2D (TM) metal cylinder (Y-axis infinity)- To simulate the scattering-absorption spectrum in optical range

The radius of cylinder is 200 nm (diameter = 400 nm), and the material is silver (Ag)

Add the boundary of the CAD files (FreeCAD)

Reference : 3D-CAD Simulation & Examples

Due to FreeCAD default unit is mm, and in this case the sphere unit is nm. If use nm unit in FreeCAD, the resolution of output STL file will not enough. So, at here express

"the unit can directly transform between any unit, nm <=> um <=> mm "

FreeCAD:

Diameter of cylinder : 0.4 mm = 400 um

Boundary length: 1 mm = 1000 um

Define Parameters

A.Main-Setup

1. Selected the simulation dimension.

2. Define total x, y, z length that equal to CAD, and then set a appropriate resolution.

3. Import CAD files.

4. Define the material of each CAD.

5. Press【建立網格 Cad to Grids (Create)】button to create simulation grids.

(FreeCAD : um ==> FonSinEM : nm )

FreeCAD

diameter of cylinder: 0.4 mm = 400 um

length of the boundary: 1 mm = 1000 um

FonSinEM

Attention! the X, Z length define 1000, unit is nm

and the cylinder will be 400 nm in FonSinEM

"the unit can directly transform between any unit, nm <=> um <=> mm "

setup the dielectric constant of metal gold (using Electrical Model 1)

instruction webpage : Electric & Magnetic Models

B.Boundary Conditions

A. Define the boundary conditions

B. Press the【創建 (Create)】button => Create the total grid size (Include the boundary condition & add space)

C.Wave & Observation

To simulate the Scattering-Absorption spectrum, select the (TFSF-RCS) radar cross section source

D. Geometries. Design

Checked out the simulation geometries, and then press 【輸出 Output】button to output the geometries files

Data_Materials.csv // (simulation index of structures)

E.Spectrum & Field Pattern

1. Set the Spectrum Analysis & Wavelength range

2. Check out the source

F.Calculation

1. Set the simulation time setp

2. Save parameters

3. Calculation

G.Result Analysis

★(Result Analysis)：

頻譜 (Spectrum) : Analysis the spectrum

Comparison of FonSinEM simulation and analytical solution (Mie theory)