Large electromagnetic activity metamaterial composed of five-segment cranks

A new chiral material composed of a two-dimensional lattice of five-segment cranks, with the same handedness is experimentally and numerically studied. The sample, formed by a single layer of such structures, exhibits huge electromagnetic activity and a negative refraction index for linearly polaris...

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Bibliographic Details
Published in:IET microwaves, antennas & propagation antennas & propagation, 2019-07, Vol.13 (9), p.1414-1418
Main Authors: García-Collado, Angel J, Molina-Cuberos, Gregorio J, Margineda, José, Barba, Ismael
Format: Article
Language:English
Subjects:
chiral material
chiral media
chirality
chirality parameter
electromagnetic activity metamaterial
electromagnetic coupling
electromagnetic metamaterials
five‐segment configuration
five‐segment cranks
linearly polarised waves
negative refraction index
refractive index
Research Article
single layer
three‐segment configuration
three‐segment cranks
two‐dimensional lattice
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Summary:A new chiral material composed of a two-dimensional lattice of five-segment cranks, with the same handedness is experimentally and numerically studied. The sample, formed by a single layer of such structures, exhibits huge electromagnetic activity and a negative refraction index for linearly polarised waves. Both the chirality parameter and the bandwidth with the negative refraction index are larger than those observed in chiral media composed of three-segment cranks. The material also shows pronounced electromagnetic activity (larger than 250° per wavelength). This observed behaviour is attributed to the fact that the five-segment configuration enhances the electromagnetic coupling compared with the three-segment configuration.
ISSN:1751-8725
1751-8733
1751-8733
DOI:10.1049/iet-map.2018.5900