUMS): Imaging with Integrated Spectroscopies for Chemical and Biomolecular Identification*): Scientific Progress and accomplishments |
Jan-2009 |
5 pages |
| Authors:
RICE UNIV HOUSTON TX
|
| Nanoshells form the basic substrate for many of the surface enhanced spectroscopic studies undertaken under this MURI. We have developed a general facile technique to metallize dielectric nanoparticles. We hope this would widen the appeal of core-shell nanoparticles and simplify the production of larger quantities of core-shell nanoparticles. The SERS, and SERS-SEIRA techniques developed previously have been applied to elucidate reaction pathways in a metal catalyzed reaction, sensing small molecules ... |
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| Cascade Optical Chromatography for Sample Fractionation |
Jan-2009 |
7 pages |
| Authors:
Alex Terray; Joseph D Taylor; Sean J Hart; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Optical chromatography involves the elegant combination of opposing optical and fluid drag forces on colloidal samples within microfluidic environments to both measure analytical differences and fractionate injected samples. Particles that encounter the focused laser beam are trapped axially along the beam and are pushed upstream from the laser focal point to rest at a point where the optical and fluid forces on the particle balance. In our recent devices particles ... |
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| Flip Chip Bonding of 68 x 68 MWIR LED Arrays |
Jan-2009 |
6 pages |
| Authors:
Naresh C Das; Monica Taysing-Lara; Kimberley A Olver; Fouad Kiamilev; J P Prineas; J T Olesberg; E J Koerperick; L M Murray; Tom F Boggess; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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| The flip chip bonding process is optimized by varying the bonding pressure, temperature, and time. The 68 68 mid wave infrared (MWIR) LED array was hybridized onto Si-CMOS driver array with same number of pixels. Each pixel has two indium bumps, one for cathode and another for anode. Both LED array and CMOS drivers have 15- m-square Indium bump contact pads. We used Karl Suss FC150 flip chip machine for ... |
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| Rotorcraft Brownout: Advanced Understanding, Control and Mitigation |
31-Dec-2008 |
22 pages |
| Authors:
J G Leishman; MARYLAND UNIV COLLEGE PARK DEPT OF AEROSPACE ENGINEERING
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| The MURI team has started to undertake a carefully planned program of research, including the development of efficacious predictive models for the physical elements that may contribute to the brownout problem. This goal will be achieved by better understanding rotor and airframe aerodynamics when operating in ground effect, as well as how the interaction of rotor wake vortices with the sediment bed occurs, the particulate uplift processes, and the two-phase ... |
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| UMD/NPS Free Electron Laser Research |
01-Dec-2008 |
77 pages |
| Authors:
Joseph Blau; William B Colson; MARYLAND UNIV COLLEGE PARK
|
| Simulations and theoretical analysis are used to study the development of high-average-power free electron lasers (FELs). Various existing and proposed FELs are studied, in both amplifier and oscillator configurations. Comparisons to experimental results show good agreement in each case. At the outset of this project, short Rayleigh length (SRL) optical cavities were proposed to reduce the optical intensity on the mirrors. Contrary to conventional wisdom, our simulations showed that an ... |
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| Development Of Frequency Transfer Via Optical Fiber Link at NICT |
01-Dec-2008 |
11 pages |
| Authors:
Mizuhiko Hosokawa; Motohiro Kumagai; Mihu Fujieda; Tadahiro Gotoh; NATIONAL INST OF INFORMATION AND COMMUNICATIONS TECHNOLOGY (NICT) TOKYO (JAPAN)
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| NICT in Japan has developed a radio frequency (RF) dissemination system using an optical fiber link. The phase noise induced during the transmission through the optical fiber is actively cancelled by a compensation system. A proving test has been conducted on the 114-km urban telecom optical fiber link in Tokyo. The transfer stability in the 10-18 level at an averaging time of 1 day was achieved. In the last few ... |
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| Progress on a Portable Rubidium Fountain Frequency Standard |
01-Dec-2008 |
9 pages |
| Authors:
S R Jefferts; T P Heavner; P D Kunz; NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO TIME AND FREQUENCY DIV
|
| We are developing a simple and transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. The optical package for this system uses DFB (distributed feedback) diode lasers and a frequency offset locking scheme to generate the optical frequencies needed for laser-cooling, launching, post-cooling, and detection of Rb atoms. This atomic fountain will be useful as a transfer standard and secondary standard for calibrating nontransportable frequency standards, as well as a measurement ... |
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| Continuous System-Level Scale for Comparing Laser Gain Media |
Dec-2008 |
24 pages |
| Authors:
