Thanks for your answer.nYes, according to your answer, I have put the substrate in the figure. Now I have specified the distance in the figures. Please determine that they are drawn correctly?.Besides, I have two questions. n1- If the wavelength range,(1530 nm - 1560 nm), is considered instead of a wavelength, should be the distance from the boundary condition to the waveguide at least half the wavelength greater? nFor example in wavelength range (1530 - 1560), distance <= 1560/2.nn2- Also, in the figure related to the cross-section in the coordinates (y-z), if the upper boundary condition is the metal type, what should be the distance boundary condition metal to the waveguide? Is it possible to consider the PML boundary condition for metal? n
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