Hello community: I have a problem with the capture of the reflection value from a MMI component. I know that the logic for capture the spectrum of the reflection of any component, first we simulate a simple straight waveguide with the dimensions of the input of the component and capture the transmission and reflection for this case. After that, we put the geomtry of our device and again we capture the reflection and transmission component, before we load the negative values of the reflection monitor.
FIrst step, straight waveguide: refl_fr = mp.FluxRegion(center=mp.Vector3(-0.5*cell_x+1*dpml+0.5,0,0), size=mp.Vector3(0,3*taper_in_width,0)) refl = sim.add_flux(fcen, df, nfreq, refl_fr) straight_refl_data = sim.get_flux_data(refl) Second step, with the geometry: sim.load_minus_flux_data(refl, straight_refl_data) mmi_refl_flux = mp.get_fluxes(refl) And this value has to be negative (we have to use minus sign to plot the reflection, for example). My problem is that the final value is positive, so the reflection monitor capture part of the tranmission flux and no the reflection. So, what could be the problem??? Thank very much for the discussion and support. Jorge Fernandez Phd Student UNICAMP
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