Acoustic Bound States in the Continuum and Exceptional Points in Coupled Helmholtz Resonators
arxiv(2024)
摘要
Resonant states underlie a variety of metastructures that exhibit remarkable
capabilities for effective control of acoustic waves at subwavelength scales.
The development of metamaterials relies on the rigorous mode engineering
providing the implementation of the desired properties. At the same time, the
application of metamaterials is still limited as their building blocks are
frequently characterized by complicated geometry and can't be tuned easily. In
this work, we consider a simple system of coupled Helmholtz resonators and
study their properties associated with the tuning of coupling strength and
symmetry breaking. We numerically and experimentally demonstrate the excitation
of quasi-bound state in the continuum in the resonators placed in a free space
and in a rectangular cavity. It is also shown that tuning the intrinsic losses
via introducing porous inserts can lead to spectral splitting or merging of
quasi-bound states in the continuum and occurrence of exceptional points. The
obtained results will open new opportunities for the development of simple and
easy-tunable metastructures based on Helmholtz resonances.
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