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Conference on advances in optical data storage technology

作者： Suzuki, Y Tanaka, S Nakatani, M Sumi, S Tanemura, S Sanyo Elect Co Ltd Digita Syst Technol Dev Ctr Gifu 5030191 Japan

ISBN: (纸本)0819455989

The Center Aperture Detection (CAD) type Magnetically Induced Super-resolution (MSR) Magneto-optical Disk is one of method to overcome the limitation of optical resolution. For a reliability of the disk, it is important to investigate the stability of the magneto-static coupling between a readout layer and a recording layer through readout characteristics. In this paper, we tested the reliability of CAD tMSR magneto-optical disk. We used iD PHOTO disk for the CAD MSR magneto-optical disk. In the disk, the data is recorded on land and groove with a track pit of 0.6 mu m and a bit length of 0.235 mu m, by a method of laser pumped magnetic field modulation with an optical pickup of NA=0.62, lambda-650 nm. The reliability was examined by PI error lines under the test condition of 80 degrees C-90 %RH. There were no considerable changes in read/write characteristics up to with an aging time of 2000 hour. The lifetime of the disk was estimated more than 7000 hour under the condition. By a method of the Arrhenius plots, we assumed that the lifetime of the disk would be more than 100 years under the condition of room temperature. We also confirmed that there were no significant changes in mechanical characteristics of the disks. These results show the disk using magnetostatic coupling has sufficient reliability for consumer use.

关键词： CAD MSR magneto-optical disk reliability magneto-static coupling high density recording

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A practical method of suppressing photovoltaic noise in Fe: LiNbO₃

A practical method of suppressing photovoltaic noise in Fe: ...

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Conference on advances in optical data storage technology

作者： Wan, YH Zhang, L Liu, GQ Tao, SQ Beijing Univ Technol Coll Appl Sci Beijing 100022 Peoples R China

ISBN: (纸本)0819455989

A practical method of suppressing photovoltaic noise in photorefractive iron doped lithium niobate crystals (Fe: LiNbO3) is proposed, in which the surfaces of the crystal are coated with transparent electric-conductive material (In2O3 doped stannum. ITO) forcing the crystal to operate in a short-circuit mode. In order to assess the validity of this method, the loss of signal-to-noise ratio (LSNR) was used to evaluate the quality of images formed directly through uncoated and ITO-coated crystals respectively Several iron doped lithium niobate crystals were measured. The main experimental results showed that the scattering noise decreased obviously in the ITO-coated crystals, suggesting that the short-circuit operation suppressed photovoltaic noise effectively. Furthermore, it is found that the dynamic range (M#) of the crystals increased after they were coated with ITO. ne results of experiments on multiple hologram recordings in the uncoated and ITO-coated Fe: LiNbO3 crystal verified the improvement of M# well.

关键词： holographic storage photorefractive crystal photovoltaic effect scattering noise short-circuit mode dynamic range

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Developing characteristics of Thermally Fixed holograms in Fe:LiNbO₃

Developing characteristics of Thermally Fixed holograms in F...

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Conference on advances in optical data storage technology

作者： Yang, R Jiang, ZQ Liu, GQ Tao, SQ Beijing Univ Technol Coll Appl Sci Beijing 10002 Peoples R China

ISBN: (纸本)0819455989

Thermal-fixing holographic storage in photorefractive crystals is an effective nonvolatile storage technique for stabilizing holograms against the optical erasure. The developing characteristics of fixed holograms in iron-doped lithium niobate dominate their final diffraction efficiencies after developing, provided that the ionic compensation in the fixing stage is nearly complete. Developing kinetics of fixed holograms under homogeneous illumination is studied. The effect of developing light intensity on developing efficiency has been demonstrated experimentally. The fixed holograms with the same initial recording grating strength are developed under illumination of the different light intensities, such as 200mW/cm(2), 400mW/cm(2), 600mW/cm(2). and 800mW/cm(2), respectively. The fixed holograms with the different initial recording grating strengths are developed under illumination of the same light intensities as well. The overdeveloping characteristics of fixed holograms are described. The developing efficiency of the hologram with a given initial recording grating strength is found to depend on the intensity of developing light. These features can be explained with the joint effect of the resulting space-charge holographic field of the fixed hologram and the photovoltaic field under homogeneous illumination.

关键词： volume holographic storage developing diffraction efficiency thermal fixing efficiency developing efficiency

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A new measuring method of vertical degree between pick-up and disc of DVD drive

A new measuring method of vertical degree between pick-up an...

