Broadband mode conversion via gradient index metamaterials

TL;DR

This paper introduces a broadband waveguide mode conversion technique using gradient index metamaterials, enabling efficient mode transformation over a wide frequency range and asymmetric propagation with integrated zero index metamaterials.

Contribution

The paper presents a novel design for broadband mode conversion in waveguides utilizing gradient index metamaterials, demonstrating effective mode transformation over a broad frequency spectrum.

Findings

Successful conversion of TM0/TE1 to TM1/TE2 modes across a broad frequency range

Implementation of asymmetric propagation using integrated zero index metamaterials

Numerical simulations validate the effectiveness of the proposed design

Abstract

We propose a design for broadband waveguide mode conversion based on gradient index metamaterials (GIMs). Numerical simulations demonstrate that the zeroth order of transverse magnetic mode or the first order of transverse electric mode (TM0/TE1) can be converted into the first order of transverse magnetic mode or the second order of transverse electric mode (TM1/TE2) for a broadband of frequencies. As an application, an asymmetric propagation is achieved by integrating zero index metamaterials inside the GIM waveguide.