Publication

Robustness in Subwavelength Locally-Resonant Metamaterial Waveguides

Abstract

Guiding electromagnetic energy at a subwavelength scale is one of the most highly demanded functionalities in a variety of applications, including compact, lightweight satellite communications, signal and data processing, and power systems. The existing schemes for subwavelength waveguiding, including topological designs, are usually based on the use of locally resonant metamaterials and generally sensitive to the lattice imperfections and disorder-induced backscattering. We quantitatively assess here the robustness of subwavelength edge modes in different waveguide designs, including designs based on C6 symmetry or valley-Hall (VH) topological insulators (TI) and non-topological designs based on chirality or a frequency defect line. The statistical results demonstrate that all waveguiding schemes provide a different level of robustness of the edge modes for different types of disorder and superior robustness of VH and chiral metamaterial waveguides to all three types of disorder.

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Related concepts (29)
Acoustic metamaterial
An acoustic metamaterial, sonic crystal, or phononic crystal is a material designed to control, direct, and manipulate sound waves or phonons in gases, liquids, and solids (crystal lattices). Sound wave control is accomplished through manipulating parameters such as the bulk modulus β, density ρ, and chirality. They can be engineered to either transmit, or trap and amplify sound waves at certain frequencies. In the latter case, the material is an acoustic resonator.
Metamaterial
A metamaterial (from the Greek word μετά meta, meaning "beyond" or "after", and the Latin word materia, meaning "matter" or "material") is any material engineered to have a property that is rarely observed in naturally occurring materials. They are made from assemblies of multiple elements fashioned from composite materials such as metals and plastics. These materials are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence.
Computational electromagnetics
Computational electromagnetics (CEM), computational electrodynamics or electromagnetic modeling is the process of modeling the interaction of electromagnetic fields with physical objects and the environment. It typically involves using computer programs to compute approximate solutions to Maxwell's equations to calculate antenna performance, electromagnetic compatibility, radar cross section and electromagnetic wave propagation when not in free space.
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