Dear Johnson, Thanks for your last reply. I have a problem on the discretization of structure in FDTD. As you mentioned in the Meep Tutorial, at least 8 pixels/wavelength in the highest dielectric is a good idea. However, when I simulate a waveguide multiple bends structure formed in the photonic-crystal slab, the transmit flux goes to divergence. We set the resolution to 10 as usual, while the high-dielectric material with epsilon of 12, the frequencies lies in the range of 0.25～0.35, which corresponds to around 29～40 pixels/wavelength, or around 9～12 pixels/wavelength in the high-dielectric material. Is the pixels too little for multiple bends structure to get the right consequence?
If it is true, then what is the best value for resolution that can get the balance to both accuracy and efficiency? Thank you very much! Regards Bonny Chan
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