English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Bound states in the continuum (BICs) provide a viable way of achieving high-Qresonances in both photonics and acoustics. In this work, we proposed a generalmethod of constructing Friedrich-Wintgen (FW) BICs and accidental BICs in acoupled acoustic waveguide-resonator system. We demonstrated that FW BICs canbe achieved with arbitrary two degenerate resonances in a closed resonatorregardless of whether they have the same or opposite parity. Moreover, theireigenmode profiles can be arbitrarily engineered by adjusting the position ofattached waveguide. That suggests an effective way of continuous switching thenature of BIC from FW BIC to symmetry-protected BIC or accidental BICs. Also,such BICs are sustained in the coupled waveguide-resonator system with shapessuch as rectangle, ellipse, and rhomboid. These interesting phenomena are wellexplained by the two-level effective non Hermitian Hamiltonian, where twostrongly coupled degenerate modes play a major role in forming such FW BICs.Besides, we found that such an open system also supports accidental BICs ingeometry space instead of momentum space via tuning the position of attachedwaveguide, which are attributed to the quenched coupling between the waveguideand eigenmodes of the closed cavity. Finally, we fabricated a series of 3Dcoupled-resonator-waveguide and experimentally verified the existence of FWBICs and accidental BICs by measuring the transmission spectra. Our resultscomplement the current BIC library in acoustics and provide new routes fordesigning novel acoustic devices, such as in acoustic absorbers, filters andsensors.

A General Framework of Bound States in the Continuum in an Open Acoustic Resonator