| Embedded Millimeter Wave Photonic Crystals as Processing Elements in Shipboard Superstructures |
JUL 2007 |
13 pages |
| Authors:
Dennis W. Prather; DELAWARE UNIV NEWARK
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 | The ability to rapidly and accurately detect signals is essential in the modern warfare environment. However, the ever increasing use of the spectrum places great demand on current technology and, requires significant technological developments to overcome current limitations. Also, the nearly ubiquitous miniaturization of military systems requires a concomitant reduction in the size of radiating apertures. Therefore, in order to deal with these challenges, advanced artificial materials are used, namely, ... |
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| Optoelectronic Circuits Using 2D and 3D Self-Collimation Photonic Crystals |
JUL 2007 |
50 pages |
| Authors:
Dennis W. Prather; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| In our effort to develop and demonstrate the design, fabrication, and experimental characterization of self-collimation photonic crystal devices (SCPhCs) in both 2D and 3D structures, we identified various tasks and goals towards achieving the proposed applications. Two-dimensional self collimation photonic crystal structures will be used for in-plane optical signal distribution and routing while three-dimensional structures will be used for out-plane signal distribution, to provide high-density optically interconnected optoelectronic PhC circuits ... |
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| Miniaturized Antennas for Compact Soldier Combat Systems |
NOV 2006 |
7 pages |
| Authors:
Iftekhar O. Mirza; Shouyuan Shi; Christian Fazi; Joseph N. Mait; Dennis W. Prather; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| We simulate miniature loop and patch antennas with reactive elements embedded in the substrate of the antenna. To lower the antenna's effective resonant frequency and reduce the physical size of the antenna, we considered split-ring resonators (SRRs) as the antenna's inductive substrate material. Simulation results indicate a size reduction of up to thirty-eight percent is possible using this technique. |
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| Passive Synthetic Aperture Array Imaging at Millimeter Wave Frequencies using Novel Electro-optical Detection and Processing |
31 OCT 2006 |
39 pages |
| Authors:
Dennis W. Prather; Mark Mirotznik; DELAWARE UNIV NEWARK
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| In this effort we have designed, fabricated, and demonstrated a one-dimensional synthetic aperture imaging system for the passive imaging of millimeter waves (MMWs) using optical upconversion and correlation techniques. The advantage of this approach over alternate techniques is that the proposed system does not require expensive high-speed electronic detection and read out circuits and it is light enough to be used on UAV platforms. This technique eliminates the need for ... |
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| Dispersion Based Photonic-Crystal Structures for RF Applications |
JUN 2006 |
40 pages |
| Authors:
Dennis W. Prather; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This work provides a framework for establishing dielectric-based naval communication systems, which are more secure and more efficient, compared to current metallic counterparts. Herein are demonstrated applications of RE PhCs in improving the performance of naval communication systems and decreasing scattering cross-section of naval vessels. Dielectric devices were designed, fabricated, and characterized based on the unique dispersion properties of PhCs to achieve confinement, waveguiding, radiation, and filtering in the microwave ... |
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| Three-Dimensional Nano-Lithography for Emerging Technologies |
27 SEP 2005 |
11 pages |
| Authors:
Dennis W. Prather; DELAWARE UNIV NEWARK
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| Grayscale lithography has shown particular success in the pursuit of surface machining capabilities because of the flexibility and convenience it offers in the fabrication of arbitrary three-dimensional surfaces. Accordingly, grayscale lithography has been demonstrated for a wide range of applications, including refractive and diffractive optical elements for focusing and beam shaping, optical interconnects, and MEMS. While our original motivation for this research area was the fabrication of three different micro-optical ... |
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| Passive Synthetic Aperture Array Imaging at Millimeter Wave Frequencies |
09 SEP 2005 |
29 pages |
| Authors:
Dennis W. Prather; Mark Mirotznik; DELAWARE UNIV NEWARK
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| In this effort we investigated the design of synthetic aperture imaging systems for passive imaging of millimeter waves (MMWs) using a novel nano-photonic detector array. The idea is to demonstrate a lightweight and low power MMW imaging system with the highest possible resolution. To increase resolution we investigated the use of a "lensless" interferometric imaging system that is created by placing a sparse array of electro-optical MMW detectors along the ... |
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| Efficient Spatial Image Separator |
31 MAR 1998 |
34 pages |
| Authors:
Hal L. Levitt; Dennis W. Prather; Edward Gill; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A spatial image separator includes a separating arrangement that separates an incident image pattern into a plurality of segments. The spatial image separator additionally includes a manner of relocating and selectively of the segments toward at least one output position. This is accomplished in a manner which preserves information content while significantly improving energy utilization. |
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