Insert cell in a specific face

[Qvadi]

Hi,
Is it possible to add a waveguide coplanar element in a specific face id?

for example,
self.insert_cell(WaveguideCoplanar, face_id = "2b1")

It seems like insert_cell() only inserts elements in the default face_id which is set by the face_ids[0] list. Can you on-demand do this somehow?

[qpavsmi]

Hi,
the face where the geometry of the cell are placed at are controlled by the face_ids parameter. The parameter takes a list of face strings as value, by default set to ["1t1", "2b1", "1b1", "2t1"]. In the element class code we point to the index in that list to place appropriate geometry at appropriate faces. For example a flipchip will point to 0 in face_ids => "1t1" to define geometry of the bottom chip and point to 1 in face_ids => "2b1" to define geometry on the top chip. But if we would like to invert this order, passing a "face_ids": ["2b1", "1t1"] parameter value would do that.

So, to fix your issue, since insert_cell can also take parameters for the element class you are adding, then self.insert_cell(WaveguideCoplanar, {"face_ids": ["2b1", "1t1"]}) should work

[Qvadi]

Thanks! It works. To restate the problem I was trying to solve:
I had two insert_cell instances, one which is built out of waveguide_composite and the other one with meander. For the waveguide_composite, layer changing works well. But when you insert the meander at the position where there waveguide_composite ends, the layer continuity was not maintained inspite of me passing the argument face_id="2b1" like you do when you want to change layers in waveguide_composite definition. This didnt work.

Solution: what worked as suggested by qpavsmi is a slightly modified version insert_cell(Meander, face_ids=["1t1", "2b1"]) along with other parameters for the meander element.