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Thermo-resistive flight attitude measurements of flying heads in near-field magnetooptical data storage

IEEE TRANSACTIONS ON MAGNETICS 2005年第10期41卷 2863-2865页

作者： Gatzen, HH Knappmann, S Neumeister, C Moessner, J Mrowka, Z Morsbach, C Inst Microtechnol D-30823 Garbsen Germany Deutsch Thomson Brandt GmbH D-78003 Villingen Schwenningen Germany

The development of an optical recording system which is based on the flying head technology requires to determine the head's dynamic flight behavior. To do so, a thermo-resistive test head was created. It uses thermo-resistors embedded in the air-bearing surface (ABS). Joule heating by the sensing current generates a heat flow across the head-disk spacing which highly depends on the distance between ABS and disk. Due to the thermal sensors located on each of the four corners of a slider, pitch, roll, and flying height variations may be measured.

关键词： flying heads magnetooptical data storage thin-film technology

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12.5 Gb/s optical Driver and Receiver ICs With Double-Threshold AGC for SATA Out-of-Band Transmission

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IEEE JOURNAL OF SOLID-STATE CIRCUITS 2016年第7期51卷 1641-1650页

作者： Uemura, Hiroshi Kurita, Yoichiro Furuyama, Hideto PETRA Toshiba Microelect Ctr Kawasaki Kanagawa 2128583 Japan

In order to realize optical interconnection for high-speed low-latency direct-attached storage in a data center, we developed double-threshold automatic gain control (AGC) that enables reliable optical out-of-band (OOB) transmission in de facto standard storage interfaces such as Serial ATA (SATA) and Serial Attached SCSI (SAS). OOB is quasiternary signaling composed of differential burst signals separated by idle conditions and is poorly compatible with general optical interconnections. It has excessively large gain and substantially affects noise-susceptible idle conditions. 12.5 Gb/s driver and receiver ICs with the doublethreshold AGC were fabricated in TSMC 90 nm CMOS process. The double-threshold AGC enabled reliable optical OOB transmission by noise rejection in the idle conditions and by excess gain reduction for suppression of ringing and decay after the burst signals. As a result, optically connected SATA 6 Gb/s transmission was realized for the first time.

关键词： Direct attached storage double threshold automatic gain control optical driver optical interconnection optical receiver out-of-band signal serial ATA serial attached SCSI

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Miniaturized design of the optical head used for three-dimensional photon storage

Miniaturized design of the optical head used for three-dimen...

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conference on Electronics and Structures for MEMS II

作者： Zhang, GP Cent China Normal Univ Dept Phys Wuhan 430079 Peoples R China

ISBN: (纸本)0819443212

The two-photon storage technology is discussed for the ultra-high-density three-dimensional optical data storage in this paper. We present the miniatured design of the optical head for the two-photon storage. Binary optical technology is used to obtain the desired reading and writing beams in an integrated optical head. Arrayed optical head system is designed to increase the data transmission speed. This design can reduce the weight and simplify the structure of the optical head system, and is helpful to make the two-photon storage technology commercialized.

关键词： micro-optics optical head optical disk two-photon storage binary optics

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Prospects and philosophy for high-density optical recording

Prospects and philosophy for high-density optical recording

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conference on optical data storage held as part of the SPIE Optics + Photonics

作者： Milster, Tom D. Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9781628412284

In recent years, the commercial impact of optical data storage systems has been displaced by new technologies. Historically, optical data storage displaced older technologies, like consumer magnetic tape, so it is not unexpected that the same fate could pass optical data storage technology into the "retro" domain. In this paper, the basic building blocks of optical data storage are discussed, and limits based on current understanding are presented. Then, conceptual and philosophical arguments are presented to direct intuition toward future possibilities that may provide avenues to develop displacement data storage technology. For example, current understanding puts minimum practical data mark transverse dimensions in the range of 10nm by 10nm, regardless of recording technology. At the conservative assignment of 1 bit per mark area, this mark size equates to about 6,500 Gb/in(2) (10(9) bits per square inch) of surface area. In order to gain the attention of research investment, displacement technologies need to target a 100X improvement in data density or about 1nm by 1nm mark size, with an effective surface data density of over 650,000 Gb/ in(2). Research and engineering mindsets for displacement data storage technologies should address this goal to be considered significant. Otherwise, advancements in known technologies will probably evolve to satisfy demand.