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Conference on advances in optical data storage technology

作者： Huang, H Zhan, L Xie, C Huazhong Univ Sci & Technol Coll Comp Sci & Engn Natl Storage Syst Lab Wuhan 430074 Hubei Province Peoples R China

ISBN: (纸本)0819455989

Vertical degree of pick-up and disc is an important factor that influences reading and writing date in DVD drive. Measuring and adjusting vertical degree of pick-up and disc is a key working procedure in DVD drive manufacture. Now, measuring method in actual production is an indirect measuring, which measure parallel between spindle motor and traverse. It's not very accuracy as there are error in pick-up assembles, The paper suggests a new method to measure vertical degree of pick-up and disc, new method measure vertical degree of pick-up and disc directly. The key of new method is measure position of laser from pick-up. A specialty optical circuit and fine CCD camera is need. The CCD camera is responsibility for collection information of laser image of pick-up and sends information to a computer. The specialty software responsibility for calculating position of laser and calculating incline angle between pick-up and disc. Because of characteristic of DVD drive manufacture, the algorithm calculating position of laser image must be design for accuracy and quickness. The paper suggests a specialty algorithm to calculating position of laser image. The algorithm is very accuracy and quickly, it can measure 0.05-degree incline angle error. The new method is helpful to automatic adjusting technique vertical degree of pick-up and disc.

关键词： vertical degree position of laser DVD drive manufacture

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Silver particles dispersed silver oxide film: a dual function write once recording material

Silver particles dispersed silver oxide film: a dual functio...

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Conference on advances in optical data storage technology

作者： Chou, LH Chung, IC Hsu, PY Natl Tsing Hua Univ Dept Mat Sci & Engn Hsinchu 300 Taiwan

ISBN: (纸本)0819455989

Silver oxide thin-films with various silver oxides concentration and silver particles amounts are prepared via magnetron sputtering techniques with oxygen reactive gas by varying deposition parameters. The presence of silver particles in the inorganic silver oxide compound was detected by x-ray diffraction. Heat measurements of the powdered silver oxide film via thermogravimetry analyzer (TGA) show that the powdered silver oxide decomposes and releases oxygen at a temperature of about 355 degrees C. The oxygen concentration can be estimated by TGA weight loss. The optical reflectance and extinction coefficient of the silver oxide film confirm the dual function of the silver particles present in the film. The silver particles served both as the laser beam light absrober and reflectance centers for laser beam. With the presence of the silver particles in the silver oxide film, the reflective layer used in the prior art can be dispensed with. A single layer disk-silver dispersed silver oxide film, which served both as the recording layer and the reflective layer, deposited on the digital versatile disk-recordable (DVD-R) polycarbonate substrate is prepared. Since the plastic substrate is softened at a temperature of about 140 degrees C, the silver oxide recording layer decomposes and releases oxygen when the recording medium is irradiated with a laser beam so as to permit formation of recesses in the plastic substrate and so as to permit a sharp change in reflectivity at positions where the recessions are formed. The characteristics of this single layer DVD-R disk are demonstrated.

关键词： silver oxide thin-film write-once DVD-R optical disk

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Progress toward the commercial realization of high performance holographic data storage

Progress toward the commercial realization of high performan...

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Organic Holographic Materials and Applications III

作者： Curtis, K. Anderson, K. Fotheringham, E. Weaver, S. Ihas, B. Hill, A. Dhar, Lisa Wilson, William L. InPhase Technologies 2000 Pike Road Longmont CO 80501

The promise of using volume holography to deliver high performance optical storage systems is at hand. The possibility of extremely large storage capacities and fast transfer rates make holographic storage ideal for high performance video applications. An overview of advances at InPhase Technologies is presented. Progress toward high-density implementations as well as the development of a functional prototype is presented. These systems are the first fully functional holographic recordable drives developed. Their development paves the way for the commercialization of this technology.

关键词： data storage equipment

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Corrosion resistance of nitrogenated amorphous carbon films prepared by facing target sputtering

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SURFACE & COATINGS technology 2005年第1-3期198卷 437-440页

作者： Shi, JR Xu, YJ Zhang, J Data Storage Inst Singapore 117608 Singapore

Nitrogenated amorphous carbon (a-CNx) films were prepared by facing target sputtering (FTS) technique. The nitrogen content in deposited films determined by X-ray photoelectron spectroscopy (XPS) measurement increases from 0 to 19.6 at.% as N-2/Ar ratio varies from 0 to 0.4. Several sets of disks with a layer structure of AlMg substrate/CoCrPtB (30 nm)/a-CNx (2 nm) were prepared for accelerated environmental corrosion test. The corrosion spots on the disks are mainly located in the fourth quadrant in the Pq-Sq 2D histogram. Both the corrosion areas in the third and fourth quadrants have a similar trend, increasing with N content in the overcoats. Other techniques, such as Raman spectroscopy and ellipsometric spectroscopy, were used to characterize the a-CNx films deposited on silicon substrates. As N content increases, the G peak width decreases from 187 to 182 cm(-1), the I-D/I-G intensity ratio increases from 1.75 to 1.99, and the Tauc optical band gap decreases from 2.1 to 1.4 eV. Both Raman and ellipsometric results indicate that the sp(3) fraction of carbon atoms decreases with N content. This fact can result in a loose carbon network, which interprets the increase of corrosion spots on the surface of a-CNx films. (c) 2004 Elsevier B.V. All rights reserved.

