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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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Prospect of Recording Technologies for Higher storage Performance

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IEEE TRANSACTIONS ON MAGNETICS 2011年第3期47卷 539-545页

作者： Park, Kyoung-Su Park, Young-Pil Park, No-Cheol Yonsei Univ Dept Mech Engn Seoul 120749 South Korea

With the progress of information technology (IT), we need more advanced storage devices to accommodate the unprecedented expansion of information and the rapidly changing IT environment. Magnetic and optical recording storage devices, such as hard disk drive (HDD) and optical disk drive (ODD), are the best candidates for satisfying these demands and requirements. For 10 Tb/in(2) HDD magnetic recording, we need to develop several advanced and innovative technologies related to the head disk interface (HDI), head/media, servo, and signal processing in current perpendicular magnetic recording (PMR). And, several new read/write mechanisms, such as heat-assisted magnetic recording (HAMR) and bit-patterned media (BPM), are being investigated by many researchers at several institutes around the world. In optical data storage, the page-based holographic data storage system (HDSS) and micro-HDSS are expected to achieve a higher user capacity with beyond terabyte. The near field recording (NFR) system was developed to confirm the feasibility of achieving a multiple terabyte capacity, and currently, through the application of NF nanogap servo system using a flexible media, it is possible to enhance the recording density and data transfer rate together.

关键词： Dual stage actuator (DSA) dynamic TFC holographic data storage system (HDSS) micro HDSS near field recording (NFR) perpendicular magnetic recording (PMR) track mis-registration (TMR) two-dimensional magnetic recording (TDMR)

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Achieve both multi-wavlength and multi-level optical storage on compact disc by diarylethene

Achieve both multi-wavlength and multi-level optical storage...

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conference on advances in optical data storage technology

作者： Liu, XD Pu, SZ Zhao, FQ Qi, GS Zhang, FS Tsinghua Univ Dept Chem Minist Educ Key Lab Organ Optoelect & Mol Engn Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

The novel photochromism, diarylethene derivatives, 1,2-bis(2,5-dimethyl-thien-3-yl)perfluoro cyclopentene (la) and 1,2-bis(2-methyl-5-carbonylphenyl)-thien-3-yi) perfluorocyclo pentene(2a) were synthesized. And the PC discs of these two diarylethenes were prepared by spin-coating and vacuum evaporating method. To some extent, the high density recording was carried out the multi-wavelength and multi-level optical storage system. On the PC disc, single-wavelength and eight-level recording was realized by 2a, and two laser beams of 532nm and 650nm were used in two-wavelength eight-level recording and readout simultaneously. The results show that the reflectivity differences between the recording region and unrecording region is greater than 50%. The creation is that the two-wavelength and four-step optical recording on the PC disc achieved first time.

关键词： photochromism diarylethene multi-wavelength multi-level

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Fabrication of Pure Silica Core Multimode Ultraviolet optical Fibre Probes by Tube Etching

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Chinese Physics Letters 2007年第10期24卷 2876-2878页

作者：霍鑫潘石吴世法 Institute of Near-field Optics and Nanotechnology Department of Physics Dalian University of Technology Dalian 116024

As a light wave-guide component for transmitting ultraviolet （UV） laser pulses, pure silica core UV fibre probes have attracted a great deal of attention in the near-field optical data storage and bio-medical studies. We fabricate UV fibre probes with tips in dimension of about 2-5μm and taper angle 16° by the tube etching method, using 40% HF acid as etching solution and xylene as overlayer. Probes produced have curvy configuration with smooth surface. The yield of fine probes is rather high and etching operation greatly simplified. With higher damage threshold, pure silica core multimode UV fibre probes can be coupled into more laser power. In addition, using UV light reduces the cutoff wavelength of the fibre probes, which is in favour of increasing the transmission efficiency of the probe. Furthermore, the larger tip dimension helps to enhance the light throughput either. The advances of fabrication technique of UV optical fibre probe may further support the studies of UV light data storage, pulsed laser biosurgery and UV photolithography.

关键词： MICROSCOPY TIPS FIELD

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Design and fabrication of an integrated optical flying head for near-field recording system

Design and fabrication of an integrated optical flying head ...

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conference on advances in optical data storage technology

作者： Zi, YY He, ZJ Zhao, DP Li, QX Xi An Jiao Tong Univ Sch Mech Engn Xian 710049 Peoples R China

ISBN: (纸本)0819455989

To achieve 50nm flying height and accuracy tracking motion, it is essential to reduce the whole size of optical flying head (OFH) to improve mechanical and optical performance. With a view to the practical applicability, a novel integrated OFH based on the combination of SIL and objective lens (OL) is proposed, which possesses both high optical performance and reasonable tolerance in assembly. In addition, the fabrication process of this OFH is illustrated in detail. Finally, the main parameters of ABS for OFH slider are presented by means of numerical simulation. The simulation result demonstrates that the flying height of the integrated OFH slider can keep stable from 43nm to 44nm at different radium of optical disk, which can yield high signal/noise ratio optical signal during the read/write motion in near field recording (NFR) system.

