巻号一覧
32 巻, 1 号
選択された号の論文の11件中1～11を表示しています
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沖野 芳弘2004 年 32 巻 1 号 p. 4
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーPDF形式でダウンロード (122K) -
山本 学, 桜武 仁史2004 年 32 巻 1 号 p. 5-10
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーIn the last several years, the research and development of high capacity information storage using holographic technology has been actively carried out by many researchers. This has been driven by several factors. First, the availability and performance of components for drives have changed dramatically. Second, low-cost polymeric storage media which meet many requirements for practical drive systems have been developed. Third, new multiplexing technologies which permit very high density storage with simple optical system configurations have been developed. Holographic data storage technologies could satisfy the requirements of the data warehousing and information processing, as well as of the many applications related with the broadband network to meet the demands of internet traffic. In this paper, we show an outline of holographic data storage technologies. Technology contents relate to a system configuration, recording media and signal processing of two-dimensional digital data. We also discuss the future potential of holographic memory.抄録全体を表示PDF形式でダウンロード (1310K) -
田中 拓男, 河田 聡2004 年 32 巻 1 号 p. 11-16
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーThree-dimensional multi-layered optical storage is one of the most promising methods that break the limitation of recording density in optical storage. It stores the bit information onto the multilayered recording planes inside the thick recording medium and realizes the tremendous large recording capacity. This paper describes the recording/reading principles, the systems, and the materials suitable for three-dimensional multi-layered memory. We also present the experimental results that using photochromic organic materials and rhodamine-B-doped and Au(III)-doped PMMA for recording medium.抄録全体を表示PDF形式でダウンロード (496K) -
富永 淳二2004 年 32 巻 1 号 p. 17-21
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーSuper-resolution technologies for ultrahigh-density optical data storage are described. Applying optical nonlinear thin films, super-resolution readout is attained in less than the optical diffraction limit. In combination with near-field principle, it is further improved in less than 100 nm. In this paper, we discuss the basic principle of near-field optic and related surface and localized surface plasmon polaritons at first, and discribe several applications with metallic nanoparticles and wires to future optical disk technology.抄録全体を表示PDF形式でダウンロード (488K) -
後藤 顕也2004 年 32 巻 1 号 p. 22-28
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーHigher density optical disks with higher data rate and technological capability of super parallel optical heads using VCSEL (vertical cavity surface emitting laser) array are described. Optical heads using the VCSEL array and microlens array to get higher evanescent light from narrow apertures play a key role in supporting optical disks, which are coated with lubricant and protective film on their flat surfaces in order to keep the gap between the super parallel optical head and the disk surface within several 10 nano meter. Higher throughput efficiency in the near-field semiconductor optical probe array has been obtained in our optical head. However, the obtained evanescent light power is 10 μW from the 100 nm probe aperture, which is one tenth of the power needed to write a bit on the phase change optical disk surface. One solution to get ten times the power is to develop special nano fabricated optical probes of higher throughput efficiency. A metal fine grating fabrication method to get evanescent light wave resonant enhancement is planned after good 2D-FDTD simulation results.抄録全体を表示PDF形式でダウンロード (918K) -
徳丸 春樹2004 年 32 巻 1 号 p. 29-32
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーAlong with progress in digital broadcast waves and popularization of the Internet, broadcast service has continued to evolve past the concept of conventional analogue broadcasting. In conjunction with Internet broadband, providers have begun providing audio and video content. With growth of broadband, the services provided by the two have come to resemble each other. In the age of broadcast/telecommunications, service calls for providing contents. Memories play a huge role in such services, from creation to provision of contents. Memories may be classified as temporary and long-term according to their function; optical memories are ideally suited for long-term storage of data. Performance of optical memories will have to be dramatically enhanced for them to be used as temporary memories.抄録全体を表示PDF形式でダウンロード (157K)
