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Input Gaussian Beam (2d Grating coupler)

Posted 17 nov 2011, 11:49 GMT-5 RF & Microwave Engineering Version 4.2 2 Replies

Norman Fong
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Hi Everyone,

I'm trying to produce a 2-D grating coupler simulation similar to that demonstrated here:
www.comsol.com/papers/4980/

I'm stuck at the point where I need to define an input Gaussian beam. I have defined the input port and enabled wave excitation, but regardless of what other values/settings I use, I will always get zero electric field everywhere.

To simplify things I threw away my model and just started with a simple box and set one side as the input port and tried to observe a plane wave propagating and still I don't see anything, so clearly I'm not implementing the input correctly.

Does anyone have any ideas?

Thanks in advance.
2 Replies Last Post 18 gen 2012, 16:36 GMT-5
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Hello Norman Fong

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KH
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Posted: 1 decade ago 3 gen 2012, 08:08 GMT-5
Hi

I'm also interested in this kind of simulations.

I had some ideas to proceed in the 3.5 version, but here the accessible parameters on the 4.2 are quite different.

I tried without success with the "Plasmonic Wire Grating" Model. It seems to be a good start because the angle of incidence is simulated and the S11 parameter give directly the reflection spectra.

I also tried by starting from this model: www.comsol.com/showroom/documentation/model/6141/ without success either.

Let us know if you progressed!

Regards.
Hi I'm also interested in this kind of simulations. I had some ideas to proceed in the 3.5 version, but here the accessible parameters on the 4.2 are quite different. I tried without success with the "Plasmonic Wire Grating" Model. It seems to be a good start because the angle of incidence is simulated and the S11 parameter give directly the reflection spectra. I also tried by starting from this model: http://www.comsol.com/showroom/documentation/model/6141/ without success either. Let us know if you progressed! Regards.
Alexander Kuznetsov
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Posted: 1 decade ago 18 gen 2012, 16:36 GMT-5
here is a good starting point for plane wave: www.comsol.com/showroom/gallery/8610/
here is a good starting point for plane wave: http://www.comsol.com/showroom/gallery/8610/

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