Year: 2019
Analysis in Theory and Applications, Vol. 35 (2019), Iss. 1 : pp. 85–116
Abstract
Metallic bowtie-shaped nanostructures are very interesting objects in optics, due to their capability of localizing and enhancing electromagnetic fields in the vicinity of their central neck. In this article, we investigate the electrostatic plasmonic resonances of two-dimensional bowtie-shaped domains by looking at the spectrum of their Poincaré variational operator. In particular, we show that the latter only consists of essential spectrum and fills the whole interval $[0,1]$. This behavior is very different from what occurs in the counterpart situation of a bowtie domain with only close-to-touching wings, a case where the essential spectrum of the Poincaré variational operator is reduced to an interval $\sigma_{ess}$ strictly containing in $[0,1]$. We provide an explanation for this difference by showing that the spectrum of the Poincaré variational operator of bowtie-shaped domains with close-to-touching wings has eigenvalues which densify and eventually fill the remaining parts of $[0,1] \setminus \sigma_{ess} $ as the distance between the two wings tends to zero.
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/ata.OA-0011
Analysis in Theory and Applications, Vol. 35 (2019), Iss. 1 : pp. 85–116
Published online: 2019-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 32
Keywords: Neumann-Poincaré operator corner singularity spectrum resonance.
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