Optical response and spill-out effects of metal nanostructures with arbitrary shape
Posted on 12.10.2021 - 16:44
In this paper, we propose a simple model for incorporating the spill-out effect of metal nanostructure, and this effect is prominent when the metal nanostructure is reducing to a smaller size. Based on Maxwell’s equations, this model divides the smearing out region into a certain number of thinner layers, thereby the spatial variable of dielectric function can be adjusted into an integer number. In principle, with a finite element method, this model can be applied to arbitrarily shaped metal nanostructures with including spill-out effects. As demonstration examples, the optical resonance spectra of sodium and potassium metal spheres are computed with the proposed model, and the red-shifted plasmon peaks are attained and compared with the previous researches to support the model. Last, we successfully applied the proposed method to the lower symmetrical particles relative to the sphere particles, such as a prolate spheroid and a coned particle, achieving a redshift resonance with considering a spill-out layer.
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Zhang, Heng; Huang, Chuanfu (2021): Optical response and spill-out effects of metal nanostructures with arbitrary shape. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.5623261.v2
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