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  • Letter
  • Open Access

Compact and highly efficient plasmonic mode conversion in a metal slab waveguide with asymmetric subwaveguides

Kum-Song Ho, Myong-Song Jong, Jin Kang, Song-Jin Im*, Kum-Dong Kim, Kil-Song Song, Ji-Song Pae, and Chol-Song Ri

  • Department of Physics, Kim Il Sung University, Taesong District, 02-381-4410 Pyongyang, Democratic People's Republic of Korea

  • *Contact author: sj.im@ryongnamsan.edu.kp
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Phys. Rev. B 111, L081406 – Published 25 February, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L081406

Abstract

Compact plasmonic devices have paved a way to achieve highly integrated photonic circuit for the next-generation information technology. In this Letter, we proposed compact and highly efficient plasmonic mode conversion between symmetric and antisymmetric modes in metal slab waveguides containing asymmetric dielectric substructures. We derived intuitive analytical formulations concerning the mode asymmetry and intermode coupling in the asymmetric subwaveguide. And we estimated a conversion efficiency and compactness of the proposed plasmonic mode conversion. As a result, we confirmed the compact and high-efficiency plasmonic mode converter with conversion efficiency as high as 90% and a compact size up to one wavelength. The suggested device will give us potential possibilities to construct on-chip photonic computing networks.

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Phys. Rev. B 111, L081406– Published 25 February, 2025
  • Received 26 November 2024
  • Revised 23 January 2025
  • Accepted 12 February 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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