2003 Fiscal Year Final Research Report Summary
Development of an optical storage system of semiconductor nanocxystal thin film
| Project/Area Number |
13355030
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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 |
化学工学一般
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAGUCHI Yukio The University of Tokyo, Graduate school of Engineering, Professor, 大学院・工学系研究科, 教授 (20332570)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUI Isao Toshiba Corporation, Senior Researcher, 主任研究員
MAENOSONO Shinya The University of Tokyo, Graduate school of Engineering, Research Associate, 大学院・工学系研究科, 助手 (00323535)
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| Project Period (FY) |
2001 – 2003
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| Keywords | semiconductor nanoparticles / opticla memory effect / optical memory media / nanotechnology / self-ordering / confocal laser scanning microscopy |
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| Research Abstract |
The principle and the mechanism of the optical memory using semiconductor nanoparticles are studied for developing an optical memory media. The fabrication process is also studied. It was already discovered by our previous works that the intensity of photoluminescence of thin films consisting of semiconductor nanoparticles increases with irradiating time of UV light. The only way to control the intensity of photoluminescence was the irradiating period. Therefore, the application of an optical memory was limited.
We discovered that the increase ratio of the photoluminescence can be controlled by the intensity of irradiating light. The weak light can enhance the increase ratio more than the strong light. This result shows the possibility of multi-value recordings by controlling the intensity of irradiating light. Since the increase of photoluminescence is reversible, the multi-value recording is rewritable. It is concluded that higher density rewritable media than current double- value re
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cording such as 0 and 1 can be produced. The multi-value recordings and their reading can be done by a single wave of light. Therefore, a simple reading device is expected by employing a same optical head to both write and erase.
A wet process must be developed in order to fabricate thin films of nanoparticles for large area and with high speed coating. The surface force on a particle and the Brownian force become dominant for smaller particles. However, those effects on the self-ordering of particles are not well understood experimentally. We have carried out the particle self-ordering during drying with considering the interaction forces among particles through the liquid surface. Then we realized that the self-ordering can be categorized to three patterns : (1) crystals such as hexagonal or tetragonal ordering, (2) random aggregates, and (3) dispersed crystals like a colonic crystal. Especially, the ordering state obtained from our model suggests that we can fabricate the thin films highly ordered by wet processes. This method can be applied to not only the fabrication of thin films of semiconductor nanoparticles but also other broad technology area. Less
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Research Products
(13 results)
