| Project/Area Number |
14550304
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Chitose Institute of Science and Technology |
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Principal Investigator |
YOSHIDA Junichi Chitose Institute of Science and Technology, Faculty of Phonic Science, Professor, 光科学部, 教授 (40316295)
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| Co-Investigator(Kenkyū-buntansha) |
王 麗莉 千歳科学技術大学, 光科学部, 訪問研究員
ZHANG Gong jian Chitose Institute of Science and Technology, Faculty of Phonic Science, Assistant Professor, 光科学部, 助教授 (00305955)
KOBAYASHI Soichi Chitose Institute of Science and Technology, Faculty of Phonic Science, Professor, 光科学部, 教授 (80326595)
WANG Li li Chitose Institute of Science and Technology, Faculty of Phonic Science, Researcher
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | photonic IP-routing / photonic networks / photonic devices / optical logic gate / polymers / optical waveguide / nonlinearity / photocromism / 偏波依存性 / スピロピラン / 波長変換 |
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| Research Abstract |
Recently, DNA-surfactant complexes have attracted much attention due to their functionality produced by the doping of various organic dyes. Especially, the photochromic effect in DNA-surfactant complexes have been expected to add a new functionality, such as ultra-fast optical switching, logic circuits, memory, etc., for next generation lightwave systems.
With the aim of clarifying capability of such materials, we have studied optical characteristics, such as refractive indices, absorbance and fluorescence intensity, and photochromic properties, of spiropyran-doped DNA-cetyltrimethilammonium (OTMA) complex films, which have been derived from marine biopolymers. It was found that absorption and fluorescence spectral intensity of those films strongly depend on the DNA concentration, while the refractive index showed very small changes. The change is due to the molecular structure change by the photochromic nature of spiropyran. We have made a preliminary study on switching characteristics of the spiropyran doped DNA-CTMA film. By using the photochromic nature of the spiropyran, an entry data written by 360 nm lights can be readout as a signal of 620 nm lights when a 520 nm light is irradiated on the film. Fundamental operation was confirmed with transition times of several tens millisecond. Although much precise measurement should be necessary, these results indicated potential use of DNA-CTMA films.
Furthermore, we tested the reproducibility of the photochromic change of the spiropyran doped DNA-CTMA films for more than 300 times of the on-off cycle, and confirmed no degradation in the fluorescence intensity.
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