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Design and experimental verification of BICs in circular clusters of scatterers

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MWSW04 - Multiple scattering in engineering and applied sciences

Martí-Sabaté, M., Li, J., Djafari-Rouhani, B., Cummer, S. & Torrent, D. Localization of waves in highly symmetric clusters of scatterers is studied in this work. The quality factor of the resonances that appear when the resonators are placed regularly in the perimeter of a circumference increases with the number of resonators. It will be shown that, for flexural waves, the limit when the number of scatterers tends to infinite defines a condition for the design of the so called bound states in the continuum (BICs), and an analytical expression for their design will be given. The analysis is not only valid for flexural waves, but for any kind of classic wave. Therefore, an experimental design has been done in acoustics, reporting the experimental demonstration of an acoustic BIC open resonator based on the coupling of polygonal arranged holes in a two-dimensional waveguide. The proposed design allows for the scan of the acoustic field and the recovery of the shape of the mode and the estimation of the quality factor from the decaying rate of the signal.

This talk is part of the Isaac Newton Institute Seminar Series series.

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