1. Waveguide Simulation
using MODE solutions

2. MODE Solutions Download trial version  https://www.lumerical.com/
Need official
for download

3. How to download
Need official
for download

4. How to download

5. How to download

6. License setting

7. Waveguide Simulation Finite Difference Time Domain (FDTD)
Numerical method of solving Maxwell equation
3D FDTD
Accurate
Slow
2D FDTD
2.5D FDTD
2D FDTD with effective index method
Fast
Approximation

8. Waveguide Simulation Eigenmode solver
Solution method in a cross-section of waveguide geometry
Solve Maxwell equations for cross-sectional mash

9. MODE Solutions Lumerical MODE Solutions Eigenmode solver
Propagation solver (2.5 FDTD)

10. MODE Solutions Make account at Lumerical homepage Download license
Don’t run program at home
4/3 Class at A125(computer lab)
Bring USB with downloaded license

11. MODE Solutions Drawing structure Example) Make strip waveguide
Height: 220 nm
Width: 500 nm
Length: 30 μm
Core material: Si
Cladding material: SiO2

12. MODE Solutions

13. MODE Solutions
Parameter can be predetermined here(material, number)

14. MODE Solutions Code for make cladding Geometry set x, x span
z min, z max

15. MODE Solutions
Result of cladding

16. MODE Solutions Include core # Material setting
material_cladding = "SiO2 (Glass) - Palik";
material_core = "Si (Silicon) - Palik";

17. MODE Solutions
Result

18. MODE Solutions
Solver

19. MODE Solutions
Run simulation

20. MODE Solutions

21. MODE Solutions

22. Example Make rib waveguide Core: Si Cladding: SiO2 500nm 130nm 220nm

23. Example
Find the group and phase velocity of light for the fundamental TE mode in the following waveguides -rib waveguide, 220 nm thick, 500nm with at 1550 nm, 90 nm slab
What is the single-mode condition for the strip waveguide TE mode?
-220nm thick, 500nm width, at 1550nm
What is the maximum width for the strip waveguide before it supports more than one mode?