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Fast response organic light-emitting diode for visible optical communication

Fast response organic light-emitting diode for visible optic...

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conference on photonics Packaging, Integration, and Interconnects VIII

作者： Fukuda, Takeshi Taniguchi, Yoshio Fujikura Ltd Appl Elect Technol Dept Opt & Elect Lab 1440 Mutsuzaki Chiba 2858550 Japan Shinshu Univ Fac Text Sci & Technol Dept Funct Polymer Sci Ueda Nagano 3868567 Japan

ISBN: (纸本)9780819470744

We examined fast response organic light-emitting diodes (OLEDs) for new applications of visible optical communications. For the practical use in this field;the fast transmission speed of OLEDs is required to be used in many applications, but the low carrier mobility of organic materials and the long fluorescence lifetime (FL) of organic emitting materials limit the transmission speed of OLEDs. Therefore, we investigated the influence of the FL on transient properties of photoluminescence (PL), which were evaluated by the frequency dependence of PL intensity excited by a modulated violet laser diode. The FLs of several organic emitting materials were also measured, and we found the clearly relationship between the FL and the transient properties of PL intensity. The fastest cutoff frequency of PL intensity was achieved 160 MHz utilizing short FL material, 1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl]vinyl]benzene. We also investigated another way to increase the transmission speed utilizing a semiconductor-organic multilayer structure, of which ZnS was used as an electron transport layer. The maximum cutoff frequency of this device was achieved 20.3 MHz, while that of the organic multilayer structure was 8.7 MHz at a. sine wave voltage of 7 V and a bias voltage of 5 V. This result indicates that the high carrier mobility of the ZnS layer causes the increase in the transmission speed of OLEDs. We demonstrated one institutive demonstrator module of visible optical communications, which consisted of the transceiver module with an OLED and the pen-type receiver module with a photo-diode at a point. The movie files was transmitted at a speed of 230 kbps, when the point of a pen-type receiver module approaches the emitting area of an OLED. Furthermore, the pseudo-random signal with 1Mbps was also transmitted with this visible optical communication system. Such a system enables to connect between transceiver and receiver modules without precious alignment because of the large

关键词： organic light-emitting diode transmission speed fluorescence lifetime semiconductor-organic multilayer structure visible optical communication intuitive data input and output system

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Infrared imaging spectroscopic system based on a PGP spectrograph and a monochrome infrared camera

Infrared imaging spectroscopic system based on a PGP spectro...

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conference on Infrared Imaging systems - Design, Analysis, modeling, and Testing XIX

作者： Garcia-Allende, P. Beatriz Anabitarte, Francisco Conde, Olga M. Madruga, Francisco J. Lomer, Mauro Lopez-Higuera, Jose M. Univ Cantabria Photon Engn Grp E-39005 Santander Spain

ISBN: (纸本)9780819471321

Hyperspectral imaging spectroscopy has been widely used in remote sensing. However, its potential for applications in industrial and biological fields is enormous. Observation line spectrographs, based on the reflectance of the material under study in each field, can be obtained by means of an imaging spectrometer. In this way, imaging spectroscopy allows the simultaneous determination of the optical spectrum components and the spatial location of an object in a surface. A simple, small and low-cost spectrometer, such as those ones based on passive Prism-Grating-Prism (PGP) devices, is required for the abovementioned application fields. In this paper a non-intrusive and non-contact near infrared acquisition system based on a PGP spectrometer is presented. An extension to the whole near infrared range of the spectrum of a previously designed system in the Vis-NIR range has been performed. The reason under this investigation is to improve material characterization. To our knowledge, no imaging spectroscopic system based on a PGP device working in this range has been previously reported. The components of the system, its assembling, alignment and calibration procedures will be described in detail. This system can be generalized for a wide variety of applications employing a specific and adequate data processing.

关键词： hyperspectral system infrared imaging spectroscopy imaging spectrograph Prism-Grating-Prism device

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Verification of the James Webb Space Telescope (JWST) wavefront sensing and control system

Verification of the James Webb Space Telescope (JWST) wavefr...

