| Project/Area Number |
06452135
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Keio University |
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Principal Investigator |
UMEGAKI Shinsuke Keio University, Material Science, Professor, 理工学部, 教授 (70011161)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Keisuke Keio University, Material Science, Professor, 理工学部, 教授 (00051425)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1994: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | Langmuir-Blodgett Film / Second-harmonic generation / Nonlinear optics / Organic materials / Planar waveguides / N-dococyl-N^1- (4-nitrophenyl) urea |
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| Research Abstract |
We studied Langmuir-Blodgett (LB) films in a viewpoint of thickness control of top layrs on guideing layrs of organic nonlinear-optical crystals. The LB film as a top layr can be stacked layr by layr and the thickness can be precisely controlled, since, generally, on LB layr has thickness of nm-order. In the research, by means of stacking LB layrs, we experimentally achieved optical second-harmonic generation (SHG) under the condition of thickness-controlled phase-matching with practcally large tolerance and theoretically designed how to obtain larger tolerance in guided-to-guided mode SHG for given thickness of the guiding layre.
In the experiment, we tried to stack Z-type LB layrs of N-dococyl-N^1- (4-nitrophenyl) urea (DONPU) on the inorganic nonlinear-optical LiTaO_3 epitaxially grown on the inorganic LiNbO_3 substrate. As a result, we could attain SHG under the tolerable phase-matching within a thickness range of 45 nm of the LiTaO_3 layr, which is wide enough in comparison with the usual thickness range of 1 nm-order. We also found that the stearic acid has to be used as the intermediate layr on the LiTaO_3, since DONPU can be stacked on the hydrophobic substrate.
In the theory, we treated the organic nonlinear-optical (-) 2- (alpha-methylbenzylamino) -5-nitrophyridine (MBANP) and 3,5-dimethyl-1- (4-nitrophenyl) pyrazole (DMNP) as the guiding layrs on the glass substrates with the appropriate buffer layrs. We could predict that the wide thickness-range of the guiding layr can provide the tolerably phase-matched SHG,where the phase matching is controlled by stacking the DONP film layr by layr according to the thickness of the guiding layr.
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