Plasmons in ultra-thin gold slabs with quantum spill-out: Fourier modal method, perturbative approach, and analytical model

Alireza Taghizadeh, Thomas Garm Pedersen

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)
12 Downloads (Pure)

Abstract

We numerically study the effect of the quantum spill-out (QSO) on the plasmon mode indices of an ultra-thin metallic slab, using the Fourier modal method (FMM). To improve the convergence of the FMM results, a novel nonlinear coordinate transformation is suggested and employed. Furthermore, we present a perturbative approach for incorporating the effects of QSO on the plasmon mode indices, which agrees very well with the full numerical results. The perturbative approach also provides additional physical insight, and is used to derive analytical expressions for the mode indices using a simple model for the dielectric function. The analytical expressions reproduce the results obtained from the numerically-challenging spill-out problem with much less effort and may be used for understanding the effects of QSO on other plasmonic structures.

Original languageEnglish
JournalOptics Express
Volume27
Issue number25
Pages (from-to)36941-36952
Number of pages12
ISSN1094-4087
DOIs
Publication statusPublished - Dec 2019

Bibliographical note

“© Optics Express [2019] Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.”

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