Plasma and conduction resonance dispersion for bulk and aggregated metals

摘要

Interaction between plasmons and electrons in bulk metals may alter the character of the plasmons and may shift their frequency from the free‐electron value h̸ωpf. In aggregated metals, both the plasmons and the optical conduction resonance (OCR) may be similarly affected. In this work, a model system consisting of free electrons and a single Lorentzian oscillator is used to study the plasma and OCR dispersion in terms of the oscillator frequency. The results predict quantitatively the way interband transitions can hybridize plasma and OCR resonance in bulk and aggregated metals, and the way they can shift the resonace frequencies in both directions from their free‐electron value. These predictions are compared with experimental results on some real metals.