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conference on Space Telescopes and Instrumentation 2008 - optical, Infrared and Millimeter

作者： Contos, Adam R. Acton, D. Scott Barto, Allison A. Burns, Laura A. Contreras, James Dean, Bruce Elliott, Erin Feinberg, Lee Hansen, Karl Hardy, Bruce Hayden, William Knight, J. Scott Lightsey, Paul A. Starr, Carl Sullivan, Joseph Ball Aerosp & Technol Corp POB 1062 Boulder CO 80306 USA Northrop Grumman Space Technol Redondo Beach 90277 CA USA NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA Space Telescope Sci Inst Baltimore MD 21218 USA

ISBN: (纸本)9780819472205

From its orbit around the Earth-Sun second Lagrange point some million miles from Earth, the James Webb Space Telescope (JWST) will be uniquely suited to study early galaxy and star formation with its suite of infrared instruments.([1]) To maintain exceptional image quality using its 6.6 meter segmented primary mirror, wavefront sensing and control (WFS&C) is vital to ensure the optical alignment of the telescope throughout the mission. After deployment of the observatory structure and mirrors from the "folded" launch configuration, WFS&C is used to align the telescope([2]), as well as maintain that alignment. WFS&C verification includes the verification of the software and its incorporated algorithms, along with the supporting aspects of the integrated ground segment, instrumentation, and telescope through increasing levels of assembly. The software and process are verified with the Integrated Telescope Model (ITM), which is a Matlab/Simulink integrated observatory model which interfaces to CodeV/OSLO/IDL. In addition to lower level testing, the Near-Infrared Camera ([3]) (NIRCam) with its wavefront sensing optical components is verified with the other instruments with a cryogenic optical telescope simulator (OSIM) before moving on to the final WFS&C testing in Chamber A at the Johnson Space Center (JSC) where additional observatory verification occurs.

关键词： James Webb JWST optical verification telescope integrated modeling wavefront sensing wavefront control WFS&C NIRCam cryogenic testing

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Cryogenic pupil alignment test architecture for the James Webb Space Telescope integrated science instrument module

Cryogenic pupil alignment test architecture for the James We...

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conference on Space Telescopes and Instrumentation 2008 - optical, Infrared and Millimeter

作者： Bos, Brent J. Kubalak, David A. Antonille, Scott R. Ohl, Raymond G. Hagopian, John G. Davila, Pamela S. Sullivan, Joseph Sanchez, Michael Sabatke, Derek Woodruff, Robert A. te Plate, Maurice Evans, Clinton Isbrucker, Victor Somerstein, Stephen Wells, Martyn Ronayette, Samuel NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA Ball Aerosp & Technol Corp Boulder CO 80306 USA Lockheed Martin Space Syst Co Denver CO 80201 USA European Space Agcy European Space Res & Technol Ctr NL-2200 AG Noordwijk Netherlands COM DEV Ottawa ON Canada Isbrucker Consulting Kawartha Lakes ON Canada Lockheed Martin Adv Technol Ctr Palo Alto CA 94304 USA Astron Technol Ctr Royal Observ Edinburgh Edinburgh Midlothian Scotland CEA Saclay Gif Sur Yvette France

ISBN: (纸本)9780819472205

The James Webb Space Telescope (JWST) is a space-based, infrared observatory designed to study the early stages of galaxy formation in the Universe. It is currently scheduled to be launched in 2013 and will go into orbit about the second Lagrange point of the Sun-Earth system and passively cooled to 30-50 K to enable astronomical observations from 0.6 to 28 mu m. The JWST observatory consists of three primary elements: the spacecraft, the optical telescope element (OTE) and the integrated science instrument module (ISIM). The ISIM Element primarily consists of a mechanical metering structure, three science instruments and a fine guidance sensor with significant scientific capability. One of the critical opto-mechanical alignments for mission success is the co-registration of the OTE exit pupil with the entrance pupils of the ISIM instruments. To verify that the ISIM Element will be properly aligned with the nominal OTE exit pupil when the two elements come together, we have developed a cryogenic pupil measurement test architecture to measure three of the most critical pupil degrees-of-freedom during optical testing of the ISIM Element. The pupil measurement scheme makes use of: specularly reflective pupil alignment references located inside of the JWST instruments;ground support equipment that contains a pupil imaging module;an OTE simulator;and pupil viewing channels in two of the JWST flight instruments. Current modeling and analysis activities indicate this measurement approach will be able to verify pupil shear to an accuracy of 0.5-1 %.

关键词： space telescope infrared optical engineering exit pupil cryogenic alignment

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Strong Photoluminescence at 1540 nm from Er-doped Amorphous Silicon Oxycarbide: A Novel Silicon Material for Photonic Applications

Strong Photoluminescence at 1540 nm from Er-doped Amorphous ...

