Hi, meep users
I want to use meep to simulate nanostructure in gold film. I found the defined
dispersive material parameters by some users pasted in the mail archives are
different from that in the example material-dispersion.ctl. The parameters
defined by meep user contain "delta-epsilon". However, it is "sigma" in
material-dispersion.ctl. Does this difference come from the version difference.
what's the form of epsilon for dispersion material in old version and current
version, respectively. Furthermore, who can tell me how to determine the
parameters, omega, gamma,and sigma for gold in meep version 1.0.3 ? I have a
file of the (n,k) values at different wavelengths for gold. In order to get the
values of omega, gamma, and sigma, I tried to use origin software to fit the
real part and imaginary part values of epsilon obtained from (n, k) file by a
defined formula like y=A+(B1*C1^2)/(C1^2-x^2-i*x*D1)+(B2*C2^2)/(C2^2-x^2-i*x*D2)
according to the formula written in http://ab-initio.mit.edu/wiki/index.php/
Dielectric_materials_in_Meep. But, I have to separate the real part and
imaginary part out of y=A+(B1*C1^2)/(C1^2-x^2-i*x*D1)+(B2*C2^2)/(C2^2-x^2-i*x*
D2) to fit the real part values and imaginary part values of epsilon,
respectively. Thus, I get two different sets of A,B1,C1,D1,B2,C2,D2 for real
part and imaginary part. who can tell me how to fit the real part and imaginary
part at the same time to get a set of A,B1,C1,D1,B2,C2,D2, namely, (epsilon ),
(omega ), (gamma ),(sigma ) ? or the better method to get the values of (
epsilon ), (omega ), (gamma ),(sigma ) for gold? or directly tell me the
typical values of (epsilon ), (omega ), (gamma ),(sigma ) for gold used in
meep version 1.0.3 ?
thank you in advance!
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