Flow-induced resonance shift in sonic slit array metamaterials

Johan Christensen, Morten Willatzen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A modal analysis of flow-acoustic wave propagation through slit array metamaterials is presented. It is demonstrated that the transmission-coefficient change versus flow speed is a sensitive function of frequency. Our results further confirm that transmission resonance positions and resonance widths change significantly with the flow speed. As a reverse application, the present metamaterial slit structures allow for flow tuning of slit cavity modes, design of surface bound states such as superlens applications where a broad frequency operation interval is sought. Finally, it is shown rather surprisingly that the flow-acoustic coupling is almost independent of the angle of incidence.
Original languageEnglish
Article number 094304
JournalPhysical Review B Condensed Matter
Volume85
Issue number9
Number of pages6
ISSN0163-1829
DOIs
Publication statusPublished - 2012
Externally publishedYes

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