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1995 Topical Meeting on optical data storage

作者： COVAULT, M HEWLETT PACKARD CORP DIV DISK MEMORYBOISEID 83714

advances in hard disk magnetic recording technology are accelerating the increase in areal density. With the advent of MR heads and PRML channels, the drive industry is doubling the capacity of high performance driver... 详细信息

ISBN: (纸本)0819418730

关键词： DISK DRIVES COST/MB MR PRML AREAL DENSITY DUAL STRIPE MR GMR

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Temperature gradient study on the hybrid Recording

Temperature gradient study on the hybrid Recording

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Conference on advances in optical data storage technology

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

ISBN: (纸本)0819455989

The paper suggests a new scheme of hybrid recording by high refractive index optical waveguide;analyzes the waveguide exit optical field and the near field optical spot energy distribute of the hybrid recording medium surface. We succeed to use the Maxwell electromagnetism theory to model and simulate the waveguide exit energy distribute, obtained the near field optical spot of the hybrid recording medium surface. According to energy balance way, a new model has been adopted and the hybrid recording medium temperature gradient has been studied. The Thermal modeling of two-dimensional transient temperature distributed by the finite element method is studied;with this tool, the hybrid recording medium temperature gradient has been obtained. The hybrid recording areal density may be decided by the dual-gradient (the thermal gradient and magnetic field gradient), According to the simulated results, the track density can reach 500KPTI, if the bit density is 1000kbPI, the area density will be 500Gb/in(2).

关键词： hybrid recording waveguide near field optical spot temperature gradient

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Far-field optical response of localized near-field enhancements induced by nano scatters in AgO_x super-resolution near-field structure

Far-field optical response of localized near-field enhanceme...

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Conference on advances in optical data storage technology

作者： Chu, TC Liu, WC Tsai, DP Natl Taiwan Univ Ctr Nanostorage Res Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The super-resolution near-field structure (super-RENS) is an ultrahigh-density near-field optical disk data storage medium which can achieve superior spatial resolution. Our previous studies found that enhanced local optical intensity occurred at the near field of the super-RENS disk, and the nonlinear near-field optical enhancement is related to the localized surface plasmons of silver clusters dissociated from the AgOx layer of the super-RENS disk. In this paper, we report the near-field and far-field properties of AgOx-type super-RENS with different embedded silver nanoparticles using two-dimensional finite-difference time-domain (FDTD) calculations. Highly localized enhancements are found between adjacent silver nanoparticles in the near fields. The far-field signals of different types silver nano scatters confirm the super-resolution capability of AgOx-type Super-RENS disks. The behaviors of far-field signals indicate the correlation between the enhanced localized surface plasmons and the super-resolution capabilities of AgOx-type super-RENS.

关键词： localized surface plasmon super-resolution near-field structure near-field optical storage optical disks finite-difference time-domain method metallic nanoparticles

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High bandwidth scientific data management using storage area networking: Lessons learned at the starfire optical range 20

High bandwidth scientific data management using storage area...

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20th IEEE Conference on Mass storage Systems and technology/11th NASA Goddard Conference on Mass storage Systems and technology

作者： Duncan, TS Sichler, MS USAF Res Lab Kirtland AFB NM 87117 USA

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.

关键词： Bandwidth Computer network management Force sensors Hardware Laboratories Military computing optical fiber networks optical sensors Research and development Sensor systems

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Challenges and opportunities for optical storage

Challenges and opportunities for optical storage

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Seventh International Symposium on optical storage, ISOS 2005

作者： Chen, Di Chen and Associates 2127 Centerview Lane Mound MN 55364 United States

optical technique for data storage was driven from the challenges to achieve data storage performance required by the user. The first attempt to address the recording density improvement over HDD using magneto-optic technology started over thirty years ago. Subsequent efforts to develop 15″, 12′ and 5 1/4″ WORM disc drives met with limited success. advances in semiconductor lasers, lithography, and auto focusing and tracking techniques finally allow the development of the Compact Disc to answer the call for improvement in audio recording technology and data distribution in mid to late 1980. Recordable and erasable technology then followed with the introduction of CD-R, CD-RW and MO drives and media. By early 1990, advances in high density recording with the use of shorter wavelength lasers, larger n.a. lenses, improved lithographic and data compression techniques, allows the development of 4.7 GB DVD drives and discs to answer the challenge for recording 2-hour high quality movies on a CD size disc. Recordable and erasable DVD became available in 2000, and Dual Layer DVD was introduced last year. With the advent of HDTV and movie in recent years, storage of 25 GB data in a DVD disc is needed. Blue-ray and HD-DVD are the leading technologies to answer this challenge. Looking to the future, optical storage areal density of one to two orders of magnitude improvement will be required to compete with HDD which is now reaching 133 Gb/in2. In addition, high data transfer rate of IGb/s, data security, copy protection, ease of use, cost and standards issues sums up the monumental challenges facing the optical recording industry in the years to come. Some of the leading technologies, such as multi-layer, new encoding schemes, volume recording, near-field optics, micro-optics, domain expansion, UV laser, holographic storage, could provide the answers. Meeting these challenges, optical storage could become the dominant recording technology to satisfy the data storage needs for

关键词： optical data storage

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Investigation of the growth and holographic storage properties of Fe:LiTaO₃ crystal

Investigation of the growth and holographic storage properti...

