Electromagnetic Waves, Beam Envelopes, Unidirectional
In this part, we copy the Electromagnetic Waves, Beam Envelopes physics interface to make a bidirectional simulation, where the two wave vectors are codirectional but use the propagation constants of the two beating modes. In this case, each wave will have an almost constant amplitude, so a very coarse mesh can be used in the propagation direction.
1
In the Model Builder window, under Component 1, right-click Electromagnetic Waves, Beam Envelopes and choose Copy .
2
In the Model Builder window, right-click Component 1 and choose Paste Electromagnetic Waves, Beam Envelopes .
3
In the Message from Paste dialog that appears, click the OK button to close the dialog window.
4
In the Settings window for Electromagnetic Waves, Beam Envelopes, Unidirectional 1, change the Label text field to Electromagnetic Waves, Beam Envelopes, Bidirectional.
5
In the Settings window for Electromagnetic Waves, Beam Envelopes, locate the Wave Vectors section.
6
From the Number of directions list, choose Bidirectional.
7
Enter ewbe2.beta_2 in the x text field of the k2 table, as shown in the figure above. As ewbe2.k1y and ewbe2.k1z evaluates to zero, the second wave vector points in the x direction and has a magnitude of ewbe2.beta_2.