A surface impedance-based three-channel acoustic metasurface retroreflector
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 30, 2018
- Source ID
- 10.1063/1.5025481
Entities
People
- Ana Díaz-Rubio
- Chen Shen
- Junfei Li
- Steven A Cummer
Organizations
- Aalto University
- Duke University
- Office of Naval Research
- Research Council of Finland