Plasmon Phenomena in Metal-Dielectric Nanodiscs. An Equivalent-Spheroid Approach
DOI:
https://doi.org/10.15407/ujpe70.4.263Keywords:
metal-dielectric nanodisk, polarizability tensor, extinction efficiency, relaxation rate, surface plasmon resonanceAbstract
In the framework of the equivalent-spheroid approach, the expressions for the diagonal components of the polarizability tensor and the extinction efficiency, as well as the size dependences of the longitudinal and transverse surface plasmon resonance frequencies for metal-dielectric nanodisks, have been obtained. The results of calculations of the indicated characteristics are presented for disks of various sizes. The influence of the core and shell materials and the disk sizes on the position and magnitude of the extinction efficiency maximum has been analyzed. The reason for why only one maximum in the extinction spectra of metal-dielectric nanodisks is detected has been determined.
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