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您的检索式：作者名="M.McDermott"
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| 1 | Acoustic Supercoupling in a Zero-Compressibility Waveguide显示文摘Funneling acoustic waves through largely mismatched channels is of fundamental importance to tailor and transmit sound for a variety of applications.In electromagnetics,zero-permittivity metamaterials have been used to enhance the coupling of energy in and out of ultranarrow channels,based on a phenomenon known as supercoupling.Tese metamaterial channels can support total transmission and complete phase uniformity,independent of the channel length,despite being geometrically mismatched with their input and output ports.In the feld of acoustics,this phenomenon is challenging to achieve,since it requires zero-density metamaterials,typically realized with waveguides periodically loaded with membranes or resonators.Compared to electromagnetics,the additional challenge is due to the fact that conventional acoustic waveguides do not support a cut-of for the dominant mode of propagation,and therefore zero-index can be achieved only based on a collective resonance of the loading elements.Here we propose and experimentally realize acoustic supercoupling in a dual regime,using a compressibility-nearzero acoustic channel.Rather than engineering the channel with subwavelength inclusions,we operate at the cut-of of a higherorder acoustic mode,demonstrating the realization and efcient excitation of a zero-compressibility waveguide with efective sof boundaries.We experimentally verify strong transmission through a largely mismatched channel and uniform phase distribution,independent of the channel length.Our results open interesting pathways towards the realization of extreme acoustic parameters and their implementation in relevant applications,such as ultrasound imaging,acoustic transduction and sensing,nondestructive evaluation,and sound communications. | H.Esfahlani M.S.Byrne M.McDermott A.Alù | 2019 | Research2019，，1： | 1 |
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