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Effects of structural parameters in metallic nano slit arrays

机译：金属纳米缝阵列中结构参数的影响

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Nano slit arrays perforated on thin metallic film are the basic structure of metallic nano-optic lenses, which resemble the shape of the conventional glass lens, and can be applied to beam manipulation, such as beam reflecting/deflecting or focusing. It has been proven that optical transmission is feasible through metallic nano slit arrays, making new nano technology applications possible. In conventional dielectric lenses, the edge effect—the very strong diffraction of the transmitted beam that take place at the lens edges restricts the possibility of sizing down the conventional optics components to a sub-wavelength range. This is due to the fact that the size of the lens is an important determinant of focusing beam to the nano scale.rnIn this paper we present the metallic nano lenses and study their optical transmission properties. These lenses do not suffer from the edge effect mentioned above. The phase of each nanoslit element can be managed by changing the material of the metal film and/or the structural parameters of the lens. In our simulation work, we examine the transmission performance of metallic nano slit arrays by the method of finite-difference time-domain (FDTD). We use various metals such as copper, silver, aluminum and titanium as the material of the thin films. We also investigate various structural parameters such as slit number, width and thickness, to show their influence on the optical transmission performance. By adjusting the material and/or structural parameters of the Nano slit arrays, the desired transmission performance can be realized.
机译：穿孔在金属薄膜上的纳米狭缝阵列是金属纳米光学透镜的基本结构，类似于传统的玻璃透镜的形状，可应用于光束操纵，例如光束反射/偏转或聚焦。已经证明，通过金属纳米缝隙阵列进行光传输是可行的，这使得新的纳米技术应用成为可能。在常规的介电透镜中，边缘效应（在透镜边缘发生的透射光束的非常强的衍射）限制了将常规光学组件缩小到亚波长范围的可能性。这是由于透镜的尺寸是聚焦光束到纳米级的重要决定因素。在本文中，我们介绍了金属纳米透镜并研究了它们的光学透射特性。这些镜片没有上述边缘效应。每个纳米狭缝元件的相位可以通过改变金属膜的材料和/或透镜的结构参数来控制。在我们的仿真工作中，我们通过有限差分时域（FDTD）方法检查了金属纳米缝隙阵列的传输性能。我们使用各种金属，例如铜，银，铝和钛作为薄膜的材料。我们还研究了各种结构参数，例如缝数，宽度和厚度，以显示它们对光传输性能的影响。通过调节纳米缝阵列的材料和/或结构参数，可以实现期望的透射性能。

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