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Graphene-based long-range SPP hybrid waveguide with ultra-long propagation length in mid-infrared range



Graphene-based long-range SPP hybrid waveguide with ultra-long propagation length in mid-infrared range



Optics Express 24(5): 5376-5386



A graphene-based long-range surface plasmon polariton (LRSPP) hybrid waveguide, which is composed of two identical outer graphene nanoribbons and two identical inner silica layers symmetrically placed on both sides of a silicon layer, is investigated using the finite-difference time-domain method. By combining the simulated results with the coupled mode perturbation theory, we demonstrate that the LRSPP and short-range SPP (SRSPP) modes originate from the coupling of the same modes of the two graphene nanoribbons. For the LRSPP mode, an ultra-long propagation length (~10 μm) and an ultra-small mode area (~10-7A0, where A0 is the diffraction-limited mode area) can be simultaneously achieved. This waveguide can be used for future photonic integrated circuits functional in the mid-infrared range.

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Accession: 059779881

Download citation: RISBibTeXText

PMID: 29092361

DOI: 10.1364/OE.24.005376


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