Drude, Lorentz, Johnson and Christy

Dear Fellows,

I have a question which is not related with software but with some functions which we use in software.

I have to model optical antenna (gold on glass substrate). It is very common problem as you know in RF module. And also I have some metal tip above this structure.

Now I have question.


Have you ever use some other dielectric function of gold (or silver , whatever) except interpolation of vaules from Johnson and Christy?

Does any of you know something about these rules, when we use Drude model, when we use Lorentz expansion, when we use just vaules from Johnson and Christy etc.

Furthermore, does any of you compare results between case when glass substrate has constant dielec. function, and case when glass dielectric constant depends on wavelength?


Anyway, I am ecpecially interested in these rules about Drude, Lorentz, and Johnson and Christy.



Thank you every much on every response.