成果報告書詳細
管理番号20150000000539
タイトル*平成26年度中間年報 エネルギー環境先導プログラム データセンタの省電力化を実現する大容量・高速光アーカイブシステムの研究開発
公開日2015/8/26
報告書年度2014 - 2014
委託先名学校法人東京理科大学 特定非営利活動法人ナノフォトニクス工学推進機構 三菱化学株式会社 大日本印刷株式会社
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Research and development of large capacity and high transfer rate optical archive system for reduction of power consumption in data center

Annual report 2014

(1) Investigation of high density multiplexing technique
(Tokyo University of Science)
In the holographic data storages (HDS), the DC-component in the signal beam wastes the dynamic range of the recording medium. In order to reduce the DC-component, phase mask with odd-shaped surface is used for the randomization of the phase. We had investigated and optimized the phase mask pattern which can reduce the DC-component and suppress the reduction of the signal-to-noise ratio (SNR) with numerical simulations. We clarified that randomization per block of the modulation code may suppress the reduction of the SNR in comparison to bit-by-bit randomization.

(2) Foundational examinations of input-output devices using a dressed photon technology
(Specified Nonprofit Corporation Nanophotonics Engineering Organization)
Enhancements of their photo-sensitivities of Si photodetectors were experimentally confirmed by the dressed photon annealing. 30% quantum efficiencies of the Si photodetectors became very sensitive photodetectors with a quantum efficiency more than 100% by the dressed photon annealing.
The most serious problems for the device-integration of ultra-high speed multivalued ZnO modulators and for the Si high-sensitive photodetectors is crosstalk. In order to estimate the crosstalk of them, the circuit boards was designed for 2-dimentional arrayed devices of them. The circuit board size was a 20 mm square. First, 2×2 = 4 pixels devices and then 4×4 = 16 pixels devices will be fabricated using the designed circuit board. Here, the special electrode was also placed on the circuit board to apply the bias current for the dressed photon annealing.

(3) Development of the photopolymer material for high density recording
(Mitsubishi Chemical Corporation)
For enhancing a recording capacity of a holographic media comprising a photopolymer system the free radical polymerization reaction initiated by the recording light exposure should be spatially controlled to keep the visibility of the gratings high. In the photopolymer systems, the radical polymerization reaction for the grating formation depends on the concentration and the diffusion constant of polymerizable monomer, the concentration and the diffusion constant of the chain transfer agent, and the re-initiation reaction rate constant of the chain transfer agent. In this fiscal year, we chose the following chemical compounds as the candidate chain transfer agents for controlling the polymerization reaction in photopolymer systems; 1) alkyl halides, 2) thiols, 3) naphthoquinones and 4) stable radicals (TEMPO, O2).

(4) Development of multiple-valued phase/amplitude recording
(Dai Nippon Printing Co., Ltd.)
HDS has the potential of multiple-valued recording using the phase and amplitude modulation. We had developed numerical simulator based on the scalar diffraction theory which evaluate the available multiple number of multiple-valued phase/amplitude recording in our optical system.

(5) Organization of the research and development committee
(Specified Nonprofit Corporation Nanophotonics Engineering Organization)
The research and development committee is being arranged. Project planning committee and market development committee are also being comprised, and we are choosing committees.
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