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Development of optical second-order nonlinear optical material made of metallic nanowire arrays

金属纳米线阵列光学二阶非线性光学材料的研制

基本信息

批准号：
16510083
负责人：
MIZUTANI Goro
金额：
$ 2.69万
依托单位：
Japan Advanced Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

We have observed optical second harmonic generation (SHG) from metallic nanowire arrays for the first time. We used Au nanowires of 60nm width on facted NaC1 (110) faces fabricated by shadow deposition method. From the polarization and photon energy dependence, we have found that Au behaves as an ideal metal and its optical property is dominated by the effect of the depolarization field for the photon energy below 1.5eV.We have fabricated Pt nanowire arrays of 9nm and 20nm widths and have observed their SH response. The SH response was anisotropic due to the anisotropic shapes of the cross sections of the nanowires caused by the low mobility of Pt atoms during wire growth. The second-order nonlinear susceptibility element X^<(2)>_<222> was found to be large, where 2 represents the direction perpendicular to both the nanowire axes and the array planes. The specific feature of the Pt nanowires is that the cross section has an anisotropic shape and the poor dielectric shielding due to the large imaginary part of the dielectric function.We have observed SHG from Cu nanowire arrays with the wire widths of 14 to 19nm, in order to generalize this study to other metallic species. The dielectric and nonlinear optical properties of Cu nanowires could be explained by using a local plasmon model and were reproduced by electromagnetic numerical calculation incorporating the retardation effect. The response of the nanowires is that of a local plasmon when the incident field is perpendicular to the nanowire axes, while it is described by lightning-rod effect when the incident field is parallel to the nanowire axes.From the results of these works we could pick up at least three types of nonlinear effect of metallic nanowires, and have contributed considerably to the understanding of the nonlinear optical effect of metallic nanostructures.

我们首次观察到金属纳米线阵列的光学二次谐波产生（SHG）。我们在通过阴影沉积法制造的NaC1（110）面上使用了60nm宽的Au纳米线。从偏振和光子能量依赖性来看，我们发现Au表现得像一种理想金属，对于低于1.5eV的光子能量，其光学性质主要受去偏振场的影响。我们制备了9nm和20nm宽度的Pt纳米线阵列，并观察了它们的SH响应。 SH 响应是各向异性的，因为在线生长过程中 Pt 原子的低迁移率导致纳米线横截面的各向异性形状。发现二阶非线性磁化率元素X^<(2)>_<222>很大，其中2表示垂直于纳米线轴和阵列平面的方向。 Pt纳米线的具体特征是横截面具有各向异性形状，并且由于介电函数虚部较大而导致介电屏蔽较差。我们从线宽为14至19nm的Cu纳米线阵列中观察到了SHG，以便将这项研究推广到其他金属物种。铜纳米线的介电和非线性光学特性可以通过使用局部等离子体模型来解释，并通过结合延迟效应的电磁数值计算来重现。当入射场垂直于纳米线轴时，纳米线的响应是局域等离子体激元的响应，而当入射场平行于纳米线轴时，纳米线的响应是由避雷针效应描述的。从这些工作的结果中，我们可以发现至少三种类型的金属纳米线的非线性效应，并且对理解金属的非线性光学效应做出了很大贡献。纳米结构。