Journal
FRONTIERS IN PHYSICS
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2022.844049
Keywords
metamaterials; metallic meshes; isofrequency contours; quasistatic limit; equivalent circuit
Categories
Funding
- National Key R&D Program of China [2019YFA0308200]
- National Natural Science Foundation of China [62035016, 11874435, 11904421]
- Natural Science Foundation of Guangdong Province [2018B030308005]
- Guangzhou Science, Technology, and Innovation Commission [201904010223]
- Fundamental Research Funds for the Central Universities [20lgjc05, 2021qntd27]
- National Science Foundation of China [11874432]
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In this study, a scheme to engineer the shapes of isofrequency surfaces in metamaterials is proposed based on connection-type wire metamaterials. An equivalent circuit model is developed to analyze the low-frequency dispersion, which demonstrates the ability to achieve different shapes of isofrequency contours by adjusting equivalent circuit parameters.
The topology of isofrequency surface governs the electromagnetic wave propagation and light-matter interaction in metamaterials. For most metamaterials with local medium description, the low-frequency isosurfaces are typical spheres or ellipsoids centered at zero momentum, which, to some extent, limits our manipulation ability on low-frequency wave. In this work, based on connection-type wire metamaterials, we propose a scheme to engineer the shapes of isofrequency surfaces. An equivalent circuit model is developed to analyze the low-frequency dispersion of connection-type metamaterials. It implies that the shape of index ellipsoids at quasistatic limit is determined by the equivalent inductances and capacitances of the metallic meshes. By adjusting these equivalent circuit parameters, we can achieve the isotropic or anisotropic index ellipsoids at quasistatic limit and, hence, a cruciform or bowtie-shaped isofrequency contours for the lowest-frequency band. Our results demonstrate a feasible platform for topological engineering of isofrequency surfaces, which may pave the way to novel devices for manipulating long-wavelength electromagnetic wave.
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