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Analysis of holographic data storage using a PA-LCoS device 4

Conference on optical Modelling and Design IV

作者： Martinez, Francisco J. Marquez, Andres Gallego, Sergi Fenoll, Sandra Ortuno, Manuel Frances, Jorge Bleda, Sergio Pascual, Inmaculada Univ Alicante Dept Fis Ing Sistemas & T Senal Ap 99 E-03080 Alicante Spain U Alicante IU Fis Aplicada Ciencias & Tecnol Ap 99 E-03080 Alicante Spain Univ Alicante Dept Opt Farmacol & Anat Ap 99 E-03080 Alicante Spain

ISBN: (纸本)9781510601345

Holographic data storage systems (HDSS) have been a promising and very appealing technology since the first laser developments in the sixties. Impact of ongoing advances in the various components needs to be explored in its specific application to HDSS. In this sense, continuous progress is being produced in spatial light modulator (SLM) technology where parallel-addressed liquid crystal on silicon (PA-LCoS) microdisplays have replaced previous liquid-crystal displays (LCD) in most of optics and photonics applications. PA-LCoS microdisplays are well adapted to display phase-only elements without coupled amplitude. In this paper, we analyse how PA-LCoS devices can also be used to display the widely applied binary intensity modulated (BIM) data pages. We also investigate hybrid-ternary modulated (HTM) data pages, which are very much demanding on the phase and amplitude modulation properties of an SLM. HTM data pages combine the ease of detection of BIM data pages, together with a large reduction of the DC term of the Fourier Transform of the data page. This reduction is necessary to avoid saturation of the recording material dynamic range. Simulated results show the magnitude of the expected DC term in the Fourier plane. We have verified the good performance of PA-LCoS to display BIM data pages. We have also obtained that pure HTM data pages cannot be produced with PA-LCoS devices, however, a rather close performance is obtained when implementing the pseudo-HTM data pages. In this work a more complete study of pseudo-HTM modulation is offered.

关键词： Holographic and volume memories liquid crystal on silicon displays parallel aligned spatial light modulation

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Proceedings - 2016 3rd International Conference on advances in Computing, Communication and Engineering, ICACCE 2016

Proceedings - 2016 3rd International Conference on Advances ...

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3rd International Conference on advances in Computing, Communication and Engineering, ICACCE 2016

ISBN: (纸本)9781509025763

The proceedings contain 79 papers. The topics discussed include: aircycle proof-of-concept: work towards using gamification and IoT to fight the global obesity crisis;exploring RSSI dependency on height in uhf for throughput optimization;analysis of Bluetooth and Wi-Fi interference in smart home networks;location based analysis of AODV performance in the presence of black hole nodes;semi-autonomous vehicles: towards a conceptual model of compliance with owner manual standards;implementing a compact data format for Bluetooth and 3G communication to monitor remote pipelines;a user scheduling scheme in LTE/LTE-a networks for a mixed traffic environment;design considerations of a topology control prototype for wireless mesh networks;optimized survivability scheme to safeguard end to end QoS in the next generation optical networks;the feasibility of a WLAN based power subsation monitoring platform;pattern recognition technique to eliminate multipath and radio-frequency interference in an automated antenna measurement system;optimal power control strategy of a distributed energy system incorporating demand response;variation of altitude on the variance of angle of arrival fluctuations for optical beam propagation in free space optical communications;an empirical analysis of semantic web mechanisms for storage and query of ontologies in relational databases;the influence of external actors in the formulation of national information and communications technology policies in developing countries: case of Swaziland;and capacity improvement for VOiP based two-tier CRN using space-time spectrum sensing.

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Long-term data storage in diamond

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SCIENCE advances 2016年第10期2卷 e1600911页

作者： Dhomkar, Siddharth Henshaw, Jacob Jayakumar, Harishankar Meriles, Carlos A. CUNY City Coll Dept Phys New York NY 10031 USA CUNY Grad Ctr New York NY 10016 USA

The negatively charged nitrogen vacancy (NV-) center in diamond is the focus of widespread attention for applications ranging from quantum information processing to nanoscale metrology. Although most work so far has focused on the NV- optical and spin properties, control of the charge state promises complementary opportunities. One intriguing possibility is the long-term storage of information, a notion we hereby introduce using NV- rich, type 1b diamond. As a proof of principle, we use multicolor optical microscopy to read, write, and reset arbitrary data sets with two-dimensional (2D) binary bit density comparable to present digital-video-disk (DVD) technology. Leveraging on the singular dynamics of NV- ionization, we encode information on different planes of the diamond crystal with no cross-talk, hence extending the storage capacity to three dimensions. Furthermore, we correlate the center's charge state and the nuclear spin polarization of the nitrogen host and show that the latter is robust to a cycle of NV- ionization and recharge. In combination with super-resolution microscopy techniques, these observations provide a route toward subdiffraction NV charge control, a regime where the storage capacity could exceed present technologies.