关键词： High numerical aperture solid immersion lens optical data storage

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A semiconducting thermooptic material for potential application to super-resolution optical data storage

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SURFACE & COATINGS technology 2005年第1-3期193卷 335-339页

作者： Lee, HS Cheong, B Lee, TS Lee, KS Kim, WM Huh, JY Korea Inst Sci & Technol Thin Film Mat Res Ctr Seoul 136791 South Korea Korea Univ Coll Engn Dept Mat Sci Engn Seoul 136701 South Korea

To find its practical use in ultrahigh density optical data storage, superresolution (SR) technique needs a material that can render a high SR capability at no cost of durability against repeated read/write. Thermoelectric materials are proposed as candidates capable of yielding solid state SR effects in the absence of phase changes that are detrimental to durability. As a prototype material, PbTe is selected due to a large thermoelectric Seebeck coefficient and a high stability of a crystalline single phase state up to its melting temperature of 924 degrees C. A preliminary study of Pb51Te49 thin films was carried out with the following findings: Firstly, under exposure to pulsed light, completely reversible changes in transmittance take place regardless of power. Secondly, light transmittance grows with increasing laser power and this is not due to melting except at relatively high powers. By way of optical calculations using the measured reflectance and transmittance values combined with thermal calculations, a temperature variation of effective optical constants (n, k) was also estimated to find that both of them decrease with increasing temperature. (c) 2004 Elsevier B.V. All rights reserved.

关键词： optical data storage superresolution thermoelectric thermooptic PbTe

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Deep learning in optical metrology:a review

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Light(Science & Applications) 2022年第4期11卷 466-519页

作者： Chao Zuo Jiaming Qian Shijie Feng Wei Yin Yixuan Li Pengfei Fan Jing Han Kemao Qian Qian Chen Smart Computational Imaging(SC)Laboratory Nanjing University of Science and Technology210094 NanjingJiangsu ProvinceChina Jiangsu Key Laboratory of Spectral Imaging&Intelligent Sense Nanjing University of Science and Technology210094 NanjingJiangsu ProvinceChina School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK School of Computer Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

With the advances in scientific foundations and technological implementations,optical metrology has become versatile problem-solving backbones in manufacturing,fundamental research,and engineering applications,such as quality control,nondestructive testing,experimental mechanics,and *** recent years,deep learning,a subfield of machine learning,is emerging as a powerful tool to address problems by learning from data,largely driven by the availability of massive datasets,enhanced computational power,fast data storage,and novel training algorithms for the deep neural *** is currently promoting increased interests and gaining extensive attention for its utilization in the field of optical *** the traditional,,physics-basedH approach,deep-learning-enabled optical metrology is a kind of,/data-drivenw approach,which has already provided numerous alternative solutions to many challenging problems in this field with better *** this review,we present an overview of the current status and the latest progress of deep-learning technologies in the field of optical *** first briefly introduce both traditional image-processing algorithms in optical metrology and the basic concepts of deep learning,followed by a comprehensive review of its applications in various optical metrology tasks,such as fringe denoising,phase retrieval,phase unwrapping,subset correlation,and error *** open challenges faced by the current deep-learning approach in optical metrology are then ***,the directions for future research are outlined.

关键词： backbone subset versatile

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Embedded optical interconnect technology in data storage systems

Embedded optical interconnect technology in data storage sys...

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conference on Micro-Optics 2010

作者： Pitwon, Richard C. A. Hopkins, Ken Milward, Dave Muggeridge, Malcolm Xyratex Technol Ltd Havant PO9 1SA Hants England

ISBN: (纸本)9780819481894

As both data storage interconnect speeds increase and form factors in hard disk drive technologies continue to shrink, the density of printed channels on the storage array midplane goes up. The dominant interconnect protocol on storage array midplanes is expected to increase to 12 Gb/s by 2012 thereby exacerbating the performance bottleneck in future digital data storage systems. The design challenges inherent to modern data storage systems are discussed and an embedded optical infrastructure proposed to mitigate this bottleneck. The proposed solution is based on the deployment of an electro-optical printed circuit board and active interconnect technology. The connection architecture adopted would allow for electronic line cards with active optical edge connectors to be plugged into and unplugged from a passive electro-optical midplane with embedded polymeric waveguides. A demonstration platform has been developed to assess the viability of embedded electro-optical midplane technology in dense data storage systems and successfully demonstrated at 10.3 Gb/s. Active connectors incorporate optical transceiver interfaces operating at 850 nm and are connected in an in-plane coupling configuration to the embedded waveguides in the midplane. In addition a novel method of passively aligning and assembling passive optical devices to embedded polymer waveguide arrays has also been demonstrated.

关键词： data storage systems optical backplanes optical printed circuit boards optical interconnect optical waveguides optical polymer optical alignment pluggable optical connector

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optical data storage with double random phase codes and wavelength encryption

Optical data storage with double random phase codes and wave...

