Suppression of crosstalk in coupled plasmonic waveguides

TL;DR

This paper presents a method to significantly reduce crosstalk in nanoscale dielectric waveguides by introducing an auxiliary waveguide, with results confirmed through analytical and numerical methods.

Contribution

It introduces a novel approach to suppress crosstalk in coupled plasmonic waveguides using an auxiliary waveguide to match mode wavenumbers.

Findings

Crosstalk is effectively suppressed by mode wavenumber matching.

The system's cross-sectional size is less than two microns, vastly smaller than fiber-based systems.

Analytical results are validated by numerical simulations.

Abstract

We demonstrate the suppression of crosstalk between two dielectric nanowaveguides by placing an auxiliary linear waveguide between loaded waveguides spaced by one wavelength. The total cross-sectional dimension of the system containing two transmission lines is less than two microns that is hundred times smaller than a cross-section of a system made of dielectric fiber. The propagating modes in these waveguides are the sum and the difference of symmetric and antisymmetric modes of the coupled system. Crosstalk is suppressed by matching the wavenumbers of these modes. The analytically obtained results are confirmed by numerical simulation.