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A low-loss subwavelength plasmonic waveguide for surface plasmon polariton transmission in optical circuits

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Abstract

In this work, a novel plasmonic structure is presented for guiding surface plasmon polaritons, which can be used as a fundamental waveguide in various plasmonic devices. The placement of a graphene nanoribbon between two dielectric layers results in a high concentration of plasmonic waves at the graphene-dielectric interface. Excellent light confinement at the center of the waveguide prevents energy leakage to the lateral regions. As a result, a loss of 0.029 dB/µm and a coupling length of 187.9 µm are achieved, which are better compared to results obtained in other waveguides. The figure-of-merit of 1363.4 for a wavelength of 9.4 µm also indicates that the proposed waveguide has a suitable performance in controlling and guiding surface plasmons. Furthermore, the size of 420 nm2 demonstrates that the designed waveguide is suitable for integration in photonic circuits and can be employed in different devices. The low loss, long coupling length, and compact size of the designed waveguide highlight its excellent performance in guiding surface plasmon polaritons.

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All data generated or analyzed during this study are included in this published article.

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Funding

This work was supported by Shahid Chamran University of Ahvaz, grant number SCU.EE1402.672.

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All authors contributed to the study’s conception and design. Simulation, data collection, and analysis were performed by Maleki and Soroosh. The first draft of the manuscript was written by Maleki. All authors commented on previous versions of the manuscript, and read and approved the final manuscript.

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Correspondence to M. Soroosh.

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Maleki, M.J., Soroosh, M. A low-loss subwavelength plasmonic waveguide for surface plasmon polariton transmission in optical circuits. Opt Quant Electron 55, 1266 (2023). https://doi.org/10.1007/s11082-023-05603-0

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  • DOI: https://doi.org/10.1007/s11082-023-05603-0

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