Perfect resonant absorption of guided water waves by Autler-Townes Splitting

by L.-P. Euve, K. Pham, R. Porter, P. Petitjeans, V. Pagneaux and A. Maurel (Submitted March 2023)

The control of guided water wave propagation based on the Autler-Townes Splitting (ATS) resonance concept is demonstrated experimentally, numerically and theoretically. Complete wave absorption is achieved using an asymmetric point-like scatterer made of two closely spaced resonant side channels connected to a guide and designed so that its energy leakage is in perfect balance with the inherent viscous losses in the system. We demonstrate that the nature of the resonators/guide junction completely controls the positions of the wavenumbers at the reflection and transmission zeros on the real axis; the asymmetry of the resonators completely controls their positions on the imaginary axis. Thus, by adjusting these two independent parameters, we obtain a zero reflection and transmission.

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