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Appl. Sci. 2018, 8(3), 358;

Bloch-Surface-Polariton-Based Hybrid Nanowire Structure for Subwavelength, Low-Loss Waveguiding

School of Electronic Engineering, Tianjin University of Technology and Education, 1310 Dagu South Rd., Tianjin 300222, China
School of Electronic and Information Engineering, Beihang University, 37 Xueyuan Rd, Beijing 100191, China
National Key Laboratory for Electronic Measurement Technology, North University of China, 3 Xueyuan Rd., Shanxi, Taiyuan 030051, China
Collaborative Innovation Center of Geospatial Technology, 129 Luoyu Road, Wuhan 430079, China
Author to whom correspondence should be addressed.
Received: 1 December 2017 / Revised: 17 January 2018 / Accepted: 26 February 2018 / Published: 1 March 2018
(This article belongs to the Special Issue Surface Waves on Planar Photonic Crystals)
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Surface plasmon polaritons (SPPs) have been thoroughly studied in the past decades for not only sensing but also waveguiding applications. Various plasmonic device structures have been explored due to their ability to confine their optical mode to the subwavelength level. However, with the existence of metal, the large ohmic loss limits the propagation distance of the SPP and thus the scalability of such devices. Therefore, different hybrid waveguides have been proposed to overcome this shortcoming. Through fine tuning of the coupling between the SPP and a conventional waveguide mode, a hybrid mode could be excited with decent mode confinement and extended propagation distance. As an effective alternative of SPP, Bloch surface waves have been re-investigated more recently for their unique advantages. As is supported in all-dielectric structures, the optical loss for the Bloch surface wave is much lower, which stands for a much longer propagating distance. Yet, the confinement of the Bloch surface wave due to the reflections and refractions in the multilayer structure is not as tight as that of the SPP. In this work, by integrating a periodic multilayer structure that supports the Bloch surface wave with a metallic nanowire structure, a hybrid Bloch surface wave polariton could be excited. With the proposed hybrid nanowire structure, a hybrid mode is demonstrated with the deep subwavelength mode confinement and a propagation distance of tens of microns. View Full-Text
Keywords: Bloch surface polariton; surface plasmon polariton; waveguide; hybrid mode Bloch surface polariton; surface plasmon polariton; waveguide; hybrid mode

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kong, W.; Wan, Y.; Zhao, W.; Li, S.; Zheng, Z. Bloch-Surface-Polariton-Based Hybrid Nanowire Structure for Subwavelength, Low-Loss Waveguiding. Appl. Sci. 2018, 8, 358.

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