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Launch a Gaussian beam on a interior surface of a 3D model

Posted 6 oct. 2015, 15:42 UTC−4 RF & Microwave Engineering Version 4.4 1 Reply

Xinyuan Chong
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Hi all,

I'm trying to simulate a Gaussian beam shining on a finite size nanostructure, which is surrounded by PML. The Gaussian beam is launched on a interior surface and propagate along -z direction.

I have tried the settings in 2D model first and it works fine. But when I move to 3D and set all the domain to be air. I expect to see a Gaussian distribution. However, it did not give me the correct answer.

Can anyone provide me some suggestions?

Thanks in advance,
Xinyuan

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1 Reply Last Post 9 oct. 2015, 08:36 UTC−4
Shakeeb Bin Hasan
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Posted: 9 years ago 9 oct. 2015, 08:36 UTC−4
Unfortunately, I do not have time to take a detailed look at your model. But presuming that you did it all right with ports and the PMLs, I can tell you for a fact that gaussian beams are not the exact solutions of Maxwell equations in 3D geometries. However, in 2D they are. Therefore, I do not find it problematic that you got it fine in 2D but failed with one dimension extra. To me it just means that you are doing the physics right.
Unfortunately, I do not have time to take a detailed look at your model. But presuming that you did it all right with ports and the PMLs, I can tell you for a fact that gaussian beams are not the exact solutions of Maxwell equations in 3D geometries. However, in 2D they are. Therefore, I do not find it problematic that you got it fine in 2D but failed with one dimension extra. To me it just means that you are doing the physics right.

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