3D opticaldatastorage can benefit from the non-linear process of two-photon absorption (TPA). If some chromphores with large TPA cross section are introduced into the diarylethene to enhance its two-photon absorptiv...
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ISBN:
(纸本)0819455989
3D opticaldatastorage can benefit from the non-linear process of two-photon absorption (TPA). If some chromphores with large TPA cross section are introduced into the diarylethene to enhance its two-photon absorptivities, it is expected to be good recording media for 3D opticaldatastorage. The authors have synthesized four diarylperfluorocyclopentene (DPFCP) derivates for the purpose of developing two-photon 3D opticaldatastorage. The nonlinear two-photon absorption (TPA) properties of the compounds were examined, and the reaction and excited state relaxation dynamics after two-photon excitation were investigated. The TPA cross sections of 2-position DPFCPs were measured by means of TPIF (two-photon induced fluorescence) method, and the highest is 48 x 10(-50) cm(4.)s(.)photo(-1.)molecule(-1). The compounds were successfully applied in two-photon 3D opticaldatastorage based on single beam two-photon femtosecond writing and one-photon fluorescence reading. Ten-layer clear images on DPFCP/PMMA film were obtained, and the datastorage density is high to 2.0 - 10(11) bits/cm(3).
In the past few years considerable demand has developed for oceanic datastorage system that are able to store Petabytes data. Volume holographic recording has the potential to offer high density, fast data readout ra...
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ISBN:
(纸本)0819455989
In the past few years considerable demand has developed for oceanic datastorage system that are able to store Petabytes data. Volume holographic recording has the potential to offer high density, fast data readout rate, and associative content addressable storage as compared with other conventional mass datastoragetechnology. However, its total cost and size impedes to go into market. If the volume holographic device could join network and be shared by more and more customers, the average cost for each customer should be reduced. On the other hand, the growing network storage technologies shake off the traditional storage architecture (DAS) limit including physical topologies and access mode, and provide high scalability, availability and flexible for storage system, moreover are widely applied to many fields. Obviously, it is valuable for building network storage device based on volume holographic. In this paper, we design the architecture and relative software of volume holographic device to enable common storage network, which can support the SAN based on Fibre channel and iSCSI. Our experiment shows the HSD (Holographic storage Device) has excellent performance for network storage.
Following the development of the opticaldatastoragetechnology, an important issue of reliability should also be paid attention to. The designing core of the reliability test way is, simulating the users' circum...
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ISBN:
(纸本)0819455989
Following the development of the opticaldatastoragetechnology, an important issue of reliability should also be paid attention to. The designing core of the reliability test way is, simulating the users' circumstance and the transporting process. The normal simulating is important but the users' playing situation is extreme irregular. So the normal simulating is not enough for reflecting the virtual operating status. Few long time playing experiments have been done previously. In fact such kind of long time playing experiment is most similar to the users' playing situation, and the effect is compositive since such playing is influenced by current surges, electrostatic discharges, even dust. It seems simple but it is important. We use the optical pickup heads to make sets to play DVD disc continuously for long time, and monitor the image and effect regularly. In our experiment, the optical pickup heads have operated continuously for 6000 hours. It suggests that such kind of long time playing as an additional reliability testing means is necessary, especially for the DVD player's manufacturing company.
Total internal reflection holography has been demonstrated as a technique for submicrometer lithography: A prototype system is described which is capable of printing 0.3-mu-m features over a very large field. Applicat...
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Total internal reflection holography has been demonstrated as a technique for submicrometer lithography: A prototype system is described which is capable of printing 0.3-mu-m features over a very large field. Applications in IC, display, and opticaldatastorage technologies are discussed.
A calorific equilibrium equation is used to derive the relativities of optimum recording power and pulse waveform parameters in various disc scanning velocities. Based on the model, a new recording parameters calibrat...
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ISBN:
(纸本)0819455989
A calorific equilibrium equation is used to derive the relativities of optimum recording power and pulse waveform parameters in various disc scanning velocities. Based on the model, a new recording parameters calibrating flow is given as a referenced process. A number of optical recording examples have been examined in detail, and the results have been compared with those calculated data by use of a general summation approach.
Nonlinear optics is given increasing attention due to its wide application in the area of laser technology, optical communication and datastoragetechnology. The growth of activities on NLO properties of nanomaterial...
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Nonlinear optics is given increasing attention due to its wide application in the area of laser technology, optical communication and datastoragetechnology. The growth of activities on NLO properties of nanomaterials, proposed by the agitation of understanding new science and potential hope for applications in daily life as optical devices, photonic circuits, and environmental sensor as well as in medical diagnostics. Intense research has been fueled by the need for practical optical device that can deal the deficiencies of conventional technologies. The leading materials could have very high bulk second order NLO values well beyond those available today, which in turn would enable optical switches and modulators of smaller dimensions than what is currently available, while at the same time substantially reducing the cost of fabrication of electrooptic (EO) devices. This paper mainly focus on recent advances in second and third order NLO properties of nanomaterials and understanding new science behind the extraordinary NLO values of nanomaterials. It also discusses about the development of nanomaterial based opticaltechnology.
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 following is a historical perspective of the significant technological demonstrations that shaped the history of high power semiconductor lasers, This article is not meant to be a re view article, as there are muc...
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The following is a historical perspective of the significant technological demonstrations that shaped the history of high power semiconductor lasers, This article is not meant to be a re view article, as there are much better review articles and reviewers available, nor would the article try to cover all of the contributions to such a rich technology. Nonetheless, this article will, anecdotally, present a perspective on the technological advances that resulted in the enabling technology of high power semiconductor lasers for applications such as fiber optic communications, datastorage, and material processing.
The optical properties of the Ce:Cu:LiNbO3 co-doped with different concentrations of In were measured, including absorption spectra, infrared transmittance spectra and holographic storage properties. The doped thresho...
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ISBN:
(纸本)0819455989
The optical properties of the Ce:Cu:LiNbO3 co-doped with different concentrations of In were measured, including absorption spectra, infrared transmittance spectra and holographic storage properties. The doped threshold of In was determined via the results of spectrum measurement. When the doped concentration of In is over its threshold, the photo-damage resistance ability of In:Ce:Cu:LiNbO3 is improved dramatically. In the measurement of holographic storage properties, the response time of 34s, diffraction efficiency of 33%, and exponential gain coefficient of 18cm(-1) were obtained for In(3mol%):Ce(0.20wt%):Cu(0.015wt%):LiNbO3 crystal.
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.
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