Dear Steven I try to find the Band Structure for a simple air hole triangular slab using FDTD analysis with the aid of Meep c++ interface. I am to get the bands like those illustrated in your book "Modeling the Flow of Light chapter 8 figure 2".Did these bands generate using FDTD Method? I used nearly same parameters in my c++ code with that of used in the Book but put no B.C. on both Z planes and Bloch B.C in X and Y direction and then depict its Band Diagram . The result was a folded version of Slab Band Structure. I read somewhere that by choosing extra sources with appropriate phases one can simply expunge these folded bands. But unfortunately I don't understand it. Could you please help me getting rid of these folded bands? Also there were some line-like extra bands which I think they correspond to the Z confinement.(Is it true?) In order to get rid of these extra bands and make my simulation more realistic I decide to use PML B.C. in both up and down plains. But what I see in the result does not look like the Slab Bands structures. Harminv cannot detect modes in the light cone properly! I can't figure out where I have mistaken. Could you please Kindly help me resolve my problem? I have also attached my C++ code with two pictures correspond to above experiences.
Thanks in advance -- Yours Sincerely Majid
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