任意形状结构非局部光学特性的计算
Calculating Nonlocal Optical Properties of Structures with Arbitrary Shape
摘要：
在最近的一封信[物理。103，097403（2009）]，我们概述了一种计算具有空间非局域介电函数的结构的光学性质的计算方法。在这篇文章中，我们详细介绍了完整的方法，并验证它对圆柱形纳米线的分析结果。然后，作为我们的方法的例子，我们计算的光学性质的金纳米结构在一个，两个和三个维度。我们首先计算了薄膜的透射、反射和吸收光谱。由于它们的简单性，这些系统清楚地展示了非局域效应的纵向（或体积）等离子体激元特征，这导致了异常吸收和等离子体激元蓝移。然后，我们研究了球形纳米粒子的光学性质，这也表现出这种非局部效应。最后，我们比较了不同形状纳米线周围的最大和平均电场增强与局部理论预测。我们证明，当包括非局部效应，这些属性可以发生显着下降。
英文摘要：
In a recent Letter [Phys. Rev. Lett. 103, 097403 (2009)], we outlined a computational method to calculate the optical properties of structures with a spatially nonlocal dielectric function. In this Article, we detail the full method, and verify it against analytical results for cylindrical nanowires. Then, as examples of our method, we calculate the optical properties of Au nanostructures in one, two, and three dimensions. We first calculate the transmission, reflection, and absorption spectra of thin films. Because of their simplicity, these systems demonstrate clearly the longitudinal (or volume) plasmons characteristic of nonlocal effects, which result in anomalous absorption and plasmon blueshifting. We then study the optical properties of spherical nanoparticles, which also exhibit such nonlocal effects. Finally, we compare the maximum and average electric field enhancements around nanowires of various shapes to local theory predictions. We demonstrate that when nonlocal effects are included, significant decreases in such properties can occur.
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