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• W4387141108 abstract "Interference with a nonlinear cavity mode undergoing a self-sustained limit cycle can lead to superradiant amplification of incident waves. This effect, which results from nonlinear wave-mode coupling, is theoretically predicted and experimentally confirmed in this work. On the theoretical side, we present a nonlinear coupled-mode framework to derive an analytical expression for the scattering matrix. These predictions are then validated against experiments on a superradiant acoustic meta-atom, which uses deep-cavity whistling to create a limit cycle. The proposed all-acoustic meta-atom requires no active elements to manipulate the sound field, but achieves superradiant amplification by nonreciprocal coupling between the incident wave and the synchronized whistling tone (limit cycle). We demonstrate with this setup that the nonlinear phenomena we present can be exploited to quasipassively tune the scattering matrix of a resonant cavity. As a proof of concept, we convert a lossy, weakly reflective scatterer into a reflection amplifier. We explain how the synchronization-based realization of superradiance reported in this work may be exploited in the future to design lossless, nonacoustic scatterers for metamaterial applications." @default.
• W4387141108 created "2023-09-29" @default.
• W4387141108 creator A5005160866 @default.
• W4387141108 creator A5057539913 @default.
• W4387141108 date "2023-09-28" @default.
• W4387141108 modified "2023-10-18" @default.
• W4387141108 title "Superradiant Scattering by a Limit Cycle" @default.
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• W4387141108 doi "https://doi.org/10.1103/physrevapplied.20.034068" @default.
• W4387141108 hasPublicationYear "2023" @default.
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