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conference on Nanophotonic Materials V

作者： Gallis, Spyros Nikas, Vasileios Suhag, Himani Huang, Mengbing Kaloyeros, Alain E. IBM Microelect Semicond Res & Dev Ctr Hopewell Jct NY 12533 USA SUNY Albany Coll Nanoscale Sci & Engn Albany NY 12203 USA

ISBN: (纸本)9780819472502

The present investigators have previously reported on strong room-temperature luminescence at 1540 nm from erbium-doped amorphous silicon oxycarbide (a-SiCxOy:Er) thin films. An enhancement of similar to 20 times was found for as-grown SiC0.5O1.0:Er compared to SiO2:Er control samples under continuous wavelength (cw) pumping at 496.5 nm. Here, we report the effects of post-deposition annealing on the photoluminescence (PL) properties of Er-doped silicon oxycarbide. The amorphous SiCxOy films were grown by thermal chemical vapor deposition (TCVD) at 800 degrees C and post-deposition annealing was conducted in the temperature range 500-1100 degrees C. The thin films were then implanted with 260keV Er ions and subsequently annealed at 900 degrees C. Strong room-temperature photoluminescence around 1540 nm was observed, with efficient Er+3 ion excitation occurring for pumping wavelengths ranging from 460 nm to 600 nm. modeling of the power dependence of Er luminescence yielded an effective Er excitation cross-section about four orders of magnitude larger than that for a direct optical excitation of Er+3 ions. Additionally, Fourier transform infrared spectroscopy (FTIR) studies of post-deposition annealed samples revealed a strong correlation between the Er PL intensity and the C-O bond concentration in the materials. The work suggests a novel method for achieving efficient Er luminescence in Si-based materials through controlled engineering of the Si-C-O system.

关键词： Erbium photoluminescence silicon oxycarbide photonics excitation cross section lifetime

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Practical implementation of the complex wavefront modulation model for optical alignment - art. no. 66170N

Practical implementation of the complex wavefront modulation...

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conference on modeling Aspects in optical Metrology

作者： Lee, Hanshin Dalton, Gavin B. Tosh, Ian A. J. Kim, Sug-Whan Univ Oxford Dept Phys Astrophys Subdept Oxford England

ISBN: (纸本)9780819467591

We discuss the implementation of the complex wavefront modulation model in practical optical alignment procedures and present its interim results. This modulation model describes the relation between the alignment state and the wavefront of a system, both are expressed in mathematical complex quantities. It addresses the importance of the coupled inter-element alignment effect to the resultant system wavefront. We utilise this effect in order to extract the alignment state of a system from measured optical wavefronts. We demonstrate the method's practical applicability to the real optical alignment procedure by showing alignment simulations of a centered three-mirror system.

关键词： alignment wavefront multi-element system

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Failure prediction in monitoring and control systems using Bayesian networks - art. no. 66950U

Failure prediction in monitoring and control systems using B...

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conference on optics and photonics for Information Processing

作者： Bottone, Steven Stanek, Clay DataPath Inc Poway CA 92064 USA

ISBN: (纸本)9780819468437

Predicting failure in complex systems, such as satellite network systems, is a challenging problem. A satellite earth terminal contains many components, such high-powered amplifiers, signal converters, modems, routers, and generators, any of which may cause system failure. The ability to estimate accurately the probability of failure of any of these components, given the current state of the system, may help reduce the cost of operation. Probabilistic graphical models, in particular Bayesian networks, provide a consistent framework in which to address problems containing uncertainty and complexity. Measurable nodes of the Bayesian network correspond to states of measurable parameters in the system and unmeasurable nodes represent failure of various components. Nodes for environmental factors are also included. A description of Bayesian networks will be provided and a demonstration of inference on the Bayesian network, such as the calculation of the marginal probability of failure nodes given measurements and the maximum probability state of the system for failure diagnosis will be given.

关键词： Failure analysis Satellites Amplifiers Data modeling Control systems Antennas Complex systems Data analysis Data conversion Diagnostics

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Broad-band optical test bench (OPTISHOP) to measure MTF and transmittance of visible and IR optical components

Broad-band optical test bench (OPTISHOP) to measure MTF and ...

