Abstract
Size-dependent optical properties of large metal clusters are studied on the example of spherical sodium clusters. The model is based on the fact, that a sphere filled with free-electron gas forms a cavity with size dependent eigenfrequencies of the optically excitable TM plasmons. Therefore the dielectric function of the system gains the resonant character. The dielectric function defines the size-dependent indices of absorption and of refraction.
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Kolwas, K. Size dependent index of refraction and absorption of a spherical metal cluster. Z Phys D - Atoms, Molecules and Clusters 38, 233–240 (1996). https://doi.org/10.1007/s004600050087
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DOI: https://doi.org/10.1007/s004600050087