Jeffrey O White; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Several quantities are proposed for facilitating a quantitative comparison of laser gain media, operating temperatures, pump, and laser wavelengths. They are based on the occupation probability of absorbing and emitting pump and laser levels. The system level, l, has a numerical value coinciding with conventional usage of the terms two-, three-, and four-level systems. The occupation factor has a value from -1 to +1, and is appropriate for describing an ... |
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| Multiphysics Modeling of a Novel Photoelastic Modulator for Ultra-High Performance FT Spectrometry |
Dec-2008 |
7 pages |
| Authors:
Tudor N Buican; Arthur H Carrieri; SEMIOTIC ENGINEERING ASSOCIATES LLC ALBUQUERQUE NM
|
| We present the multiphysics model and simulation of a virtual stack/phased array (VSPA) photoelastic modulator (PEM), a novel type of high-retardation PEM for use in ultra-high performance FT spectrometers with applications in the optical recognition of explosives and CB warfare agents. The multiphysics model consists mainly of coupled partial differential equations (PDE) describing high-intensity acoustic fields driven by a phased array of attached piezoelectric transducers (PZT) and the coupled heat ... |
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| Phased-Array Monolithic PEM for FT Spectrometry With Applications in Explosive Detection and CB Defense |
Dec-2008 |
9 pages |
| Authors:
Tudor N Buican; Arthur H Carrieri; SEMIOTIC ENGINEERING ASSOCIATES LLC ALBUQUERQUE NM
|
| We present the theory and multiphysics simulation of a novel type of photoelastic modulator (PEM) for use in ultra-high performance FT spectrometers with applications in the optical recognition of explosives and CB warfare agents. This new technology is based on the strain birefringence induced along a bar-shaped optical element by a phased array of piezoelectric transducers (PZT). Appropriate phase and amplitude relationships among the array PZTs ensure that induced birefringence ... |
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| Assembly of Proteorhodopsin for Bioinspired Alternative Energy Applications |
Dec-2008 |
3 pages |
| Authors:
C Nguyen; J Ingram; H Liang; G Stucky; MILITARY ACADEMY WEST POINT NY DEPT OF CHEMISTRY
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| Proteorhodopsin is an integral membrane protein that functions as a light-driven proton pump, which serves as the basis for an alternative energy device. While many membrane proteins are becoming understood, both structurally and mechanistically, little technology exists for the production and incorporation of this important class of molecules into useful devices. The advantage we have in working with proteorhodopsin is that it can be genetically modified and grown in the ... |
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| DNA-Based Chiral Composites with Enhancement of Chirooptic and NLO Effects for NIMS Applications |
24-Nov-2008 |
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| Authors:
Marek Samoc; Anna Samoc; AUSTRALIAN NATIONAL UNIV CANBERRA
|
| In March 2008 we started a new research program on enhancement of chirooptic and nonlinear optical properties in composites based on deoxyribonucleic acid (DNA) derived from marine sources (salmon roe). During the first half-year period of the project we worked on preparation and characterization of the hybrid composites that utilize DNA as a chiral template for assembling non-chiral organic conjugated molecules and noble metal nanoparticles. This combination could potentially lead ... |
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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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| Efficient THZ Source Based on Cascaded Optical Down-Conversion in Orientation-Patterned GaAs Structures |
20-Nov-2008 |
34 pages |
| Authors:
Xiaojun Yu; Walter Hurlbut; Vladimir Kozlov; James Harris; Anjie Lin; Paulina Kuo; Joe Schaar; Martin Fejer; Konstantin Vodopyanov; Candace Lynch; David Bliss; Yun-Shik Lee; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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| The goal of this DARPA TIFT project was to demonstrate an efficient room temperature source for THz imaging systems based on optical down-conversion in an orientation-patterned GaAs microstructure, incorporated into an optical resonant cavity, and pumped by a compact solid state laser. The main achievements are: (1) quasi-phase-matched (QPM) GaAs microstructures with periodic reversal of crystalline orientation, including orientation-patterned GaAs (OPGaAs), diffusion-bonded GaAs (DB-GaAs) and optically-contacted GaAs (OC-GaAs) suitable for ... |
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| Spinel as Exit Aperture Window for HEL Systems |
17-Nov-2008 |
30 pages |
| Authors:
Jasbinder Sanghera; Ishwar Aggarwal; Shyam Bayya; Guillermo Villaiobos; Woohong Kim; David Reicher; Stan Peplinski; Al Ogolza; NAVAL AIR WARFARE CENTER CHINA LAKE CA RESEARCH DEPT
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| Spinel is an excellent candidate for HEL windows. Significantly better than glass materials: 3x stronger and harder, 10x higher thermal conductivity, significantly better thermal shock resistance, OPD is comparable to OFG and better Silica, significantly superior environmental ruggedness. Successfully developed rugged, low-loss AR coatings for Spinel. Demonstrated fabrication of a large Spinel window. Availability of high optical quality AR coated Spinel windows will have a significant impact on all DoD ... |
