A surface impedance-based three-channel acoustic metasurface retroreflector

Chen Shen, Ana Díaz-Rubio, Junfei Li, Steven A. Cummer

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


We propose the design and measurement of an acoustic metasurface retroreflector that works at three discrete incident angles. An impedance model is developed such that for acoustic waves impinging at -60°, the reflected wave is defined by the surface impedance of the metasurface, which is realized by a periodic grating. At 0° and 60°, the retroreflection condition can be fulfilled by the diffraction of the surface. The thickness of the metasurface is about half of the operating wavelength and the retroreflector functions without parasitic diffraction associated with conventional gradient-index metasurfaces. Such highly efficient and compact retroreflectors open up possibilities in metamaterial-based acoustic sensing and communications.

Original languageEnglish (US)
Article number183503
JournalApplied Physics Letters
Issue number18
StatePublished - Apr 30 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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