Analysis of Metal-Dielectric Waveguides with Circular Sectors

TL;DR

This paper analyzes a metallic corrugated cylindrical waveguide filled with dielectric, revealing it supports TE modes with degenerate dispersion and acts as an anisotropic metamaterial component.

Contribution

It introduces a novel analysis of metal-dielectric waveguides with circular sectors, highlighting their unique dispersion and metamaterial potential.

Findings

Supports only TE guided modes in the continuous limit

Dispersion relation becomes highly degenerated

Acts as an anisotropic cylindrical metamaterial

Abstract

The study of metallic corrugated surfaces has recently received strong attention due to their ability to mimic the behaviour of surface plasmons. In this work, this plasmon-like behaviour is employed to design an open cylindrical waveguide. The structure consists on a longitudinally corrugated metallic cylinder with corrugations filled with a dielectric material. The dispersion relation of this waveguide is analyzed in the \`Ocontinuous limit\'O, defined as the limit in which the number of corrugations is infinite, but keeping their periodicity constant. It is found that, in this limit, the waveguide supports only TE guided modes and their dispersion relation becomes highly degenerated. Finally, it is shown that the waveguide behaves as an anisotropic cylindrical rod with extreme electromagnetic parameters, what makes it possible to apply these structures not only as waveguides but also as building blocks for metamaterials.