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首页> 外文期刊>繊維学会誌 >Phase-Matched Second-Harmonic Generation from Five-Layer Langmuir-Blodgett Film Waveguides with Large Fabrication Tolerance and Overlap Integral for Mode Conversion
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Phase-Matched Second-Harmonic Generation from Five-Layer Langmuir-Blodgett Film Waveguides with Large Fabrication Tolerance and Overlap Integral for Mode Conversion

机译：五层Langmuir-Blodgett薄膜波导的相位匹配二次谐波产生，具有较大的制造公差和重叠积分以进行模式转换

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摘要

The five-layer waveguide composed of Langmuir-Blodgett films were prepared from combination of low molecular weight amphiphilic NLO dye, n-Docosyl-4-nitrophenylurea (DONPU) and SHG inactive polymer. The NLO dye was deposited as y-type LB films. The SHG efficiency of this film was dominated by the contribution from in-plane components such as d_(33). Other tensor components are almost negligible. The second NLO layer was deposited on PDiPF films after reversing the dipping direction to introduce the inversion of the nonlinear susceptibilities across the film. By selecting the proper combination of the SHG inert layer and SHG active layers the mode dispersion curves were compensated to have the same slopes. In fact there are four intersections of the mode dispersion curves, a very good thickness tolerance for phase-matching can be expected. Five-layer organic waveguides prepared by Langmuir-Blodgett techniques exhibit high overlap integral as well as large fabrication tolerance of thickness up to 56 nm. This large fabrication tolerance for phase-matching is 8.6 times larger than that of conventional three layer waveguide.
机译：由低分子量两亲性NLO染料，正二十烷基-4-硝基苯基脲（DONPU）和SHG惰性聚合物的组合制备了由Langmuir-Blodgett膜组成的五层波导。将NLO染料沉积为y型LB膜。该薄膜的SHG效率主要受平面内分量（例如d_（33））的影响所支配。其他张量分量几乎可以忽略不计。在反转浸渍方向后，将第二NLO层沉积在PDiPF薄膜上，以引入整个薄膜的非线性磁化率反转。通过选择SHG惰性层和SHG有源层的适当组合，可以将模式色散曲线补偿为具有相同的斜率。实际上，模式色散曲线有四个相交点，可以期望有很好的厚度匹配相位匹配性。通过Langmuir-Blodgett技术制备的五层有机波导表现出高重叠积分以及高达56 nm的较大制造公差。这种大的相位匹配制造公差是传统三层波导的8.6倍。

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