Surface modes of big clusters and resonances in generalized LC_model of metal-dielectric nanocomposites

[摘要] Random impedance networks with inductive L and capacitive C bonds have been widely addressed in a literature to describe properties of disordered metal-dielectric nanocomposites. In this paper we show that networks with single bonds in the form of parallel oscillatory LC-circuits and capacitances C are more appropriate model for metal-dielectric composite in optical frequency range. Resonant spectrum of such networks demonstrates absence of resonances at frequencies higher than the plasma frequency of metal ωp. Eigenmodes of big ordered clusters are studied. Their resonances are shown to be surface modes having the form of multipoles of various order. It is in agreement with theory of surface plasmons in metallic nanowires. The idea for metal-metal and metal-semiconductor nanocomposites with different plasma frequencies is put forward.

[发布机构] Ioffe Physico-Technical Institute, Saint Petersburg; 194021, Russia^1;Saint Petersburg State Polytechnical University, Saint Petersburg; 195251, Russia^2;Université Montpellier II, CNRS, Montpellier; 34095, France^3

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Appropriate models;Disordered metals;Metal dielectrics;Metal-dielectric composites;Metal-semiconductor nanocomposites;Metallic nanowires;Plasma frequencies;Resonant spectrum