I'm trying to implement a PML for a 1d simulation domain of silver (1d code for testing purpose), which is modeled as a drude model. I've used the PML for dispersive media as introduced in Gedney's paper, where you introduce a P term and insert the sigma from silver as eps_r(w). And for PML, i just used the basic formula from Taflove's book with an order m=4 and my PML is not absorbing properly. I guess there's something wrong with my parameter for PML, i.e. i didn't vary the sigma_max for silver. I tried to search paper on this topic but it seems people don't give much detail on how they implement the pml in their papers. Could anyone give me some idea what i did wrong?
Thank you so much!