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how find bandgap diagram in a Photonic Crystal Fiber using 2d-FDTD?

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ghasem_008

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Hi.
I'm familiar with FDTD very well.
I want to simulate a Photonic Crystal Fiber (PCF) using 2D FDTD.
actually,I want to obtain following figure (figure 1).(this is a Band gap diagram).
in FDTD,we gain fields E and H.
How obtain this diagram from E,H fields?
y-axis is normalized frequency (a/λ).
x_axis is vertices of a cell in PCF (see figure 2).
bandgap diagram.pngfigure2.png
 

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