关键词： near field recording solid immersion lens integrated optical flying head fabrication process

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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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Extremely long-duration storage concepts for space

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ACTA ASTRONAUTICA 2017年 130卷 128-136页

作者： Guzman, Melissa Hein, Andreas M. Welch, Chris Int Space Univ Parc Innovat1 Rue Jean Dominique Cassini F-67400 Illkirch Graffenstaden France Initiat Interstellar Studies 27-29 South Lambeth Rd London SW8 1SZ England

Recent advances in data storage technologies, such as optical storage and DNA storage, allow data storage for timescales of millions to billions of years. Alongside these developments, initiatives such as Lunar Mission One, the Long Now Foundation and the Human Document Project have promoted the long-term storage of data in order to foster public engagement and to preserve important data for future generations. However, proper concepts for long-term data storage in space are currently missing which match to the needs of stakeholders via the newly available technology. This paper explores the rationales for data storage over millions to billions of years in space and develops three 'time capsule' concepts addressing specific stakeholder needs. First, existing stakeholders are identified and categorized with respect to their motivation. Stakeholder needs are interpreted from statements of motivation. As key motivations, "encouraging global public engagement", "moving humanity toward becoming a dual-planet species", "embracing and constraining the information age", and "allowing storage of information for a very long time" are identified. These needs are then arranged hierarchically for each stakeholder and the most prevalent needs are selected. Metrics are then assigned to each need. One or more storage technologies and storage locations are recommended for each case study. A key technology for storage durations of millions to billions of years seems to be digital DNA storage. Future work aims at developing more detailed storage concepts along with the interactions with the space system into which it is going to be integrated.

关键词： data storage Time capsule Existential risks

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Two-photon absorption: an overview of measurements and principles

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advances IN OPTICS AND PHOTONICS 2010年第4期2卷 451-518页

作者： Rumi, Mariacristina Perry, Joseph W. Georgia Inst Technol Sch Chem & Biochem Atlanta GA 30332 USA Georgia Inst Technol Ctr Organ Photon & Elect Atlanta GA 30332 USA

The range of organic compounds whose degenerate two-photon absorption (2PA) spectrum has been reported has increased rapidly in recent years, in parallel with the growing interest in applications based on the 2PA process. The comparison of results from different techniques is not always straightforward, and experimental conditions employed may vary significantly. We overview the concepts underlying 2PA measurements and the common assumptions and approximations used in the data analysis for various techniques. The importance of selecting appropriate excitation regimes under which measurements should be performed and of avoiding contributions from absorption mechanisms in addition to 2PA will be emphasized. (C) 2010 optical Society of America

关键词： Electric fields Holographic recording materials Light matter interactions optical data storage optical limiting Three dimensional optical data storage

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optical data storage with diffraction-unlimited resolution

Optical data storage with diffraction-unlimited resolution

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conference on Lasers and Electro-Optics Europe & International Quantum Electronics conference (CLEO/Europe-IQEC)

作者： Gu, Min Swinburne Univ Technol Fac Engn & Ind Sci Ctr Microphoton Hawthorn Vic 3122 Australia

ISBN: (纸本)9781479905942

optical data storage is an important and critical part of optical information technology in which case photons rather than electrons are used for information generation, processing, transmission and storage. We have witnessed the revolution of photonics in optical communications. The advance in photonic chips will allow for the development of ultrafast optical signal generation and processing. While optical data storage such as the optical compact (CD) disk, digital video (DVD) disk and Blue-ray disk technologies has transformed our society in the last two decades, the development in this area has been slow down and seemingly become less active due to the fast development of flush memory and hard disks. However, the optical data storage technology has held its distinctive advantages of long lifetime, low-energy consumption, and ultra-secure encryption [1-3]. Nanophotonics that is the integration of photonics and nano-materials has extended optical data storage from three-dimensions to five dimensions or more [1, 2]. If combined with supresolution optics that allows for the break of the diffraction limit, nanophotonics-enabled optical data storage will make it possible to develop Petabype optical disks, forming a green-technology platform for future data centres. © 2013 IEEE.

关键词： optical data storage

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Trends in optical recording

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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1999年第1-3期193卷 519-525页

作者： Borg, HJ van Woudenberg, R Philips Res Labs NL-5656 AA Eindhoven Netherlands

optical recording technology is evolving rapidly, driven by the demands of higher storage capacities and increasing data rates. In this contribution, we discuss the technology roadmap of optical disc recording. The emphasis will be on rewritable optical recording, in particular, phase change recording. (C) 1999 Elsevier Science B.V. All rights reserved.

关键词： optical recording phase change recording magneto-optical recording

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