Hi @simonspa,
Thank you for the quick reply!
Regarding 2. I understand that the weighting field is unique for each electrode and that it is translated to each electrode in the simulation, but maybe I formulated it badly. By full weighting field I meant its full spatial width and depth in XY, since it only plots the weighting field for the (1,1) pixel and its extent to one pixel over, whilst the loaded one extends 7 pixels in each directions. I assume that the weighting field is plotted only for the (1,1) pixel and the spatial coordinates in the plot only extends to the neighboring pixels, and that the full extent of the weighting field for the pixel is used in the simulations?
And for 3. The weighting field does not extend significantly, but it is necessary for us to take at least 3-4 in each direction into account. Though I agree that 7 is a bit excessive, but better safe than sorry. And my question remains: in the X-direction, where the pitch is on the order of 10um, compared to Y where the pitch is a few hundred microns, can I have an asymmetric weighting field that extends to 7 neighboring pixels in the X-direction and only the adjacent 1 in the Y-direction?
I assume so since no errors are thrown.
4. In connection to 3. Does APSQ treat the points outside where the weighting field extends to as 0?
And regarding your final comments, could it be due to the highly asymmetric pixels(?) ->The scaling is very off since the pixels are ~504um in Y and 14um in X, with the electrodes being 501umx10um. I have imported the fields into Python and checked, and they seem correct there, centered and all. Though I do use an odd number of points, if that could cause problems(?)
Regarding the solving for the weighting potential, I use COMSOL and solve the Laplace equation with a 15 by 15 pixels grid,
- all electrodes are at ground (the pixel electrodes and the backside electrode) except the center one,
- the middle electrode is at unit potential,
- the sides of the volume have a zero flux condition (Should be fine since it is far far away from the electrode of interest, but input is appreciated).
- I then export the potential in a regular grid with the electrode of interest in the center.
Do you have any recommendations regarding the process?
I do basically the same for the electric field, but use the physics models of COMSOL.
I really appreciate the help!
/Rickard