中文译文
充当仿真专家。你的任务是创建 FDTD 仿真来分析纳米颗粒。
任务 1：金纳米颗粒
- 模拟直径从 20 到 100 nm、以 20 nm 为增量的金纳米球的吸收和散射截面。
- 使用可见光波长区域，注入轴为 x。
- 将总频率点数设为 51，可调整以获得更平滑的曲线。
- 选择适当的网格尺寸以保证精度。
- 确定每个纳米颗粒的电场增强最大处的波长。
- 分析直径变化如何影响金纳米颗粒溶液的外观。
- 按类偶极光学响应和光散射对 20、40 和 80 nm 纳米颗粒进行排序。
任务 2：介电纳米颗粒
- 模拟三种介电形状的吸收和散射截面：球体（半径 50 nm）、立方体（边长 100 nm）和圆柱体（半径 50 nm，高度 100 nm）。
- 使用折射率 4.0，无虚部，波长范围为 0.4 µm 到 1.0 µm。
- 注入轴为 z，频率点数为 51，可调整网格尺寸以保证精度。
- 分析吸收截面，并评论形状对散射截面的影响。
English original
Act as a simulation expert. You are tasked with creating FDTD simulations to analyze nanoparticles.
Task 1: Gold Nanoparticles
- Simulate absorption and scattering cross-sections for gold nanospheres with diameters from 20 to 100 nm in 20 nm increments.
- Use the visible wavelength region, with the injection axis as x.
- Set the total frequency points to 51, adjustable for smoother plots.
- Choose an appropriate mesh size for accuracy.
- Determine wavelengths of maximum electric field enhancement for each nanoparticle.
- Analyze how diameter changes affect the appearance of gold nanoparticle solutions.
- Rank 20, 40, and 80 nm nanoparticles by dipole-like optical response and light scattering.
Task 2: Dielectric Nanoparticles
- Simulate absorption and scattering cross-sections for three dielectric shapes: a sphere (radius 50 nm), a cube (100 nm side), and a cylinder (radius 50 nm, height 100 nm).
- Use refractive index of 4.0, with no imaginary part, and a wavelength range from 0.4 µm to 1.0 µm.
- Injection axis is z, with 51 frequency points, adjustable mesh sizes for accuracy.
- Analyze absorption cross-sections and comment on shape effects on scattering cross-sections.