レーザーオリジナル
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西内 健一, 西原 孝史, 山田 昇2004 年 32 巻 1 号 p. 33-37
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーWe carried out a feasibility study on rewritable phase-change optical disks with more than two recording layers. Dynamic recording-playing evaluations of the test disks and Tx measurements revealed the thinning limit of the examined GeSbTe memory film to be 2 nm. The disk with a 2.5-nm thick recording film showed a high transmittance of 77 % at a wavelength of 405 nm, and a CNR of 45 dB. Based on our experimental results, we conclude that at minimum, a quadruple-layer disk for blue lasers will be possible pending some improvements in the maximum output of laser diodes, the sensitivity of optical detectors and the crystallization speed of memory films.抄録全体を表示PDF形式でダウンロード (139K) -
藤 寛, 菊川 隆, 富永 淳二2004 年 32 巻 1 号 p. 38-42
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーBit-by-bit detection is achieved at a recording density of 0.11 μm pits on a super-RENS disk with a platinum oxide layer. Pits and spaces are arranged as a recording pattern for pit position recording. After recording by laser pulses with pre- and post-heating, the pattern is correctly reproduced despite the size smaller than the resolution limit. Furthermore, the pattern is clearly binarized by a read channel circuit for bit-by-bit detection.抄録全体を表示PDF形式でダウンロード (803K)
レーザーオリジナル
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石井 克典, 鈴木-吉橋 幸子, 千原 國宏, 粟津 邦男2004 年 32 巻 1 号 p. 43-47
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーPhosphorylation and dephosphorylation that are most remarkable posttranslational modifications are important to the activation and deactivation of protein in living system. In the first approach, we showed first that it is possible to distinguish a phosphate group in a peptide using Fourier Transform Infrared Spectrometer (FT-IR). In this study, we used Free Electron Laser (FEL) at the wavelength of 9.4 μm corresponding to the peak of infrared absorption spectra derived from a phosphate group in phosphorylated peptides to explore the irradiation effect of FEL on the phosphorylation of a peptide (experimental condition). This study demonstrated that the FEL irradiation had effects of some kind on the organization of infrared absorption of a phosphate group. The promotion of the phosphorylation by FEL irradiation is supposed via the excitation of both protein and phosphate reactant.抄録全体を表示PDF形式でダウンロード (709K) -
佐伯 拓, 今崎 一夫, 本越 伸二, 内田 成明, 藤田 尚徳, 中塚 正大, 井澤 靖和, 吉田 実, 伊藤 秀明, 山中 千代衛2004 年 32 巻 1 号 p. 48-53
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーWe observed laser oscillation for a multimode Nd-doped fiber laser with D-shaped cladding under quasi-solar-pumping simulated by an intense halogen lamp with a color temperature of 5,600 Kelvin. The fiber had a millimeter-scale diameter and was 78 m long, and the doping rate was 3000 ppm of Nd ions in silica core-glass. Results show that the output power obtained was 300 mW when the injected power of the lamplight was 1.1 W at an entrance to the fiber, and the optical-optical conversion efficiency was 27 %. The threshold of laser oscillation is 24 times for the solar constant (0.14 W/cm2), a value which is one order of magnitude lower than the case of crystal lasers reported under solar-pumping.抄録全体を表示PDF形式でダウンロード (524K) -
前薗 好成, 横谷 篤至, 黒澤 宏, 菱沼 宣是, 松野 博光2004 年 32 巻 1 号 p. 54-57
発行日: 2004年
公開日: 2006/03/17
ジャーナル フリーIt has been known that thin silica films can be deposited from TEOS {Si(OC2H5)4} by means of the photo-CVD (Chemical Vapor Deposition) technique using vacuum ultraviolet (VUV) light (VUV-CVD) at room temperature. In this study, in order to develop an advanced technique for this method, we have attempted thin silica film deposition at atmospheric pressure. TEOS was introduced at a partial pressure of 1-2 Torr and the total pressure was adjusted to atmospheric pressure using N2. In the case of deposition at room temperature, many particles with diameters of 1-3 μm were observed on the surface of the deposited films via scanning electron microscopy. By increasing the temperature of the substrate in the range of 50-100 °C, a flat film was successfully obtained. An FT-IR measurement revealed the main component of the deposited films was silica. It was demonstrated that the fabrication of silica film by means of VUV-CVD at atmospheric pressure is possible.抄録全体を表示PDF形式でダウンロード (526K)
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