Getting an error while solving modes of a waveguide

[rajat-bob]

I am trying to solve for the modes of a channel waveguide, but I am encountering an error that I don't understand. Please find the code below.

position and size of source plane

src_plane = td.Box(center=[0, 0, sou_pos], size=[sz_plane, sz_plane, 0])

number of modes to compute

num_modes = 2

setup and solve for modes

mode_spec = td.ModeSpec(num_modes=num_modes)
ms = ModeSolver(simulation=sim, plane=src_plane, mode_spec=mode_spec, freqs=[f])
modes = ms.solve()

print("Effective index of computed modes: ", np.array(modes.n_eff))

the error I am getting is,

NameError Traceback (most recent call last)
Cell In[62], line 9
7 # setup and solve for modes
8 mode_spec = td.ModeSpec(num_modes=num_modes)
----> 9 ms = ModeSolver(simulation=sim, plane=src_plane, mode_spec=mode_spec, freqs=[f])
10 modes = ms.solve()
12 print("Effective index of computed modes: ", np.array(modes.n_eff))

NameError: name 'ModeSolver' is not defined

[momchil-flex]

It sounds like you just haven't imported the mode solver?

from tidy3d.plugins.mode import ModeSolver