| Project/Area Number |
15360193
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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 |
Electron device/Electronic equipment
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| Research Institution | KUMAMOTO UNIVERSITY |
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Principal Investigator |
IKUNO Hiroyoshi Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (80040400)
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| Co-Investigator(Kenkyū-buntansha) |
YATA Akira Kumamoto University, School of Health Science, Professor, 医学部, 教授 (90040435)
KUBOTA Hiroshi Kumamoto University, Shock Wave and Condeased Matter Research Center, Professor, 衝撃・極限環境センター, 教授 (20170037)
NAKADA Akira Kumamoto University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60302650)
NAKA Yoshihiro Kumamoto University, Graduate School of Science and Technology, Research Associate, 大学院・自然科学研究科, 助手 (30305007)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 2004: ¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 2003: ¥3,300,000 (Direct Cost: ¥3,300,000)
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| Keywords | photonic crystal / bent waveguide / branching waveguide / optical circuit device / multidimensional wave digital filters / FD-TD method |
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| Research Abstract |
We have analyzed the characteristics of sharply bent optical waveguides constructed by two-dimensional photonic crystal of circular air-holes in silicon on a triangular array numerically. The highly efficient bent waveguides are the key devices to realize compact integrated optical circuits. The method of solution is finite-difference time-domain(FD-TD) method based on the principles of multidimensional wave digital filters ; this method can easily be implemented and is more accurate than the conventional one, the Yee algorithm.
First, we have checked the dispersion relation of the waveguides and confirm the performance of a single mode propagation that is attained in the cutoff frequencies of higher-order modes. We have calculated the design parameter of photonic crystal to maximize the bandwidth of single mode region. Next, we have proposed a reflection-free sharply bent waveguide with the microcavity. We have shown that reflected waves from the sharply corner can be completely eliminated by the microcavity due to resonant tunneling and shown that transmission bands can be controlled by changing structure of the microcavity. Next we have also analyzed the branching waveguide with the microcavity and shown that loss-less power dividing can be realized. Finally, we have fabricated the photonic crystal waveguide on a silicon-on-insulator(SOI) wafer. The waveguide patterns are defined by electron beam writer. We have checked the accuracy of waveguide pattern and optimized the fabrication condition.
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