A perfect Fresnel acoustic reflector implemented by a Fano-resonant metascreen

M. Amin, O. Siddiqui, Mohamed Farhat, A. Khelif

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We propose a perfectly reflecting acoustic metasurface which is designed by replacing the curved segments of the traditional Fresnel reflector by flat Fano-resonant sub-wavelength unit cells. To preserve the original Fresnel focusing mechanism, the unit cell phase follows a specific phase profile which is obtained by applying the generalized Snell's law and Fermat's principle. The reflected curved phase fronts are thus created at the air-metasurface boundary by tailoring the metasurface dispersion as dictated by Huygens' principle. Since the unit cells are implemented by sub-wavelength double slit-shaped cavity resonators, the impinging sound waves are perfectly reflected producing acoustic focusing with negligible absorption. We use plane-wave solution and full-wave simulations to demonstrate the focusing effects. The simulation results closely follow the analytical predictions.
Original languageEnglish (US)
Pages (from-to)144502
JournalJournal of Applied Physics
Volume123
Issue number14
DOIs
StatePublished - Apr 10 2018

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