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Conference on advances in optical data storage technology

作者： Zhang, DG Wang, P Yang, J Tang, L Lu, YH Zhang, JY Ming, H Li, ZC Sun, YY Zhang, QJ Zhang, ZB Cao, L Univ Sci & Technol China Dept Phys Anhua 230026 Peoples R China

ISBN: (纸本)0819455989

We report the near-field investigation on azobenzene contained polymer films using scanning near-field optical microscopy. Nanometer scale dots and lines were inscribed on these films, and the topographies and transmitting images of these patterns could be obtained at the same time. The transmitting images were in agreements with the topographies, and it proved that trans-cis isomerization of the azobenzene moieties in the illuminated area induced both surface relief and anisotropy. The experimental results helped to discover the mechanism of the photo induced surface relief and anisotropy, and the agreement between the transmitting images and the topographies could be applied in pure optical writing/reading in high-density data storage.

关键词： scanning near field optical microscopy azobenzene polymer films photoinduced anisotropy surface deformation

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Consideration of code for multi-layer optical disk

Consideration of code for multi-layer optical disk

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Conference on advances in optical data storage technology

作者： Maeda, T Sugiyama, H Hitachi Ltd Storage Technol Res Ctr Totsuka Ku Yokohama Kanagawa 2440178 Japan

ISBN: (纸本)0819455989

Multi-layer recording method has been studied and developed since dual layer disk of D'VD-ROM and the studied disk type has expanded from ROM to Rewritable disk. Multi-layer disk has new problems different from a single layer disk. One is an inter-layer cross-talk, which a component of a signal from adjacent layer leaks into a detected signal when the information data is reproduced from a target layer. Second is a recording power fluctuation, which the light power reached a target layer changes by marks on intermediate layers. There were many works that solve this problem. This causes severe problem for signal processing and recording performance. There was work that was proposed to design the structure of a multi-layer disk and an optical head. In this paper, we reported the consideration of a code in order to solve the problems.

关键词： multi-layer DVD ROM inter-layer cross-talk code optical transfer function

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Electrochromism of photochromic diarylethene derivative

Electrochromism of photochromic diarylethene derivative

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Conference on advances in optical data storage technology

作者： Zhou, XH Pu, SZ Zhang, FS Zhao, FQ Liu, XD Xu, FY Fan, GF Tsinghua Univ Dept Chem Minist Educ Key Lab Organ Optoelect & Mol Engn Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

The diarylethene may undergo photochemical ring-closing reaction and both photochemical and electrochemical ring-opening reaction. Irradiation of the open form with UV light results in essentially quantitative photocyclization to the deeply colored form. The dithienylcyclopentene derivative in their ring-closed forms can undergo ring-opening upon electrochemical oxidation.

关键词： Absorption Electrodes Platinum Absorbance optical storage Molecules Oxidation Resistance Chemical species Ultraviolet radiation

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High-density, large-capacity, nonvolatile holographic storage in photorefractive crystals

High-density, large-capacity, nonvolatile holographic storag...

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Conference on advances in optical data storage technology

作者： Tao, SQ Jiang, ZQ Yuan, W Wan, YH Wang, Y Liu, GQ Wang, DY Ding, XH Jia, KB Beijing Univ Technol Coll Appl Sci Beijing 100022 Peoples R China

ISBN: (纸本)0819455989

The recent research on high-density, large-capacity, nonvolatile holographic storage in photorefractive crystals, carried out at Beijing University of technology, is reviewed in this paper. A batch thermal fixing technique was developed to overcome the volatility of a large number of multiplexed holograms, which has also proved to increase the effective dynamic range of crystals, hence to increase the storage density. The key of this technique is determination of the inter-batch optical erasure time constant that is much longer than the convenient (intra-batch) erasure time constant of the crystal. Disk-type storage is proposed to increase the degree of spatial multiplexing, so that the whole volume of the material can be used for storage, and the capacity increases remarkably. Incorporating batch thermal fixing into holographic disk storage yields to a track-division thermal fixing (TDTF) scheme for holographic disk storage to overcome the volatility of information and increase the storage density and capacity as well. Analyses and experimental results on a high density of 50 bits/mu m(2) (10 Gbits/cm(3)) show that high-density huge-capacity mass storage, indicated by storing 1 tera-bits or more data in a single crystal of reasonable size, can be achieved by means of TDTF holographic disk storage scheme.

关键词： holographic storage density capacity non-volatility batch-thermal fixing dynamic range image fidelity track-division thermal fixing disk-type storage

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data storage in Photorefractives Revisited

Data Storage in Photorefractives Revisited

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optical Computing 1988

作者： Redfield, Steve Hesselink, Lambertus Microelectronics and Computer Technology Corporation P.O. Box 200195 AustinTX78720 United States Stanford University Dept. of Aeronautics and Astronautics Durand Bldg. StanfordCA94034 United States

The results of a fresh look at holographic data storage in photorefractive materials is reported. This work concludes that advances in photorefractive material, particularly SBN, AO deflector technology, CCD technology, and laser technology could make a very interesting low latency mass storage device possible. Two advances in this technology, a technique for a highly asymmetric write/read cycle and a method for building artificial crystal shcipes, are described.

