I am trying to replicate the data from the following article:
Article Direct comparison of the performance of Bloch surface wave a...
In this article they excite plasmon field on a film of gold that is in contact with water. They say, that field distribution of such plasmon looks like on a Fig. 1. (attached to this post, click to expand it).
I want to replicate the result with FDTD method (R-soft), but on a contour map of the H-field (fig. 2, attached to this post), I can see that intense field is only on the "substrate" side of the thin Au film.
So why are those surface fields in my simulation on the wrong side?
Details of my simulation:
grid size 20 times smaller than the thickness of the film (which is 40 nm)
Excitation is just like in the article, 804 nm.
Incidence angle is 68 degrees.
Dear Marcin Zyskowski,
I have referred to the paper that you mention, But I still have some question to identify the problem with your simulation: what is the light source you are using based on the surface? Where is the source located related to the interaction surface between the water and Au film? Have you identified the water material correctly through the simulation? Have you tried back a source propagation? What is the border of the FDTD window in the simulation (are water layer included)?
Best Regards,
Musab TR
Looks like a total internal reflection for me. Check the polarization of the incident wave - if I recoll correctly, for Bloch you would need s-pol and for SPR - p-pol. You should get something like Fig.2 if trying SPR with s-pol.
Hope it helps.
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