Abstract
We calculate the ac dielectric function of a model Drude metal-insulator composite, using a three-dimensional ([ital d]=3) transfer-matrix algorithm. The real part of the effective conductivity, Re[ital g][sub [ital e]]([omega]), reveals (i) a Drude peak that appears only above the percolation threshold [ital p][sub [ital c]]; and (ii) a broad spectrum of surface-plasmon resonances whose lower edge approaches zero frequency at [ital p][sub [ital c]]. Sufficiently near [ital p][sub [ital c]], the dielectric function is consistent with an expected scaling form previously verified in [ital d]=2. The surface-plasmon spectrum resembles effective-medium predictions except for a weak but persistent peak near 0.4[omega]/[omega][sub [ital p]].
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