关键词： Virtual storage

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Ultra-high-density phase-change storage and memory

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NATURE MATERIALS 2006年第5期5卷 383-387页

作者： Hamann, HF O'Boyle, M Martin, YC Rooks, M Wickramasinghe, K TJ Watson Res Ctr Yorktown Hts NY 10598 USA

Phase-change storage is widely used in optical information technologies (DVD, CD-ROM and so on), and recently it has also been considered for non-volatile memory applications. This work reports advances in thermal data recording of phase-change materials. Specifically, we show erasable thermal phase-change recording at a storage density of 3.3 Tb inch(-2), which is three orders of magnitude denser than that currently achievable with commercial optical storage technologies. We demonstrate the concept of a thin film nanoheater to realize ultra-small heat spots with dimensions of less than 50 nm. Finally, we show in a proof-of-concept demonstration that an individual thin-film heater can write, erase and read the phase of these storage materials at competitive speeds. This work provides important stepping stones for a very-high-density storage or memory technology based on phase-change materials.

关键词： GE2SB2TE5 FILMS MICROSCOPE

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Three-dimensional optical storage recording by microexplosion in a doped PMMA polymer

Three-dimensional optical storage recording by microexplosio...

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Conference on advances in optical data storage technology

作者： Tang, HH Jiu, HF Jiang, B Cai, JW Xing, H Zhang, QJ Huang, WH Xia, AD Univ Sci & Technol China Dept Precis Machinery & Precis Instrumentat Hefei 230026 Peoples R China

ISBN: (纸本)0819455989

Three-dimensional optical data storage realized by microexplosion based on a multi-photon absorption process is a promising method to fabricate optical read-only memory with large recording capacity. The writing of multi-layered data bits inside a PMMA block doped with rare-earth ions (Sm3+ and Ce3+) under multi-photon absorption excited by a 800nm femtosecond (fs) pulsed laser was reported. The fs pulsed laser beam was focused into the sample with a microscope objective (N.A.= 0.65 40X), and bits were recorded as structurally altered regions which have high contrast in refraction index and fluorescence intensity. The recorded bits could be retrieved parallel by transmission using a conventional optical microscope or be read out serially by fluorescence signal of the structurally altered region excited by a 514.5nm laser using a reflect-type confocal microscope. Experimental results of three-dimensional recording and reading with 4-um in-plane bit spacing and 8-um inter-plane spacing in eight layers were presented. The structure changed in the material before and after the laser irradiation was discussed.

关键词： three-dimensional optical data storage multi-photon absorption a doped PMMA polymer femtosecond laser

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Error-correction codes for optical disc storage

Error-correction codes for optical disc storage

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Conference on advances in optical data storage technology

作者： Liu, X Jia, HB Ma, C Tsing Hua Univ Opt Memory Natl Engn Res Ctr Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

From CD to DVD to Blu-ray Disc, that optical disc all adopted the error-correction code to improve the storage. The error-correction code for the Blu-ray Disc, the up-to-the-minute optical disc, is more advanced than others. Many new technologies are applied in the Blu-ray Disc, especial the error-correction code which called Picket code is more powerful than RS and RSPC code. In the same condition, the error-code rate of the optical disc which used the Picket code is 1.5x10(-18), and the optical disc used RSPC is 5.7x10(-7). In this paper, the characteristic of those technologies which used in the optical disc will be discussed, include RS code used in CD system, RSPC code used in DVD system, and Picket code. Finally, it will add two different error matrixes to simulate the process of the error-correction code for the DVD system. In this simulating process, especially, we will compare the RS and RSPC code from mathematical direction in the simulation which is different from the professional comparison, this method can be easily accepted by beginner and the comparative result is very intuitionistic for freshman.

关键词： ECC code optical disc storage DVD system Blu-ray Disc mathematical simulation

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Status of international optical disk standards

Status of international optical disk standards

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Conference on Recent advances in Metrology, Characterization, and Standards for optical Digital data Disks

作者： Chen, D Neumann, J Chen & Associates Consulting Mound MN 55364 USA

ISBN: (纸本)081943292X

The authors wish to dedicate this paper to the late Mr. Patrick Sandell, the past Chairman of B11, whose stewardship of the optical disk standards activities in the past years produced much of the fruit which we will all enjoy. His leadership and contribution will be remembered for yeats to come. optical technology for data storage offers media removability with unsurpressed reliability. As the media are removable, data interchange between the media and drives from different sources is a major concern. The optical recording community realized, at the inception of this new storage technology development,that international standards for all optical recording disk/cartridge must be established to insure the healthy growth of this industry and for the benefit of the users. Many standards organizations took up the challenge and numerous international standards were established which are now being used world-wide. This paper provides a brief summary of the current status of the international optical disk standards.

关键词： optical recording international standards

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A new optical disk driver fine seek algorithm based on runout learning

A new optical disk driver fine seek algorithm based on runou...

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Conference on advances in optical data storage technology

作者： Chen, CH Yen, JY Natl Taiwan Univ Dept Mech Engn Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The eccentricity in the optical Disk Drive (ODD) is the inevitable deviation of the geometric center of circular tracks from the rotating center of the disk. The resulted "runout" in the drive is thus periodic with disk rotation. To overcome the runout, conventional approach is for the pick-up head to go forward to the target track while shaking with the period runout during track accessing. This paper proposes an integration of the learning algorithm to learn the runout motion with an on-line observer to estimate the track runout during track accessing. The purpose is to allow for online computation of the target track kinematics so that the controller can adjust the accessing strategy to accommodate for the target track behavior. The proposed algorithm is demonstrated to be feasible through experiments applied to the fine jump control for a general optical storage opto-mechenical-electrical-control plant from OES in ITRI.

关键词： optical disk drive runout learning algorithm fine seek

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