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Characteristics of metal–uniaxial chiral–metal plasmonic waveguide structure

M. ARIF1, M. UMAIR1, A. GHAFFAR1,* , MAJEED A. S. ALKANHAL2, Y. KHAN2, M. U. SHAHID3

Affiliation

  1. Department of Physics, University of Agriculture, Faisalabad, Pakistan
  2. Department of Electrical Engineering, King Saud University, Riyadh, Saudi Arabia
  3. Department of Information Engineering, Electronics and Telecommunication (DIET) “La Sapienza” University of Rome, Italy

Abstract

This paper investigates the characteristics of surface plasmon polaritons (SPPs) in a planar waveguide with a uniaxial chiral (UAC) core and metal as cladding. By applying boundary conditions at 𝑥 = ±𝑑, we analytically obtain the dispersion relation. Three different cases of UAC are explored as functions of the incident wave frequency. The effects of chirality (𝜅) and core width (w) on the effective mode index are discussed. It is observed that the effective mode index is highly sensitive when both longitudinal and transverse components of permittivity have different signs (i.e., 𝜀𝑡 > 0, 𝜀𝑧 < 0) compared to other cases. Furthermore, core width has a strong effect on the effective mode index for the proposed waveguide depending on the longitudinal and transverse components of permittivity. Field profiles are also presented to confirm the existence of SPPs. The results of the proposed waveguide reveal that the characteristics of SPPs can be tuned by controlling longitudinal and transverse permittivity, the chirality parameter, and core width. The present work may enable the nanophotonic community to fabricate novel waveguides in the THz frequency range.

Keywords

Uniaxial chiral, Metal, Surface plasmon polaritons, Effective mode index, Waveguide.

Citation

M. ARIF, M. UMAIR, A. GHAFFAR, MAJEED A. S. ALKANHAL, Y. KHAN, M. U. SHAHID, Characteristics of metal–uniaxial chiral–metal plasmonic waveguide structure, Optoelectronics and Advanced Materials - Rapid Communications, 18, 7-8, July-August 2024, pp.313-318 (2024).

Submitted at: Feb. 29, 2024

Accepted at: Aug. 1, 2024