What is it about?
Embedded eigenstates (EEs) are non-radiating eigenmodes supported by open structures which provide several applications such as sensing, lasing, filtering, etc. In this work, we explore acoustic embedded scattering eigenstates within the radiation continuum enabled by resonant metasurface pairs consisting of arrays of Helmholtz resonators
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Why is it important?
EEs have useful application in acoustics. For example, acoustic EE can support supersonic surface acoustic waves (SAWs) with high phase velocity which are widely used in mobile phone and Bluetooth devices as SAW filters. Acoustic EEs based on resonant metasurface pairs have not been explored, though this mechanism exhibits several interesting features, such as the possibility to achieve very large Q-factors for radiation modes in free-space. In this work, we explore the design of acoustic EEs based on resonant metasurface pairs with unbounded Q-factor.
Perspectives
We believe the presented structure to generate EE, provides perfect filtering which leads to several useful and interesting applications in acoustics. The paper can also trigger several new designs to achieve acoustic EE both theoretically and experimentally in open structures.
Zahra Hamzavi Zarghani
Read the Original
This page is a summary of: Acoustic embedded eigenstates in metasurface-based structures, Applied Physics Letters, November 2022, American Institute of Physics,
DOI: 10.1063/5.0114885.
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