关键词： Physics data storage diamond nitrogen vacancy optical memory

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Compositional Changes for Reduction of Polymerisation-Induced Shrinkage in Holographic Photopolymers

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advances IN MATERIALS SCIENCE AND ENGINEERING 2016年第1期2016卷 1-11页

作者： Cody, D. Moothanchery, M. Mihaylova, E. Toal, V. Mintova, S. Naydenova, I. Dublin Inst Technol Ctr Ind & Engn Opt Dublin 8 Ireland Dublin Inst Technol Sch Phys Fac Sci Dublin 8 Ireland Univ Agr Dept Math Informat & Phys Plovdiv Bulgaria Univ Caen LCS CRISMAT 6 Blvd Marechal Juin F-14050 Caen France

Polymerisation-induced shrinkage is one of the main reasons why many photopolymer materials are not used for certain applications including holographic optical elements and holographic data storage. Here, two compositional changes for the reduction of shrinkage in an acrylamide-based photopolymer are reported. A holographic interferometric technique was used to study changes in the dynamics of the shrinkage processes occurring in the modified photopolymer during holographic recording in real time. Firstly, the effect of the replacement of the acrylamide monomer in the photopolymer composition with a larger monomer molecule, diacetone acrylamide, on polymerisation-induced shrinkage has been studied. A reduction in relative shrinkage of 10-15% is obtained using this compositional change. The second method tested for shrinkage reduction involved the incorporation of BEA-type zeolite nanoparticles in the acrylamide-based photopolymer. A reduction in relative shrinkage of 13% was observed for acrylamide photopolymer layers doped with 2.5% wt. BEA zeolites in comparison to the undoped photopolymer.

关键词： POLYMERIZATION PHOTOPOLYMERS EXPANSION & contraction of concrete optical elements ACRYLAMIDE ZEOLITES NANOPARTICLES

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Device-level characterization of the flow of light in integrated photonic circuits using ultrafast photomodulation spectroscopy

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NATURE PHOTONICS 2015年第1期9卷 54-60页

作者： Bruck, Roman Mills, Ben Troia, Benedetto Thomson, David J. Gardes, Frederic Y. Hu, Youfang Mashanovich, Goran Z. Passaro, Vittorio M. N. Reed, Graham T. Muskens, Otto L. Univ Southampton Fac Phys Sci & Engn Southampton SO17 1BJ Hants England Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England Politecn Bari Dept Elect & Informat Engn I-70125 Bari Italy

advances in silicon photonics have resulted in rapidly increasing complexity in integrated circuits. New methods that allow the direct characterization of individual optical components in situ, without the need for additional fabrication steps or test structures, are desirable. Here, we present a device-level method for the characterization of photonic chips based on a highly localized modulation in the device using pulsed laser excitation. optical pumping perturbs the refractive index of silicon, providing a spatially and temporally localized modulation in the transmitted light, enabling time- and frequency-resolved imaging. We demonstrate the versatility of this all-optical modulation technique in imaging and in the quantitative characterization of a range of properties of silicon photonic devices, from group indices in waveguides, to quality factors of a ring resonator, and to the mode structure of a multimode interference device. Ultrafast photomodulation spectroscopy provides important information on devices of complex design, and is easily applicable for testing at the device level.

关键词： Spectroscopy Integrated optics Spectroscopy Imaging and sensing 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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Eternal memory: Long-duration storage concepts for space 66

Eternal memory: Long-duration storage concepts for space

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66th International Astronautical Congress 2015: Space - The Gateway for Mankind's Future, IAC 2015

作者： Guzman, Melissa Hein, Andreas M. Welch, Chris International Space University France Initiative for Interstellar Studies France

ISBN: (纸本)9781510818934

Eternal memory is information encoded in some medium and capable of surviving in storage for a very long time This paper explores the rationales for an eternal memory concept for space and also develops three concepts for it using product development methodology. Historical development drivers for data storage are storage density and processing speed, while longevity of data has been limited to decades. Recent advances in storage technologies, such as optical storage and DNA storage, allow data storage for timescales of millions to billions of years. Eternal memory concepts for space are of interest to initiatives such as Lunar Mission One, the Long Now Foundation and the Human Document Project. The recent technological advances and the focused initiative of these projects produces a gap for the development of eternal memory concepts for space. The study first identifies potential stakeholders, such as Lunar Mission One, the Long Now Foundation and the Human Document Project, and categorizes stakeholders by motivation. Stakeholder needs are interpreted from statements of motivation. Stakeholders want an eternal memory concept to encourage global public engagement, to move humanity toward becoming a dual-planet species, to embrace and constrain the information age, and to allow storage of information for a very long time. These needs are arranged hierarchically for each stakeholder and the most prevalent needs are selected. Metrics are then assigned to each need. A suggested storage technology and storage location are recommended for each case study. Each storage concept attempts to add value to stakeholders, addressing financial, scientific, technological, and socio-cultural needs.

