Hi Guilin,
Thank you for your reply. I would like to use the expansion monitors to try the angled monitor. I feel it is a little bit challenging for me. In order to describe my question more visually, I have attached an example.
According to the LumOpt tutorial page (https://lumopt.readthedocs.io/en/latest/tutorial.html), the basic setup for the output waveguide is horizontal.
In this case, I want to set up the output waveguides with a certain angle so that they can split as early as possible. When I have angled output waveguides, the regular frequency & power monitors cannot work as an input source in the adjoint simulation with a minimum simulation time. Therefore, the frequency & power monitor might not work without a rotation for this inverse design.
I have attached the files through a Dropbox link and hope you could check them if possible.
(https://www.dropbox.com/scl/fo/say26373rq5dcm4ilwzvb/h?dl=0&rlkey=d7srn5nctcfvafq6c2l6zth6i)
Thanks again for your time.