I am looking for a good reference (textbook, paper, website, etc.) showing the derivation of the Drude model equations which are used for index perturbation in FDTD. Would anyone be willing to suggest one?
As a side note, I believe the delta_alpha in the “Theory behind the Drude expansion model” section of the site linked above should be proportional to lambda squared, not lambda cubed. Can anyone confirm this? Or if I am wrong, where does the extra factor of lambda come from? As a reference see equation (5) in Soref and Bennett’s original paper here:
Edited on 7/3 to fix broken link.