关键词： Motivation

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Tunable picosecond spin dynamics in two dimensional ferromagnetic nanodot arrays with varying lattice symmetry

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RSC advances 2015年第43期5卷 34027-34031页

作者： Saha, Susmita Barman, Saswati Sugimoto, Satoshi Otani, YoshiChika Barman, Anjan SN Bose Natl Ctr Basic Sci Dept Condensed Matter Phys & Mat Sci Kolkata 700098 India Univ Tokyo Inst Solid State Phys Kashiwa Chiba 2778581 Japan RIKEN CEMS Wako Saitama 3510198 Japan

The in-plane configurational anisotropy of the frequency and nature of spin-wave modes in two-dimensional artificial Ni80Fe20 nanodot lattices arranged in closely packed rectangular, honeycomb and octagonal lattices are demonstrated by time-resolved magneto-optical Kerr effect measurements. The rectangular, honeycomb and octagonal lattices showed dominant two-fold, six-fold and eight-fold variation of frequency superposed with a weak four-fold anisotropy for specific spin-wave modes with the variation of the azimuthal angle of the external bias magnetic field. Micromagnetic simulations reveal that the observed anisotropy is due to the angular variation of the magnetostatic field distribution and the ensuing spin-wave mode profiles, which varies between arrays. The observations are important for selecting building blocks for future magnetic data storage and magnonic crystals for on-chip microwave communication and processing.

关键词： Magnetic storage

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Progress in second-generation holographic data storage

Progress in second-generation holographic data storage

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

作者： Ayres, Mark R. Anderson, Ken Askham, Fred Sissom, Brad Akonia Holog LLC Longmont CO 80501 USA

ISBN: (纸本)9781628412284

Holographic data storage (HDS) remains an attractive technology for big data. We report on recent results achieved with a demonstrator platform incorporating several new second-generation techniques for increasing HDS recording density and speed. This demonstrator has been designed to achieve densities that support the multi-terabyte storage capacities required for a competitive product. It leverages technology from an existing state-of-the-art pre-production prototype, while incorporating a new optical head designed to demonstrate several new technical advances. The demonstrator employs the new technique of dynamic aperture multiplexing in a monocular architecture. In a previous report, a monocular system employing angle-polytopic multiplexing achieved a recording density over 700 Gbit/in(2), exceeding that of contemporaneously shipping hard drives [1]. Dynamic aperture multiplexing represents an evolutionary improvement with the potential to increase this figure by over 200%, while still using proven angle-polytopic multiplexing in a monocular architecture. Additionally, the demonstrator is capable of two revolutionary advances in HDS technology. The first, quadrature homodyne detection, enables the use of phase shift keying (PSK) for signal encoding, which dramatically improves recording intensity homogeneity and increases SNR. The second, phase quadrature holographic multiplexing, further doubles density by recording pairs of holograms in quadrature (QPSK encoding). We report on the design and construction of the demonstrator, and on the results of current recording experiments.

关键词： holographic data storage big data optical data storage holography

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Holographic data storage: Science Fiction or Science Fact

Holographic Data Storage: Science Fiction or Science Fact

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

作者： Anderson, Ken Ayres, Mark Askham, Fred Sissom, Brad Akonia Holog LLC Longmont CO 80501 USA

ISBN: (纸本)9781628412284

To compete in the archive and backup industries, holographic data storage must be highly competitive in four critical areas: total cost of ownership (TCO), cost/TB, capacity/footprint, and transfer rate. New holographic technology advancements by Akonia Holographics have enabled the potential for ultra-high capacity holographic storage devices that are capable of world record bit densities of over 2-4Tbit/in(2), up to 200MB/s transfer rates, and media costs less than $10/TB in the next few years. Additional advantages include more than a 3x lower TCO than LTO, a 3.5x decrease in volumetric footprint, 30ms random access times, and 50 year archive life. At these bit densities, 4.5 Petabytes of uncompressed user data could be stored in a 19" rack system. A demonstration platform based on these new advances has been designed and built by Akonia to progressively demonstrate bit densities of 2Tb/in(2), 4Tb/in(2), and 8Tb/in(2) over the next year.

关键词： holographic data storage big data optical data storage holography bit density archive storage cold storage warm storage

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Azobenzamide-based proteomorphous objects as a light/pH-induced photoswitchable module

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RSC advances 2014年第14期4卷 7174-7177页

作者： Yadav, Promod Kumar Singh, Alok Kumar Kumar, Anup Kumari, Niraj Gulino, Antonino Mishra, Lallan Gupta, Tarkeshwar Banaras Hindu Univ Dept Chem Varanasi 221005 Uttar Pradesh India Univ Delhi Dept Chem Delhi 110007 India Univ Catania INSTM Udr Catania Dipartimento Sci Chim I-95125 Catania Italy

Azobenzamide-based molecular scaffolds viz. (E)-4,4'(diazene-1,2-diyl)bis(N-pyridin-3-yl)benzamide (1) and (E)-4,40(diazene-1,2-diyl)bis(N-pyridin-4-yl) benzamide (2), yield proteomorphous architectures i.e., secondary "beta-pleated sheet" and tertiary "beta-hairpin" respectively, that offer "optical data storage" competence as a result of reversible light-induced conformational changes in organic solvent.

关键词： Digital storage

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