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根据强非局域介质构成的平面介质波导中同频率和同极化的多光束共同传输模型方程,求得了任意斜入射多光束相互作用的精确解析解。基于强非局域介质空间双光孤子的相互作用原理,提出了利用全同孤子作为信号光来实现全光互联,但实现的逻辑也仅仅局限于短距离作用,还对全光开关抑或反相器作了详细叙述,通过实例给出了这类设计的优化方案。 相似文献
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Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn_(1/3)Nb_(2/3))O_3-0.09PbTiO_3 single crystals 下载免费PDF全文
0.91Pb(Zn1/3Nb2/3)O3--0.09PbTiO3 (PZN--9%PT) single crystals with different orientations are investigated by using a spectroscopic ellipsometer, and the refractive indices and the extinction coefficients are obtained. The Sellmeier dispersion equations for the refractive indices are obtained by the least square fitting, which can be used to calculate the refractive indices in a low absorption wavelength range. Average Sellmeier oscillator parameters Eo, $\lambda$o, So, and Ed are calculated by fitting with the single-term oscillator equation, which are related directly to the electronic energy band structure. The optical energy bandgaps are obtained from the absorption coefficient spectra. Our results show that the optical properties of [001] and [111] poled crystals are very similar, but quite different from those of the [011] poled crystal. 相似文献
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利用小分子电催化氧化反应耦合水解制氢不仅有助于降低阳极反应过电位,提高析氢反应(HER)效率,而且产生高附加值的化学品,是提升电催化水分解性能的有效策略.其关键是开发具有高导电性和低氧化电位的非贵金属电催化剂.以Ni(OH)2纳米片为前驱物,通过退火氮化工艺,制备了具有低氧化电位和高导电性的金属相Ni3N纳米颗粒(Ni3N-NPs).与Ni(OH)2相比,Ni3N-NPs具有较小的法拉第电阻,更低的氧化电位(1.36 V时达到10 mA·cm-2),较小的Tafel斜率(29 mV·dec-1),表现出更好的乙二醇(EG)电催化氧化性能.在1.36 V时,Ni3N-NPs电催化氧化EG生成甲酸盐的法拉第效率高达91.16%.通过X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)对反应前后Ni3N-NPs结构进行详细表征发现,在电催化EG氧化过程中,Ni3 相似文献
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超颖表面是一种基于亚波长结构的光学平板膜层,可在亚波长传输范围内调控入射光束的相位、振幅和偏振。为了代替传统的曲面光学元件,采用传输相位调控理论和广义折反射定律,设计了一种新型的超颖表面,并进行了程序模拟,取得了此亚波长结构对光束聚焦调控的数据。结果表明,当增加超颖表面的椭圆基元的长短轴长度时,材料的等效折射率增加,并且适用的波长范围增加到0.7μm~1.2μm;通过优化超表面结构参量,可实现在宽波带范围内的相位调控,进而获得聚焦光场的优化,在一定程度上可以代替传统光学元件实现光学聚焦。该研究结果在超分辨率成像及光刻等方面有一定参考价值,在一些特殊的需要亚波长结构调控光束的情况下可以使光路简单化,并且比传统的光学元件有着厚度方面的优势。 相似文献
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We investigate the existence and stability of surface defect gap solitons at an interface between a defect in a two-dimensional optical lattice and a uniform saturable Kerr nonlinear medium. The surface defect embedded in the two-dimensional optical lattice gives rise to some unique properties. It is interestingly found that for the negative defect, stable surface defect gap solitons can exist both in the semi-infinite gap and in the first gap. The deeper the negative defect, the narrower the stable region in the semi-infinite gap will be. For a positive defect, the surface defect gap solitons exist only in the semi-infinite gap and the stable region localizes in a low power region. 相似文献
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