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conference on Infrared Imaging systems - Design, Analysis, modeling, and Testing XVIII

作者： Cabib, Dario Rahav, Amir Barak, Tamir CI Syst Ltd IL-10551 Ramat Gavriel Migdal Haemek Israel

ISBN: (纸本)9780819466655

CI systems has developed a new cost effective and modular optical Test Bench to measure Modulation Transfer Function (MTF) and transmittance of optical components in the Visible/Near Infrared (0.4-1.7 microns) and infrared (3 to 14 microns) spectral ranges (the OPTISHOP system). The optical design concept of the system allows the user to switch from MTF (on- and off-axis) to transmittance measurements, without need of optical alignment by the user. In addition, broad band sources are used for illumination, so that these optical properties can be measured in the whole relevant wavelength range of the components to be tested (usually visible and/or near infrared separately from the infrared range). Other lens measurements such as effective focal length can be made. Back focal length, distortion and field curvature are being developed. The system is based on the standard and proven CTS (Collimator Test system) product line of CI, which is made of reflective optics for wide wavelength coverage, and it is ruggedly built for use in the laboratory, production line or maintenance depot. An advantage of the CTS configuration is that the source-collimator assembly is enclosed in a robust mechanical envelope, which prevents accidental misalignements and breakage, optical misalignments due to environment temperature drifts, soiling of the optics, and easier system transportation. The system is described here, including calibration and validation techniques.

关键词： optical testing modulation transfer function measurements lens transmittance MTF of infrared and visible components

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Liquid crystal devices for photonics applications

Liquid crystal devices for photonics applications

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conference on Passive Components and Fiber-Based Devices IV

作者： Chigrinov, Vladimir G. Hong Kong Univ Sci & Technol Kowloon Hong Kong Peoples R China

ISBN: (纸本)9780819469441

Liquid crystal (LC) devices for photonics applications is a hot topic of research. Such elements begin to appear in photonics market. Passive elements for fiber optical communication systems (DWDM components) based on LC cells can successfully compete with the other elements used for the purpose, such as micro electromechanical (MEM), thermo-optical, opto-mechanical or acousto-optical devices. Application of nematic and ferroelectric LC for high speed communication systems, producing elements that are extremely fast, stable, durable, of low loss, operable over a wide temperature range, and that require small operating voltages and extremely low power consumption. The known LC applications in fiber optics enable to produce switches, filters, attenuators, equalizers, polarization controllers, phase emulators and other fiber optical components. Good robustness due to the absence of moving parts and compatibility with VLSI technology, excellent parameters in a large photonic wavelength range, whereas the complexity of the design and the cost of the device are equivalent to regular passive matrix LC displays makes LC fiber optical devices very attractive for mass production. We have already successfully fabricated certain prototypes of the optical switches based on ferroelectric and nematic LC materials. The electrooptical modes used for the purpose included the light polarization rotation, voltage controllable diffraction and fast switching of the LC refractive index. We used the powerful software to optimize the LC modulation characteristics. Use of photo-alignment technique pioneered by us makes it possible to develop new LC fiber components. Almost all the criteria of perfect LC alignment are met in case of azo-dye layers. We have already used azo-dye materials to align LC in superthin photonic holes, curved and 3D surfaces and as cladding layers in microring silicon based resonators. The prototypes of new LC efficient photonics devices are envisaged. Controllable ph

关键词： liquid crystals fiber optical devices switches modeling software photoaligment photonic crystal

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Three-dimensional diffractive micro- and nano-optical elements fabricated by electron-beam lithography

Three-dimensional diffractive micro- and nano-optical elemen...

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conference on Micromachining Technology For Micro-optics and Nano-optics V and Microfabrication Process Technology XII

作者： Divliansky, Ivan B. Johnson, Eric G. Univ Cent Florida Coll Opt & Photon Orlando FL 32816 USA Univ N Carolina Elect & Comp Engn Charlotte NC 28223 USA

ISBN: (纸本)9780819465757

The broad development of the micro- and nano-technologies in the past few years increased the need of techniques capable of fabricating sub-micron structures with arbitrary surface profiles. Out of the several fabrication approaches (HEBS lithography, laser writing, etc.) the electron beam writing stands out as the one capable of the highest resolution, superior alignment accuracy and very small surface roughness. These characteristics make the technique greatly applicable in the fields of photonics and micro-opto-electro-mechanical-systems (MOEMS). Here we describe the specificity of fabricating 3D diffractive micro- and nano-optical elements using Leica EBPG 5000+ electron beam system. Parameters like speed of writing, dose accumulation, pattern writing specifics, etc. affect greatly the electron-beam resist properties and the desired 3D profile. We present data that can be used to better understand the different dependencies and therefore achieve better profile and surface roughness management. The results can be useful in future developments in the areas of integrated photonic circuits and MOEMS.

关键词： electron-beam lithography analog lithography grey lithography three-dimensional nano-fabrication nano-optics diffractive optics

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