Multi-resonator metamaterials as multi-band metastructures

Introducing multi-resonator microstructure into phononic metamaterials provides more flexibility in bandgap manipulation. In this work, 3D-acoustic metamaterials of the body- and face-centered cubic lattice systems encompassing nodal isotropic multivibrators are investigated. Our main results are: (...

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Bibliographic Details
Published in:Materials & design 2021-04, Vol.202, p.109522, Article 109522
Main Authors: Gorshkov, Vyacheslav, Sareh, Pooya, Navadeh, Navid, Tereshchuk, Vladimir, Fallah, Arash S.
Format: Article
Language:English
Subjects:
Acoustic mode
Bandgap
Dispersion surface
Multi-resonator
Optic mode
Phononic metamaterial
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Summary:Introducing multi-resonator microstructure into phononic metamaterials provides more flexibility in bandgap manipulation. In this work, 3D-acoustic metamaterials of the body- and face-centered cubic lattice systems encompassing nodal isotropic multivibrators are investigated. Our main results are: (1) the number of bandgaps equals the number, n, of internal masses as each bandgap is a result of the classical analog of the quantum level-repulsion mechanism between internal and external oscillations, and (2) the upper boundary frequencies, ωupper2i, i = 1, 2, ⋯, n, of the gaps formed coincide with eigen-frequencies, ωint;i2 ≠ 0, of the isolated multivibrator, ωupper2;i = ωint; i2, and the lower boundary frequencies, ωlower2,i2, are in good agreement with estimations as ωlower,i2≈ω^int;i2 (ωlower,i2
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2021.109522