Ask for help for generating finite width plane wave

[windboylhf]

Hi, recently,I am trying to use FDTD to simulated surface plasmon, after seting total field/scattered field for TE (Ex,Ey,Hz)model,I don't know how to introduce a finite width plane wave in the total field region. After the ordinary procedure to generate a plane wave at the vitural interface, the plane wave will full fill the total field region. Can anybody give me a idea of how to generate a finite width plane wave in the total region? thanks very much!

 

[Azulykit]

Just a thought: If I wanted to simulate a particular field but the software tool did not appear to support the distribution I would ask myself what type of structure would create the desired field?

I would then (try to) include that particular structure in the model. This may be a way to create the field you want for your evaluation.

If the front door is locked, sometimes you can get in the back way.

Good Luck.

 

[windboylhf]

That sounds like a really good idea,Thank you very much for your reply! I will try it.

Best wishes!

 

[zimingmeng]

Does it really exists a finite width plane wave?
To be a approximately plane wave the width of the incident wave must be comparable to the width of the simulation area. That means the incident wave will full fill the simulation area.

 

[wandering heart]

Of course there can't be a true plane wave with finite width.

Why not use infinitely wide plane wave?

 

[MusicMan]

what i understad is that when you use the tf/sf formulation you are propagating a plane wave over the whole tf region... but i agree with the of Azulykit... you may want to model a structrure that would block some of the waves... but of course that should be wide enough not to encounter diffraction or some other phenomena...(just my thought)

 

[tmalc]

apply a window function such as Gaussian profile to the source plane.