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conference on Advanced optical storage technology

作者： Zhang, GP Chen, SJ Zhu, ZR Cent China Normal Univ Dept Phys Hubei 430079 Peoples R China

ISBN: (纸本)0819447196

In this paper, a novel double encryption technology is presented. It can encrypt data with not only double phase codes, but also the wavelength. The phase keys and the wavelength keys must be known simultaniously to retrive the encryping data, otherwise, the reconstructed data will be white noise like. The basic configuration and principle of optical holographic storage system are first introduced. Holographic data storage can be encrypted by coding the phase of reference beams through orthogonal phase coding. Double phase-encoded holographic storage can be done by placing two phase masks on the input plane and FP plane respectively. When one wants to retrive the data, he must have the same mask placed on the FP plane, otherwise the data can not be reconstructed. Finally, the encrypted holographic storage system combining optical wavelength and double phase codes is presented theoretically, and proved to be valid by the computer simulation.

关键词： holographic optical storage phase encoding wavelength encryption Fourior transform

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Holographic memory for high density data storage and high speed pattern recognition

Holographic memory for high density data storage and high sp...

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conference on optical Information Processing technology

作者： Gu, C Univ Calif Santa Cruz Dept Elect Engn Santa Cruz CA 95064 USA

ISBN: (纸本)0819447188

As computers and the internet become faster and faster, more and more information is transmitted, received, and stored everyday. The demand for high density and fast access time data storage is pushing scientists and engineers to explore all possible approaches including magnetic, mechanical, optical, etc. optical data storage has already demonstrated its potential in the competition against other storage technologies. CD and DVD are showing their advantages in the computer and entertainment market. What motivated the use of optical waves to store and access information is the same as the motivation for optical communication. Light or an optical wave has an enormous capacity (or bandwidth) to carry information because of its short wavelength and parallel nature. In optical storage, there are two types of mechanism, namely localized and holographic memories. What gives the holographic data storage an advantage over localized bit storage is the natural ability to read the stored information in parallel, therefore, meeting the demand for fast access. Another unique feature that makes the holographic data storage attractive is that it is capable of performing associative recall at an incomparable speed. Therefore, volume holographic memory is particularly suitable for high-density data storage and high-speed pattern recognition. In this paper, we review previous works on volume holographic memories and discuss the challenges for this technology to become a reality.

关键词： Holography data storage Holograms Volume holography Crystals Photopolymers Multiplexing Pattern recognition Holographic materials optical storage

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Historical evolution of magnetic data storage devices and related conferences

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MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION storage AND PROCESSING SYSTEMS 2018年第11期24卷 4423-4436页

作者： Bhushan, Bharat Ohio State Univ Nanoprobe Lab Bio & Nanotechnol & Biomimet 201 W 19th Ave Columbus OH 43210 USA

Telegraphic invention by Danish engineer Valdemar Poulson in 1898 was the first demonstration that a magnetic recording medium could be used to record information and for playback. It was not until 1947, that 3M shipped the first commercial oxide tape coated on paper backing, and in 1953, IBM shipped the first magnetic tape drive, IBM 727, for data storage. IBM invented the first hard disk drive, IBM 305, called the random access method of accounting and control (RAMAC) for data storage. The RAMAC stored 5MB of data and used fifty 24-in. diameter disks. The drive could be housed in a room of about 9mx15m. It weighed over a ton and had to be moved around by forklifts. The cost was USD $250,000 at the time (a whopping $50,000 per MB!). In 2018, one could buy a 30TB tape cartridge or 1TB portable hard disk drives (with a 2.5-in. diameter disk), for about USD $100. Since the late 1970s, the tribology of head-medium interface has been considered a limiting technology for development of reliable drives with ever increasing recording densities. Given the importance of tribology, a first ever symposium on Tribology and Mechanics of Magnetic storage Systems was held in 1984 at the ASME/STLE Tribology conference, co-organized by B. Bhushan, D. Bogy, N. Eiss and F. Talke, and annually thereafter by Bhushan and Eiss. Many electromechanical, materials science, design and manufacturing issues also became important. In order to broaden the scope to include mechanical issues, the first International Symposium on advances in Information storage Systems was organized at the ASME Winter Annual Meeting in 1989 by B. Bhushan, and annually thereafter. B. Bhushan led the founding of Information storage and Processing Systems (ISPS) Sub-division in ASME in 1992 which was elevated to a Division level in 1996. In 1993, the conference was renamed as the Annual conference on ISPS. In 2018, the 27th Annual conference on ISPS was held after 30th year of its inception, and the ISPS division celeb

关键词： Tribology

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