Hi everybody, I have theoretical question about some results that I obtained on metallic waveguides (M-I-M). I used MEEP to make a banddiagram of such a waveguide and the results I get look credible. I see no cut-off for the fundamental TM mode etc. etc...
Now what I'm wondering about, the band of the first order TM mode, crosses the light line at some point... But what does this crossing mean for a metallic waveguide? If you do a similar calculation for, for example, a photonic crystal, modes above the light are extended in the air surrounding the waveguide. But the metallic waveguides are a closed system. So what happens with modes inside the light cone? Thanks and best regards, Milan
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