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| Influence of Atmospheric and Sea-Surface Corrections on Retrieval of Bottom Depth and Reflectance Using a Semi-Analytical Model: A Case Study in Kaneohe Bay, Hawaii |
01-Oct-2008 |
11 pages |
| Authors:
ZhongPing Lee; James A Goodman; Susan L Ustin; MIAMI UNIV FL
|
| Hyperspectral instruments provide the spectral detail necessary for extracting multiple layers of information from inherently complex coastal environments. We evaluate the performance of a semi-analytical optimization model for deriving bathymetry, benthic reflectance, and water optical properties using hyperspectral AVIRIS imagery of Kaneohe Bay, Hawaii. We examine the relative impacts on model performance using two different atmospheric correction algorithms and two different methods for reducing the effects of sun glint. We ... |
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| Microscopic Optical Characterization of ZnO Bulk Crystals, Free Standing III-Nitride Substrates and III-V Structures for Non-Linear Optics |
01-Oct-2008 |
95 pages |
| Authors:
J Mass; M Avella; Jimenez; Juan Lopez; A Martin; O Martinez; UNIVERSIDAD DE VALLADOLID (SPAIN)
|
| This report results from a contract tasking Universidad de Valladolid as follows: Objective 1: To study the influence of the growth parameters on the defects and inhomogeneities of ZnO crystals grown by Hydrothermal technique. This technique has the advantage of large bulk crystal production, but presents the possibility of unintentional impurity introduction. Furthermore, the incorporation of impurities is not uniform. This objective will be achieved by the way of: Analysis ... |
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| Extractive Sampling and Optical Remote Sensing of F-100 Aircraft Engine Emissions (PREPRINT) |
Oct-2008 |
30 pages |
| Authors:
Ram Hashmonay; Jan Satola; Kenneth Cowen; Bradley Goodwin; Robert Kagann; Chester Spicer; Michael Holdren; Howard T Mayfield; APPLIED RESEARCH ASSOCIATES INC TYNDALL AFB FL
|
| The Strategic Environmental Research and Development Program (SERDP) has initiated several programs to develop and evaluate techniques to characterize emissions from military aircraft, in order to meet increasingly stringent regulatory requirements. This paper describes the results of a recent field study using extractive and optical remote sensing (ORS) techniques to measure emissions from six F-15 fighter aircraft. Testing was performed between November 14 and 16, 2006 on the trim pad ... |
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| Miniature and Molecularly Specific Optical Screening Technologies for Breast Cancer |
Oct-2008 |
33 pages |
| Authors:
Nirmala Ramanujam; DUKE UNIV DURHAM NC
|
| The goal of this proposal is to harness the power of light to create miniature and molecularly specific optical technologies for breast cancer diagnosis and detection. The miniature technologies will leverage on millimeter scale silicon detectors and LEDs to make compact devices that can be used in a practical clinical setting for breast cancer detection. The features that will be exploited for optical detection/diagnosis of breast cancer will include the ... |
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| An Underwater Light Attenuation Scheme for Marine Ecosystem Models |
Oct-2008 |
12 pages |
| Authors:
ZhongPing Lee; Bradley Penta; Raphael M Kudela; Sherry L Palacios; Deric J Gray; Jason K Jolliff; Igor G Shulman; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Simulation of underwater light is essential for modeling marine ecosystems. A new model of underwater light attenuation is presented and compared with previous models. In situ data collected in Monterey Bay, CA. during September 2006 are used for validation. It is demonstrated that while the new light model is computationally simple and efficient it maintains accuracy and flexibility. When this light model is incorporated into an ecosystem model, the correlation ... |
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| Combining Satellite Ocean Color Imagery and Circulation Modeling to Forecast Bio-Optical Properties: Comparison of Models and Advection Schemes |
Oct-2008 |
17 pages |
| Authors:
Rebecca E Green; Richard W Jr; Dong S Ko; Tamara L Townsend; Robert A Arnone; Gould; Regina D Smith; Peter M Flynn; Brandon J Casey; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Remote sensing of ocean color provides synoptic surface ocean bio-optical properties but is limited to real-time or climatological applications. Many applications, including navy mission planning using electro-optical sensor performance models, would benefit from a forecast capability. To achieve this, we couple satellite imagery with numerical circulation models to provide short-term (24-48 hr) forecasts of bio-optical properties. These are first-order approaches; they do not account for any biogeochemical mechanistic processes (growth, ... |
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| SOA-Based Optical Logic Circuit Development and Demonstration |
30-Sep-2008 |
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| 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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| Photon Noise in Digital Holographic Detection |
01-Sep-2008 |
