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Surface modes in plasmonic Bragg fibers with negative average permittivity

Deng, H; Chen, Y; Panoiu, NC; Malomed, BA; Ye, F; (2018) Surface modes in plasmonic Bragg fibers with negative average permittivity. Optics Express , 26 (3) pp. 2559-2568. 10.1364/OE.26.002559. Green open access

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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.

Type: Article
Title: Surface modes in plasmonic Bragg fibers with negative average permittivity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.26.002559
Publisher version: http://doi.org/10.1364/OE.26.002559
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Surface plasmons; Surface dynamics; Subwavelength structures, nanostructures; Nanophotonics and photonic crystals
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10043653
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