Dear Steven and MPB users, I have solved the problem about the surface mode in 2D-PC triangular structure of air holes in dielectric background. You can see my PC structure in the attach.My problem is the surface mode along Gamma-M direction (by changing the surface termination along Gamma-M). In that case, the surface termination factor C=0.5. I want to investigate the surface band structures for various the surface termination factors. I don't know how to define that structure MPB. Please help me. Thank you in advance. Best regards, Chad Huskow
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