Dear all
I have a question about the content of “Meep Tutorial/Material dispersion”. http://ab-initio.mit.edu/wiki/index.php?title=Meep_Tutorial/Material_dispersion&oldid=3762 There are two dielectric functions listed there, one is a function of w, another is a function of f. As my realization, w=f in Meep, ex: f=1 then w=1. The two functions should be identical. Why is the gamma divided by 2*pi in function of f? If gamma needs this adjustment, omega has the same unit with gamma, why is it not divided by 2*pi? I am confused about unit transformation. If I find a dispersion relation in SI unit as: epsilon(f)= W + (X*Y^2) / (Y^2 - f^2 - i*f*Z) (SI unit) f is the frequency (Hertz) W, X (No unit) Y, Z, (Hertz) I define Meep unit length = a (meter), speed of light c = 3e8 (m/s) The frequency unit is c/a (Hertz). So I define the parameters in Meep code as epsilon W omega (/ Y (/ c a)) gamma (/ Z (/ c a)) sigma X Is the transformation correct? Any help will be appreciated. Thanks a lot! Wen-Yu Chen
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