1999 Fiscal Year Final Research Report Summary
Development of Ultra-high Density Three-dimensional Optical Data storage System
| Project/Area Number |
09355008
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Intelligent mechanics/Mechanical systems
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| Research Institution | The University of Tokushima |
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Principal Investigator |
MISAWA Hiroaki Grad. School of Eng., The Univ. of Tokushima, Professor, 大学院・工学研究科, 教授 (30253230)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Yoshihisa Opto-Technology Laboratory, The Furukawa Electric co., Ltd., Section Manager, 光技術研究所機能材料研究室, 室長
MATSUO Shigeki Fac. Of Eng., The Univ. of Tokushima, Research Associate, 工学部, 助手 (20294720)
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| Project Period (FY) |
1997 – 1999
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| Keywords | three-dimensional optical data storage / three-dimensional optical memory / silica glass / femtosecond pulse / change in refractive index / anneal / multiphoton process / luminescence |
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| Research Abstract |
Optical data storage systems, such as CD and DVD, are now widely used. However, capacity of such currently available storage systems are not enough for recording movies in a high-quality even the storage densities are almost reaching to the theoretical limit. Accordingly a new data storage system is required. We have developed three-dimensional (3D) optical data storage system using silica as recording material, and clarified the following points :
1. By irradiation of picosecond or femtosecond single pulse, a change in reflactive index is induced in a small domain (reffered as "bit") through a multiphoton process. Using such an effect, a three-dimensional data storage system can be constructed.
2. The time-period to generate a bit was about 400 ps.
3. A small hollow was generated at the center of the bit.
4. The bits are thermally stable extremely ; by annealing at 1150 degree no change was induced in optical microscope image.
5. The bits showed a specific luminescence spectra. The luminescence intensity was reduced by thermal annealing ; by annealing at 500 degree the luminescent property was almost lost.
6. For multi-layer recorded samples, each layer was independently read by both transmission and luminescence images.
7. In the other materials such as PMMA, the same effect was found.
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