Surface modes in plasmonic Bragg fibers with negative average permittivity

Hanying Deng, Yihang Chen, Nicolae C. Panoiu, Boris A. Malomed, Fangwei Ye

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: We investigate surface modes in plasmonic Bragg fibers composed of nanostructured coaxial cylindrical metal-dielectric multilayers. We demonstrate that the existence of surface modes is determined by the sign of the spatially averaged permittivity of the plasmonic Bragg fiber, ε. Specifically, localized surface modes occur at the interface between the cylindrical core with ε < 0 and the outermost uniform dielectric medium, which is similar to the topologically protected plasmonic surface modes at the interface between two di erent one-dimensional planar metal-dielectric lattices with opposite signs of the averaged permittivity. Moreover, when increasing the number of dielectric-metal rings, the propagation constant of surface modes with di erent azimuthal mode numbers is approaching that of surface plasmon polaritons formed at the corresponding planar metal/dielectric interface. Robustness of such surface modes of plasmonic Bragg fibers is demonstrated as well.

Original languageEnglish
Pages (from-to)2559-2568
Number of pages10
JournalOptics Express
Volume26
Issue number3
DOIs
StatePublished - 5 Feb 2018

Funding

FundersFunder number
Horizon 2020 Framework Programme648328
European Research Council
National Natural Science Foundation of China61475101
Natural Science Foundation of Guangdong Province2017A030313035, 2015A030311018

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