The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

Yasuo Wada - One of the best experts on this subject based on the ideXlab platform.

  • Prospects for single molecule information processing devices
    Proceedings of the IEEE, 2001
    Co-Authors: Yasuo Wada
    Abstract:

    Present information technologies use semiconductor devices and magnetic/Optical Discs; however, they are all foreseen to face fundamental limitations within a decade. Therefore, superseding devices are required for the next paradigm of high-performance information technologies. "Single molecule devices" have been expected to be the most probable candidate; however, they have not been made practical since they were first proposed more than a quarter of a century ago. The major obstacles are the extreme difficulty in accessing a single molecule, and the very complicated electron states of a molecule connected to electrodes. With the advancements in scanning tunneling microscope (STM) and simulation technologies, the design and demonstration of single molecule devices are close to reality. This paper first reviews the architectures suitable for single molecule information processing, in which it is claimed that the performances of information processing is higher, if speed and element number product is larger in almost all architectures. Then, prospects for single molecule devices, including switching devices, wires, diodes, nanotubes, Optical devices, storage devices and sensing devices for future information technologies and other advanced applications are described. Four milestones for realizing the peta/exa-floating operations per second (FLOPS) personal molecular supercomputer are proposed. Current status and necessary technologies of the first milestone are described and necessary technologies for the next three milestones are also discussed.

  • Prospects for single molecule information processing devices
    Current Applied Physics, 2001
    Co-Authors: Yasuo Wada
    Abstract:

    Abstract Present information technologies use semiconductor devices and magnetic/Optical Discs, however, they are all foreseen to face fundamental limitations within a decade. This paper reviews prospects for future information technologies and other advanced applications, placing emphasis on the information processing switching devices. Architectures are briefly discussed in the light of suitability for the advanced information processing. Candidate single molecule information processing device ideas are also discussed and evaluated based on the necessary characteristics of information devices. Possible four milestones for realizing the future high performance personal molecular supercomputer are proposed. Current status and necessary technologies of the first milestone, as well as necessary technologies for the next three milestones are described.

Jordi Bonache - One of the best experts on this subject based on the ideXlab platform.

  • an approach for the design of passive uhf rfid tags mounted on Optical Discs
    IEEE Transactions on Antennas and Propagation, 2013
    Co-Authors: Simone Zuffanelli, Gerard Zamora, Ferran Paredes, Ferran Martin, Jordi Bonache
    Abstract:

    In this paper, an innovative design strategy for UHF-RFID tags mounted on Optical Discs (such as DVDs) is presented. By using the metal layer of the disc as the main radiating element, it is possible to overcome the severe limitations of the existing tags for disc identification in terms of read range and bandwidth. The design and synthesis process, based on the proposed circuit model of the tag, is described. A worldwide UHF-RFID tag prototype, for direct mounting on a DVD disc, is designed and fabricated. The measured read range demonstrates that the presented method drastically improves the performance within the whole UHF-RFID band (840-930 MHz), in comparison to the DVD tags found in the available literature.

Simone Zuffanelli - One of the best experts on this subject based on the ideXlab platform.

  • UHF-RFID Tags for Optical Discs
    Antenna Design Solutions for RFID Tags Based on Metamaterial-Inspired Resonators and Other Resonant Structures, 2017
    Co-Authors: Simone Zuffanelli
    Abstract:

    This chapter is focused on the design of UHF-RFID tags to be mounted on Optical Discs (CDs, DVDs, Blu-ray Discs). Due to the reflective layer buried under their surface, Optical Discs must be treated like metallic objects within the context of RFID tagging. The most challenging aspect is that the common solutions employed for metallic surfaces are not suitable in this case, and the solutions created ad hoc suffer from poor performance when compared to general-purpose UHF-RFID tags. In this work, a novel approach to the problem is proposed, which allows overcoming the abovementioned limitations and greatly reduces the performance gap with respect to general-purpose tags.

  • an approach for the design of passive uhf rfid tags mounted on Optical Discs
    IEEE Transactions on Antennas and Propagation, 2013
    Co-Authors: Simone Zuffanelli, Gerard Zamora, Ferran Paredes, Ferran Martin, Jordi Bonache
    Abstract:

    In this paper, an innovative design strategy for UHF-RFID tags mounted on Optical Discs (such as DVDs) is presented. By using the metal layer of the disc as the main radiating element, it is possible to overcome the severe limitations of the existing tags for disc identification in terms of read range and bandwidth. The design and synthesis process, based on the proposed circuit model of the tag, is described. A worldwide UHF-RFID tag prototype, for direct mounting on a DVD disc, is designed and fabricated. The measured read range demonstrates that the presented method drastically improves the performance within the whole UHF-RFID band (840-930 MHz), in comparison to the DVD tags found in the available literature.

Rafael Oser - One of the best experts on this subject based on the ideXlab platform.

  • Materials for Optical Disc Substrates
    MRS Bulletin, 2006
    Co-Authors: Friedrich-karl Bruder, Konstantinos Douzinas, Uli Franz, Wilfried Haese, Rafael Oser
    Abstract:

    Optical data storage has become the mainstream technology during the past two decades for distributing audio, video, and software content as well as for recording and archiving personal data. The continuous demand for ever-higher storage capacities and faster data transfer has led to the development of three disc format families using infrared (compact Discs), red (digital versatile Discs), and blue lasers (Blu-ray Discs or high-density DVDs). Substrate materials used in Optical Discs need to possess a complex property profile with sufficient Optical, rheological, mechanical, and processing characteristics to ensure cost-efficient replication, good read/write performance, and long-term media stability. Bisphenol-A polycarbonate (BPA-PC) is the substrate material of choice and has undergone several optimization cycles to always meet new format specifications.

Matthias Wuttig - One of the best experts on this subject based on the ideXlab platform.

  • Design rules for phase-change materials in data storage applications.
    Advanced materials (Deerfield Beach, Fla.), 2011
    Co-Authors: Dominic Lencer, Martin Salinga, Matthias Wuttig
    Abstract:

    Phase-change materials can rapidly and reversibly be switched between an amorphous and a crystalline phase. Since both phases are characterized by very different Optical and electrical properties, these materials can be employed for rewritable Optical and electrical data storage. Hence, there are considerable efforts to identify suitable materials, and to optimize them with respect to specific applications. Design rules that can explain why the materials identified so far enable phase-change based devices would hence be very beneficial. This article describes materials that have been successfully employed and dicusses common features regarding both typical structures and bonding mechanisms. It is shown that typical structural motifs and electronic properties can be found in the crystalline state that are indicative for resonant bonding, from which the employed contrast originates. The occurence of resonance is linked to the composition, thus providing a design rule for phase-change materials. This understanding helps to unravel characteristic properties such as electrical and thermal conductivity which are discussed in the subsequent section. Then, turning to the transition kinetics between the phases, the current understanding and modeling of the processes of amorphization and crystallization are discussed. Finally, present approaches for improved high-capacity Optical Discs and fast non-volatile electrical memories, that hold the potential to succeed present-day's Flash memory, are presented.