16 pages |
| Authors:
Joseph C Marron; COHERENT TECHNOLOGIES INC LOUISVILLE CO
|
| Digital holographic detection is used to measure coherent, complex-valued image or pupil-plane data. With the complex-valued data, one has access to a digital representation of the optical field and therefore can perform advanced functions such as three-dimensional imaging and correction of phase errors imparted by instrumentation or atmospheric turbulence. This paper contains a derivation of the signal to noise ratio specifically for digital holographic detection in the presence of photon ... |
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| Optical Properties of Closely Coupled Dilute Nitride Mid-Infrared InNSb Quantum Dots |
Aug-2008 |
5 pages |
| Authors:
J S Harris; S M Kim; F Hatami; H Yuen; A Chin; P Kung; ALABAMA UNIV TUSCALOOSA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We report the growth and characterization of a new dilute nitride, InNSb quantum dots embedded on both InAs and GaAs substrate. Strain induced, self-assembled quantum dots are grown using solid-source molecular beam epitaxy. For improved growth control, we developed a growth technique similar to atomic layer epitaxial methods. Nitrogen incorporation during formation of quantum dots changes surface energy barrier and causes anisotropic distribution of strain energy, results in formation of ... |
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| Many-Body Effects on Optical Carrier Cooling in Intrinsic Semiconductors at Low Lattice Temperatures |
11-Jul-2008 |
9 pages |
| Authors:
Danhong Huang; P M Alsing; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
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| Based on the coupled density and energy balance equations, a dynamical model is proposed for exploring many-body effects on optical carrier cooling not lattice cooling in steady state in comparison with the earlier findings of current-driven carrier cooling in doped semiconductors X. L. Lei and C. S. Ting, Phys. Rev. B 32, 1112 1985 and tunneling-driven carrier cooling through discrete levels of a quantum dot H. L. Edwards et al., ... |
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| A Nearby Old Halo White Dwarf Candidate from the Sloan Digital Sky Survey |
Jul-2008 |
8 pages |
| Authors:
Mukremin Kilic; Hugh C Harris; Patrick B Hall; Piotr M Kowalski; Akshay Awal; S K Leggett; Scott F Anderson; Evalyn Gates; NAVAL OBSERVATORY WASHINGTON DC
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| We report the discovery of a nearby old halo white dwarf (WD) candidate from the Sloan Digital Sky Survey (SDSS). SDSS J110217.48+411315.4 has a proper motion of 1'.75 yr-1 and redder optical colors than all other known featureless (type DC) WDs. We present SDSS imaging and spectroscopy of this object, along with near-infrared photometry obtained at the United Kingdom Infrared Telescope (UKIRT). Fitting its photometry with up-to-date model atmospheres, we ... |
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| Nanotechnology-Enabled Optical Molecular Imaging of Breast Cancer |
Jul-2008 |
93 pages |
| Authors:
Rebekah Drezek; RICE UNIV HOUSTON TX
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| This project focuses on development of nanotechnology-enabled optical molecular imaging technologies for applications in breast cancer diagnosis and monitoring of therapeutic response. The project consists of two major efforts: (1) optical instrumentation technology development and (2) development of complementary engineered nanomaterials for use in conjunction with the instrumentation created to provide molecular specificity. A particularly significant effort is underway to develop needle-compatible fiber optic probes to enable in vivo imaging ... |
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| Comparison and Validation of Point Spread Models for Imaging in Natural Waters |
20-Jun-2008 |
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| Authors:
Alan Weidemann; Robert Arnone; Weilin Hou; Deric Gray; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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| It is known that scattering by particulates within natural waters is the main cause of the blur in underwater images. Underwater images can be better restored or enhanced with knowledge of the point spread function (PSF) of the water. This will extend the performance range as well as the information retrieval from underwater electro-optical systems, which is critical in many civilian and military applications, including target and especially mine detection, ... |
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| Concurrent MR-NIR Imaging for Breast Cancer Diagnosis |
01-Jun-2008 |
71 pages |
| Authors:
Birsen Yazici; RENSSELAER POLYTECHNIC INST TROY NY
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| The primary objective of this research program is to investigate concurrent near infrared (NIR) optical and magnetic resonance (MR) imaging for breast cancer diagnosis. The NIR diffuse optical imaging offers novel criteria for cancer differentiation with the ability to measure (in vivo) oxygenation and vascularization state, the uptake and release of contrast agents and chromophore concentrations with high sensitivity. However, NIR diffuse optical tomography is inherently a low spatial resolution ... |
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