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Sol-Gel and Polymer Photonic Devices: A Critical Review 1997

作者： Sekkat, Zouheir Knoesen, Andre Knoll, Wolfgang Miller, Robert D. Department of Electrical and Computer Engineering University of California DavisCA95616 United States Max -Planck -Institut Für Polymerforschung Ackermannweg 10 Mainz55128 Germany Frontier Research Program Wako Saitama351-01 Japan IBM Research Center Science and Technology 650 Harry Road San JoseCA95120-6099 United States

We review our recent research in the field of photochromic polymeric structures for optical data storage and nonlinear optics. We unify some of the sub -Themes of azopolymer structures in the light of photo -induced movement of azobenzene molecules. In particular, we discuss photo- induced effects in supramolecular assemblies containing azobenzene molecules (e.g. Langmuir- Blodgett -Kuhn structures and ultrathin silane layers). Reorientation of azobenzenes in these structures will be compared to that observed in spin -cast films. Photoisomerization and photo- induced orientation of azobenzene molecules is also studied at the molecular level by means of azosilane molecules chemisorbed on Silicon Oxide substrates. We establish a correlation between polymer architecture and sub -glass transition temperature (Tg) light- induced molecular movement in high Tg nonlinear optical azo- polyimide polymers. We show that the isomerization reaction itself depends on the polymer molecular structure, and we present evidence of light- induced molecular movement 325 °C below Tg of a rigid NLO azopolyimide polymer containing no flexible connector or tether. © (1997) 2017 SPIE.

关键词： Self assembled monolayers

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Operational systems, logistics engineering and technology insertion

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

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Three-dimensional computation of light scattering from cells

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IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 1996年第4期2卷 898-905页

作者： Dunn, A RichardsKortum, R Biomedical Engineering Program Department of Electrical and Computer Engineering University of Technology Austin TX USA

Using the finite-difference time-domain method, three-dimensional scattering patterns are computed for cells containing multiple organelles. The scattering cross section and average cosine of the scattering angle are computed for cells as a function of volume fraction of melanin granules and mitochondria, Results show that small organelles play a significant role in light scattering from cells, and the volume fraction of organelles affects both the total amount of scattered light and the angular distribution of scattered light.

关键词： Light scattering Optical scattering Mie scattering Electromagnetic scattering Cells (biology) Optical refraction Finite difference methods Time domain analysis Biomedical optical imaging High-resolution imaging

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Room-temperature performance of double-fused 1.54 /spl mu/m vertical-cavity laser

Room-temperature performance of double-fused 1.54 /spl mu/m ...

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Indium Phosphide and Related Materials Conference

作者： D.I. Babic K. Streubel R.P. Mirin J. Piprek N.M. Margalit J.E. Bower E.L. Hu D.E. Mars L. Yang K. Carey Department of Electrical and Computer Engineering University of California Santa Barbara USA Department of Electronics Royal Institute of Technology Stockholm Sweden Materials Science Program University of Delaware Newark USA Hewlett Packard Laboratories Palo Alto CA USA

The progress in understanding wafer-fused vertical-cavity lasers and improvements in fabrication techniques have led to the realization of the first room-temperature continuous-wave operating 1.54-/spl mu/m vertical-cavity lasers. By demonstrating continuous-wave operation at room temperature using vertical-cavity lasers fabricated by two wafer fusion steps, we have shown that wafer fusion is a viable technique. The lasers comprise strain compensated InGaAsP quantum-well active layers sandwiched between two AlGaAs/GaAs quarter-wave mirrors. Characteristics discussed include cavity losses, the gain-current density relationship, and voltage-current characteristics.

关键词： Vertical cavity surface emitting lasers Mirrors Optical pulse generation Absorption Pulse measurements Quantum well lasers Doping Temperature Propagation losses Size measurement

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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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Observability of a Specially Structured Model

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Journal of Vibration and Control 1995年第4期1卷 493-499页

作者： Ansary, Omid Electrical and Computer Engineering Technology Program Pennsylvania State University Middletown PA 17057 United States

The theorems associated with the observability matrices and gramians play a crucial role in both analysis and design of control systems. This paper presents the development of these theorems and their proofs in the context of a computationally attractive system model. This is accomplished by incorpo rating the structural properties of the model into the theorems that are found in the literature. The developed theorems lead to a generalized form of the Liapunov equation. An analytical solution for this equation is also presented. Finally, an example is given to illustrate the application of the proposed theorems. © 1995, Sage Publications. All rights reserved.

关键词： analysis descriptor-like model generalized Liapunov equation generalized observability gramian Generalized observability matrix

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Balancing Model Order Reduction Technique for Descriptor-Like Systems

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Journal of Vibration and Control 1995年第4期1卷 481-491页

作者： Ansary, Omid Electrical and Computer Engineering Technology Program Pennsylvania State University at Harrisburg Middletown PA 17057-4898 United States

This paper presents the balancing model order reduction technique in the context of a descriptor- like system representation, which exhibits special structural properties. This is done by integration of these properties into the conventional balancing model order reduction method. An example is given to illustrate the tractability and the application of the proposed technique. © 1995, Sage Publications. All rights reserved.

关键词： balanced coordinate Balancing model order reduction technique descriptor-like system generalized controllability and observability gramians

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An algorithm for computation of state variable feedback gain

An algorithm for computation of state variable feedback gain

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IEEE International Symposium on Intelligent Control (ISIC)

作者： O. Ansary Electrical and Computer Engineering Technology Program Pennsylvania State University Middletown PA USA

In this paper an algorithm for computing the state variable feedback gain is presented. The proposed algorithm is developed in the context of a generalized state feedback controller design method that exhibits a compu... 详细信息

关键词： State feedback Gain Equations Control systems Eigenvalues and eigenfunctions Algorithm design and analysis Polynomials Electric variables control Design methodology Transient response

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Observer design of control systems with descriptor-like model

Observer design of control systems with descriptor-like mode...

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Northcon

作者： O. Ansary Electrical and Computer Engineering Technology Program Pennsylvania State University Harrisburg Middletown PA USA

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Six tutorial computer modules for non-linear circuit analysis and design

Six tutorial computer modules for non-linear circuit analysi...

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Frontiers in Education (FIE) Conference

作者： J.G. Harris B. Black Computer Engineering Program Cal Poly San Louis Obispo CA USA Electrical and Computer Engineering Rose Hulman Institute of Technology Terre Haute IN USA

Six computer assisted instruction modules are available on the Internet that provide tutorials and demonstrations for nonlinear circuit analysis and design. These modules introduce the student in a sequence to the concept of a nonlinear two terminal device (one port) and its analysis and of a nonlinear three terminal device (two port) and its analysis. In addition, through interactive, graphics driven animation, the user can be provided with experience in the design of circuits with these nonlinear devices. The specific devices presented to illustrate these concepts are the pn diode and the bipolar junction transistor; there are three modules available for each. These modules are available on the Internet, either by anonymous FTP or through the auspices of NEEDS, the National engineering Education Delivery System, being developed by the NSF SYNTHESIS engineering Education Coalition.

关键词： Tutorial Circuit analysis computing Internet engineering education computer aided instruction Nonlinear circuits Circuit analysis Graphics Animation Diodes

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