Learning Forum

[gcharalampous]

Greetings,

I am currently engaged in research involving the Electro-optic Effect, focusing on calculating the static electric field across my waveguide in LUMERICAL Charge. The waveguide's cross-section aligns with the XZ axis, resulting in a 2D y-normal E-field monitor type. My objective is to optimize the configuration and placement of metal electrodes while determining the appropriate oxide thickness based on the varying magnitude of the E-field across different points within the waveguide.

I aim to extract the E-field vector data (Etotal, Ex, and Ez) and plot them in Python, resembling a quiver plot, to comprehend the direction and magnitude of the E-fields. However, the E-fields comprise a 1D array, while my E-field monitor is a 2D array. Are the E-fields sliced? If so, in which direction across the X or Z axis are they sliced?

Thank you for any assistance or insights you may provide.

Warm regards,  
GC

[Guilin Sun]

The data is not sliced. instead, it is from the finite element meshing that makes it 1D. You will need to interpolate it into 2D graph: 

interptri - Script command

it has example script file for reference.

[gcharalampous]

 

Thank you, Guillin, for the fast reply. That was the function I was missing. I do have one last question.

I believe I have successfully interpolated the E-field from the 1-D triangular grid to the rectilinear 2-D grid. This is the interpolated E-field:

And this is the E-field I can visualize from the Lumerical 2D data visualizer:

 

 

I believe the two plots look quite similar. I understand they differ in terms of grid size, number of points, scale, etc. However, the main difference I notice is that in the interpolated plot, the E-field appears infinite inside the metal conductors. In the Lumerical plot from the visualizer, the E-field is zero in the metal conductor. The E-field should be zero inside the conductor according to Ohm’s law. Is it a numerical error coming from the interptri script command function?

 

 

 

 

[Guilin Sun]

I agree with you. AS you know, zero E fields inside metal is theory, whereas the interpolation is pure math. It just uses the results from neighbour elements to get some values, regardless the physics.

Therefore I believe it is numerical error.