A description is given of some of the history, general principles and current embodiments of the technology of datastorage and retrieval by optical means. It also discusses the utility of some of these embodiments in...
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A description is given of some of the history, general principles and current embodiments of the technology of datastorage and retrieval by optical means. It also discusses the utility of some of these embodiments in certain classes of application.
advances in sensor technology, electronic devices, digital processing hardware, and computation systems have vastly increased the volume of data available for collection at scientific research sites. The Starfire Opti...
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ISBN:
(纸本)0769519148
advances in sensor technology, electronic devices, digital processing hardware, and computation systems have vastly increased the volume of data available for collection at scientific research sites. The Starfire optical Range of the Air Force Research Laboratory Directed Energy Directorate is responsible for the research and development of advanced techniques for atmospheric compensation for large telescopes. Recent experiments have been completed which encompassed more that 100TB of collected data. The collection, processing, archival, and analysis of these data required an entirely new approach for the facility staff. This paper presents the architecture, hardware and software components, integration difficulties, and performance results in a "lessons learned" format focused on specific implementation choices, interoperability lessons and issues, and results and capabilities.
Two photochromic fulgides, 3-[2-(N, N-dimethylaniline)-5-methyl-xazolemethylene]-4-isopropylidenetetrahydrofuran-2, 5-dione (A) and 3-(1,2-dimethyl-5-phenyl-pyrrolmethylene)-4-isopropylidenetetrahydrofuran-2, 5-dione ...
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ISBN:
(纸本)0819455989
Two photochromic fulgides, 3-[2-(N, N-dimethylaniline)-5-methyl-xazolemethylene]-4-isopropylidenetetrahydrofuran-2, 5-dione (A) and 3-(1,2-dimethyl-5-phenyl-pyrrolmethylene)-4-isopropylidenetetrahydrofuran-2, 5-dione (B), doped in PMMA as candidates of dual-wavelength optical memory for parallel recording are demonstrated. With 488nm-laser and 650nm-laser, both "cross" and "star" images are recorded on the same place of the sample and readout. Cross-talk between two fulgide compounds in PMMA matrix is also investigated.
作者：
Wang, JHong, TTsinghua Univ
Dept Precis Instruments State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China
Near-field optical recording based on solid immersion lens (SIL) system has attracted much attention in the high-density storage in recent years. The recording spot size can be decreased using the SIL effectively. The...
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ISBN:
(纸本)0819455989
Near-field optical recording based on solid immersion lens (SIL) system has attracted much attention in the high-density storage in recent years. The recording spot size can be decreased using the SIL effectively. The SIL near-field opticalstorage has advantages of high density, mass storage capacity and compatibility with man), technologies well developed. We have set up a SIL near-field static recording system. The experimental result with recording spot size 200 rim is presented. The influence factors in SIL near-field recording system are also discussed in the paper. Near-field optical virtual probe (NFOVP) is a kind of virtual probe by the evanescence wave interference and aperture diffraction based on SIL. It has a great potential in near-field opticaldatastorage. In this paper, the most important characteristics of the NFOVP has been revealed through numerical simulation. The FWHM of central peak, the size of near-field virtual probe is constant whatever the distance increases in a certain range so that the critical nano-separation control in the SIL near-field datastorage system can be relaxed. A realization model of NFOVP based on SIL system for datastorage has been proposed and the simulation result based on this model is presented.
The substantial amount of data generated every second in the big data age creates a pressing requirement for new and advanced datastorage techniques. Luminescent nanomaterials (LNMs) not only possess the same optical...
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The substantial amount of data generated every second in the big data age creates a pressing requirement for new and advanced datastorage techniques. Luminescent nanomaterials (LNMs) not only possess the same optical properties as their bulk materials but also have unique electronic and mechanical characteristics due to the strong constraints of photons and electrons at the nanoscale, enabling the development of revolutionary methods for datastorage with superhigh storage capacity, ultra-long working lifetime, and ultra-low power consumption. In this review, we investigate the latest achievements in LNMs for constructing next-generation datastorage systems, with a focus on opticaldatastorage and optoelectronic datastorage. We summarize the LNMs used in datastorage, namely upconversion nanomaterials, long persistence luminescent nanomaterials, and downconversion nanomaterials, and their applications in opticaldatastorage and optoelectronic datastorage. We conclude by discussing the superiority of the two types of datastorage and survey the prospects for the field.
Recent advances in reversible opticalstorage materials compatible with low-cost semiconductor lasers have led to experiments on high-areal-density high-data-rate opticalstorage of digital data. The results of these ...
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Recent advances in reversible opticalstorage materials compatible with low-cost semiconductor lasers have led to experiments on high-areal-density high-data-rate opticalstorage of digital data. The results of these experiments indicate that areal-densities of 10**8 bits/in**2 (1. 6 multiplied by 10**7 bits/cm**2) and data-rates from 10-25 Mbits/sec appear feasible. This, together with an improved high-track-density beam servo scheme, allows a high-capacity (1G Byte/surface) optical file to be configured using 14 inch diameter disk technology.
The non-linearity of the super-RENS mask can be used in opticaldatastorage, which can greatly increase the disk's density. Experiment is carried on the traditional mastering system with modification. We adopt th...
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ISBN:
(纸本)0819455989
The non-linearity of the super-RENS mask can be used in opticaldatastorage, which can greatly increase the disk's density. Experiment is carried on the traditional mastering system with modification. We adopt the SiN/Sb/SiN multiplayer as the mask to insert the optical mask. For 413nm semiconductor laser and lens with NA=0.9, the diffraction limit is 200nm theoretically. Mark-120nm much smaller than that size is generated in the experiment. The thickness of Sb in the mask layers has much effect on the mastering signal intensity. For different power, we should control the thickness of Sb film. The experiments results show that the super-RENS mask can actually reduce the size of the mark obviously and realize the high density opticalstorage.
The servo control of the DVD optical head with tilt control is often difficult because of the coupled effect between the fine tracking servo and die tilt angle servo. Experiences show that the control system character...
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ISBN:
(纸本)0819455989
The servo control of the DVD optical head with tilt control is often difficult because of the coupled effect between the fine tracking servo and die tilt angle servo. Experiences show that the control system characteristics changes with different tilt angle. The controller may have to adapt for the characteristic change. This study presents a model to represent the changes in the system dynamics with respect to the different tilt angle. The variation in the dynamic behavior can than be lumped into a multiplicative system uncertainty. A mu-control synthesis procedure is then shown to be an effective servo design tool.
In this paper, diarylethene derivative, 1,2-bis(2-methyl-5-N,N-dimethylaminophenyl)-thien-3-yl) perfluorocyclopentene (BMDTP) was synthesized. And the PMMA film of 10 mu m thickness of BMDTP was fabricated by spin-coa...
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ISBN:
(纸本)0819455989
In this paper, diarylethene derivative, 1,2-bis(2-methyl-5-N,N-dimethylaminophenyl)-thien-3-yl) perfluorocyclopentene (BMDTP) was synthesized. And the PMMA film of 10 mu m thickness of BMDTP was fabricated by spin-coating method. The maximal UV-Visible absorption of amorphous PMMA film is 634nm. And the reflective index modulation(Delta n) is 2.14 X 10(-3) between the open- and close-rings form. On the PMMA film, ten gratings of hologram are recorded in one volume by angle multiplexing. Therefore, the diarylethene is a promising material for rewritable volume holographic opticalstorage.
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 photocy...
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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.
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