关键词： corrosion nitrogenated amorphous carbon facing target sputtering

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MO‐B‐I‐618‐02: Overview of Digital Detector technology

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Medical Physics 2005年第6期32卷 2049-2049页

作者： Seibert, J. UC Davis Medical Center Sacramento CA United States

There are various technologies available for the acquisition and display of digital radiographic images. A division has historically existed between “computed radiography” (CR) using photostimulable storage phosphors placed in a cassette holder with subsequent processing in a reader, and “direct radiography” (DR) using a detector with integrated electronics and direct readout and image display. In 2005, these distinctions are less obvious, as some storage phosphor (PSP) devices are automated with direct image display, and some direct flat‐panel devices are used like a portable cassette. Generally speaking, rather than distinguishing digital detectors based on “CR versus DR”, consideration of cassette versus cassetteless digital radiography is perhaps warranted as the technology advances. Besides the venerable cassette‐based PSP detector and plate reader for large field of view imaging (35 × 43 cm), digital detector technologies now available include PSP line‐scan systems in a cassetteless enclosure, optically coupled CCD‐camera systems, fiber‐optically coupled slot‐scan CCD array detectors, indirect x‐ray conversion scintillators and thin‐film‐transistor (TFT) photodiode arrays, and direct x‐ray conversion semiconductors layered on TFT detector arrays. Dedicated digital mammography detectors use similar technologies, with appropriate tuning for resolution and speed. Detective quantum efficiency measurements, equipment specifications, unique acquisition techniques (e.g., digital tomosynthesis and dual energy radiography), PACS/RIS integration and quality control issues are reviewed in the presentation. Educational Objectives: 1. To describe digital radiography in general terms, and compare with screen‐film detectors 2. To understand acquisition and information flow of digital radiography devices 3. To compare cassette and cassetteless operation in terms of resolution, dose efficiency and signal to noise ratio 4. To describe new data acquisition and image processing t

关键词： Image sensors Digital radiography Radiography Scintillation detectors Medical imaging optical sensors Image detection systems Fiber optic devices Thin film transistors Phosphors

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E-beam proximity effect parameters of sub-100nm features

E-beam proximity effect parameters of sub-100nm features

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Conference on advances in Resist technology and Processing XXI

作者： Mountfield, K Eckert, A Yang, XM Johns, E Seagate Res Pittsburgh PA 15222 USA

ISBN: (纸本)0819452890

Understanding the proximity effect is crucial to fabricating repeatable sub-100 nm features for magnetic recording devices. Top down CD-SEM measurements have been used to measure the proximity effect parameters in negative and positive resists at dimensions below 100 nm. The goal of this work is to experimentally determine the values of the parameters alpha, beta and eta and what they depend on.

关键词： E-beam lithography proximity effect data storage thin film heads nanofabrication

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High performance 193nm photoresist materials based on ROMA polymers;sub-90nm contact hole application with resist reflow

High performance 193nm photoresist materials based on ROMA p...

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Conference on advances in Resist technology and Processing XXI

作者： Joo, HS Seo, DC Kim, CM Lim, YT Cho, SD Lee, JB Song, JY Kim, KM Park, JH Jung, JC Shin, KS Bok, CK Moon, SC Korea Kumho Petrochem Co Ltd Chungnam 336880 South Korea

ISBN: (纸本)0819452890

There are numerous methods being explored by lithographers to achieve the patterning of sub-90nm contact hole features. Regarding optical impact on contact imaging, various optical extension techniques such as assist features, focus drilling, phase shift masks, and off-axis illumination are being employed to improve the aerial image. One possible option for improving of the process window in contact hole patterning is resist reflow. We have already reported the resist using a ring opened polymer of maleic anhydride unit(ROMA) during past two years in this conference. It has several good properties such as UV transmittance, PED stability, solubility and storage stability. The resist using ROMA polymer as a matrix resin showed a good lithographic performance at C/H pattern and one of the best characteristics in a ROMA polymer is the property of thermal shrinkage. It has a specific glass transition temperature(Tg) each polymers, so they made a applying of resist reflow technique to print sub-90nm C/H possible. Recently, we have researched about advanced ROMA polymer(ROMA II), which is composed of cycloolefine derivatives with existing ROMA type polymer(ROMA 1), for dry etch resistance increasing, high resolution, and good thermal shrinkage property. In this paper, we will present the structure, thermal shrinkage properties, Tg control, material properties for ROMA H polymer and will show characteristics, the lithographic performance for iso and dense C/H applications of the resist using ROMA II polymer. In addition, we will discuss resist reflow data gained at C/H profile of sub-90nm sizes, which has good process window.

关键词： Polymers Etching Lithography Resistance Electroluminescence Glasses Monochromatic aberrations Photoresist processing Dry etching optical lithography

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