论文标题
血浆中非局部性的平行FDTD建模
Parallel FDTD modelling of nonlocality in plasmonics
论文作者
论文摘要
随着纳米制作技术变得越来越精确，特征大小越来越小，在等离震源中对非本地效应进行建模的能力变得越来越重要。尽管已经使用各种计算电磁技术实施了基于流体动力学的非局部模型，但有限差分时间域（FDTD）版本仍然难以捉摸。在这里，我们提出了非本地流体动力学的全面实施，包括用于并行计算。由于要解决非本地效应需要子纳米计的步骤大小，因此平行实现使非本地FDTD的计算成本更加负担得起。我们首先验证了小球形金属颗粒的算法，并发现非局部性在金属表面上涂抹楼梯伪像，从而提高了局部模型的准确性。我们也发现了较大的纳米结构，并发现了这一点。该模拟的大尺寸显然存在非局部效应，突出了FDTD中并行实现的重要性和影响。
As nanofabrication techniques become more precise, with ever smaller feature sizes, the ability to model nonlocal effects in plasmonics becomes increasingly important. While nonlocal models based on hydrodynamics have been implemented using various computational electromagnetics techniques, the finite-difference time-domain (FDTD) version has remained elusive. Here we present a comprehensive FDTD implementation of nonlocal hydrodynamics, including for parallel computing. As a sub-nanometer step size is required to resolve nonlocal effects, a parallel implementation makes the computational cost of nonlocal FDTD more affordable. We first validate our algorithms for small spherical metallic particles, and find that nonlocality smears out staircasing artifacts at metal surfaces, increasing the accuracy over local models. We find this also for a larger nanostructure with sharp extrusions. The large size of this simulation, where nonlocal effects are clearly present, highlights the importance and impact of a parallel implementation in FDTD.