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Conference on advances in optical data storage technology

作者： Liu, CX Zhang, T Zhao, SZ Harbin Inst Technol Dept Appl Chem Harbin 150001 Peoples R China

ISBN: (纸本)0819455989

The LiTaO3 crystal doped with 0.03 wt% Fe2O3 was grown in a diameter-controlled Czochraski equipment using SiMo bar heater furnace. The photo-damage resistance ability, exponential gain coefficient, diffraction efficiency and response time of Fe:LiTaO3 and Fe:LiNbO3 crystals were measured. The measured results showed that the photo-damage resistance ability of Fe:LiTaO3 crystal was as much as 5 times higher than that of Fe:LiNbO3, the response speed of Fe:LiTaO3 crystal was improved one order of magnitude than that of Fe:LiNbO3, and the exponential gain coefficient and diffraction efficient of Fe:LiTaO3 crystal were smaller than that of Fe:LiNbO3, respectively. Using Fe:LiTaO3 crystal as recording medium, the obtained image was clear and complete in the holographic associative memory experiment using self-pump phase conjugate reflector.

关键词： Fe : LiTaO3 holographic storage exponential gain coefficient

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Plasmon nano-optical tweezers

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NATURE PHOTONICS 2011年第6期5卷 349-356页

作者： Juan, Mathieu L. Righini, Maurizio Quidant, Romain ICFO Inst Ciencies Foton Barcelona 08860 Spain ICREA Barcelona 08010 Spain

Conventional optical tweezers, formed at the diffraction-limited focus of a laser beam, have become a powerful and flexible tool for manipulating micrometre-sized objects. Extending optical trapping down to the nanometre scale would open unprecedented opportunities in many fields of science, where such nano-optical tweezers would allow the ultra-accurate positioning of single nano-objects. Among the possible strategies, the ability of metallic nanostructures to control light at the subwavelength scale can be exploited to engineer such nano-optical traps. This Review summarizes the recent advances in the emerging field of plasmon-based optical trapping and discusses the details of plasmon tweezers along with their potential applications to bioscience and quantum optics.

关键词： nature photonics Nature Photonics nature publishing group content journal optoelectronics optics biophotonics quantum optics cryptography spectroscopy terahertz technology light propagation lasers LEDs photovotaics fibre optics optical data storage

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iCDMS: An iSCSI-based CD mirroring server

iCDMS: An iSCSI-based CD mirroring server

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Conference on advances in optical data storage technology

作者： Han, DZ Xie, CS Liu, C JiNan Univ Dept Comp Sci Guangzhou 510632 Peoples R China Huazhong Univ Sci & Technol Natl Storage Syst Lab Sch Comp Sci Wuhan 430074 Peoples R China

ISBN: (纸本)0819455989

A iSCSI-based CD mirroring server (iCDMS) has been developed and tested. Firstly, the iCDMS can automate to concurrently mirror multi- CD with multi- CD drivers, and the CD includes VCD, DVD, and so on. Secondly, the iCDMS can provide both of the file I/O and the block I/O services by an iSCSI module, which converges the NAS and SAN advantages, as high performance and data sharing across platforms. Thirdly, the iCDMS greatly improves the I/O speed by Zero Copy mechanism. Fourthly, the iCDMS implements automatically - allocating I/O bandwidth for different users and applications by enriching the metadata operating semantic of the CD server, and allocate a wider bandwidth for applications that has higher priority, changing the old average allocating bandwidth pattern;Finally, the iCDMS improves paralleled file I/O performance with a parallel FTP server module. In the experiments, the iCDMS has ultra-high-throughput for both of the file I/O requests and the block I/O requests..

关键词： CD mirroring parallel FTP iSCSI bandwidth allocation

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Blue-ray-induced optical properties of noble metal oxide thin film in super-RENS disk

Blue-ray-induced optical properties of noble metal oxide thi...

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Conference on advances in optical data storage technology

作者： Liu, Q Fukaya, T Tominaga, J AIST CAN FOR Tsukuba Ibaraki 3058562 Japan

ISBN: (纸本)0819455989

The optical reflectance and transmittance of Platinum oxide (PtOx) and palladium oxide (PdOx) mask layer, which are used to super-re solution near-field structure (super-RENS) disk, are investigated using Z-scan technique, under blue laser (442 nm) irradiation. The power thresholds of the PtOx and PdOx decomposition are obtained;the reversible and irreversible features for the two kinds of mask layers are cleared. Deformation in the micro irradiation region on surface of the mask samples, which is formed by decomposition of the PtOx or PdOx driving the Z-scan, is analyzed by means of an atom force microscope (AFM). The deformation analyses agree well with the Z-scan results. The optical features obtained at 442nm wavelength are compared with those at 532-nm wavelength, and the power threshold difference between the two wavelengths is also analyzed in detail based on irradiation power density and absorption spectrum of the mask samples.

关键词： Transmittance Statistical analysis Reflectivity Absorption Oxides Near field optics Atomic force microscopy Metals Laser irradiation optical properties

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Analysis on control methods of two-stage positioning for high-density optical disk mastering

Analysis on control methods of two-stage positioning for hig...

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Conference on advances in optical data storage technology

作者： Shen, QH Jiang, PJ Qi, GS Xu, DY Song, J Tsing Hua Univ Opt Memory Natl Engn Res Ctr Dept Precis Instrument & Mech Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

Two stage positioning method which is composed of coarse positioning and fine positioning is a way to increase the precision of linear feeding in high density disk mastering. The control method of two stage positioning is proposed in this paper. Different control models are compared and the suitable one is chosen. The PID controllers for coarse and fine tables are designed. The numerical simulating results show that the two stage positioning system with PID controllers has good performance in linear feeding with steady error less than 10nm. The coarse positioning table compensates the major component of displacement in linear feeding while the fine positioning table compensates the minor one. The two stage positioning system can well satisfied the requirement of high density disk mastering in theoretical.

关键词： optical disc mastering two-stage positioning linear feeding PID controller numerical simulating

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