Reply To: (Lumerical) Using expand function to obtain component of modes

[Guilin Sun]

expand('monitor1','monitor_ref',x,y,z); 

It decomposes the monitor_1 data into the base mode from monitor_ref. You may need to refer to this  Using Mode Expansion Monitors

to get inofrmaiton for the result of a,b,n,p.

So it is not the simple coefficients c and d as you expected.