2004 Fiscal Year Final Research Report Summary
High density optical data storage using a medium which has photonic crystal structures
| Project/Area Number |
15360028
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Shizuoka University |
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Principal Investigator |
KAWATA Yoshimasa Shizuoka University, Faculty of Engineering, Professor, 工学部, 助教授 (70221900)
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| Co-Investigator(Kenkyū-buntansha) |
KANEKO Toru Shizuoka University, Faculty of Engineering, Professor, 工学部, 教授 (50293600)
IWATA Futoshi Shizuoka University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30262794)
WATANABE Osamu Toyota Central Research Labs.Inc., Frontier Group, Chief Researcher, フロンティア第3グループ, 主任研究員 (20374085)
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| Project Period (FY) |
2003 – 2004
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| Keywords | multi-photon excitation / high density storage / Photonic crystal / optical microscopy / photopolymer / adhesives / photobleaching / optical control |
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| Research Abstract |
Three-dimensional optical memory has been developed by many researchers because it can overcome the density limit determined by the diffraction of light wave. In order to increase the density in the axial direction, we have developed a mltilayered recording medium in which photosensitive thin films and nonphotosensitive transparent films were stacked alternately. Since the photosensitive films were thinner than the depth of focus of the recording beam, the spatial frequency distribution of the recorded bit was extended in the axial direction. We have developed the fabrication of photonic crystal structures in the recording medium to achieve higher resolution and contrast.
In the case of recording are arranged in the form of hexagonal arrays, the shape of a recorded bit in a structured medium is determined by the products of squared intensity of the focused beam and the structure of the patterned medium. Its frequency distribution is given by convolution of the frequency distribution of the squared spot intensity and that of the patterned medium. As a result, each individual bit in the patterned media contains higher spatial frequency components. We succeeded in recording bits with a 0.5μm interval in particular plane and 2.0μm interval between successive layers. Thus, storage density of 2.0Tbits/cm3 is achieved.
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