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View article: Hybrid membrane resonators for multiple frequency asymmetric absorption and reflection in large waveguide
Hybrid membrane resonators for multiple frequency asymmetric absorption and reflection in large waveguide Open
We report that Hybrid membrane resonators (HMRs) made of a decorated membrane resonator backed by a shallow cavity can function as Helmholtz resonators (HRs) when mounted on the sidewall of a clear waveguide for air ventilation. When two s…
View article: Optimal sound-absorbing structures
Optimal sound-absorbing structures Open
Absorption by design, with minimal sample thickness allowed by the law of nature, can now be realized by using a design recipe that incorporates the causal constraint of acoustic response as a crucial element.
View article: Optimal Sound Absorbing Structures
Optimal Sound Absorbing Structures Open
Causal nature of the acoustic response, for any materials or structures, dictates an inequality that relates the absorption spectrum of the sample to its thickness. We present a general recipe for constructing sound-absorbing structures th…
View article: Subwavelength total acoustic absorption with degenerate resonators
Subwavelength total acoustic absorption with degenerate resonators Open
We report the experimental realization of perfect sound absorption by sub-wavelength monopole and dipole resonators that exhibit degenerate resonant frequencies. This is achieved through the destructive interference of two resonators' tran…
View article: Sound absorption by subwavelength membrane structures: A geometric perspective
Sound absorption by subwavelength membrane structures: A geometric perspective Open
Decorated membranes comprising a thin layer of elastic film with small rigid platelets fixed on top have been found to be efficient absorbers of low-frequency sound. In this work we consider the problem of sound absorption from a perspecti…