期刊
COMPTES RENDUS PHYSIQUE
卷 21, 期 7-8, 页码 713-749出版社
ACAD SCIENCES
DOI: 10.5802/crphys.32
关键词
Acoustic metamaterials; Perfect absorption; Helmholtz resonators; Locally resonant materials; Critical coupling; Complex frequency plane
资金
- ANR-RGC METARoom project [ANR-18-CE08-0021]
- project HYPERMETA under the program Etoiles Montantes of the Region Pays de la Loire
- Spanish Ministry of Science, Innovation and Universities (MICINN) [IJC2018-037897I]
- COST (European Cooperation in Science and Technology) [DENORMS CA15125]
In this review, we present the results on sub-wavelength perfect acoustic absorption using acoustic metamaterials made of Helmholtz resonators with different setups. Low frequency perfect absorption requires to increase the number of states at low frequencies and finding the good conditions for impedance matching with the background medium. If, in addition, one wishes to reduce the geometric dimensions of the proposed structures for practical issues, one can use properly designed local resonators and achieve sub-wavelength perfect absorption. Helmholtz resonators have been shown good candidates due to their easy tunability of the geometry, so of the resonance frequency, the energy leakage and the intrinsic losses. When plugged to a waveguide or a surrounding medium they behave as open, lossy and resonant systems characterized by their energy leakage and intrinsic losses. The balance between these two represents the critical coupling condition and gives rise to maximum energy absorption. The critical coupling mechanism is represented here in the complex frequency plane in order to interpret the impedance matching condition. In this review we discuss in detail the possibility to obtain perfect absorption by these critical coupling conditions in different systems such as reflection (one-port), transmission (two-ports) or three-ports systems.
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