caa a22 4500 528786393 20190713030957.0 cr unu---uuuuu 180924s2015 xx s 000 0 eng 10.3929/ethz-b-000103395 doi 10.1038/ncomms9037 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/103395 Molerón Miguel Acoustic metamaterial for subwavelength edge detection [Elektronische Daten] [Miguel Molerón, Chiara Daraio] Nat Commun Open access ethresearch Metamaterials have demonstrated the possibility to produce super-resolved images by restoring propagative and evanescent waves. However, for efficient information transfer, for example, in compressed sensing, it is often desirable to visualize only the fast spatial variations of the wave field (carried by evanescent waves), as the one created by edges or small details. Image processing edge detection algorithms perform such operation, but they add time and complexity to the imaging process. Here we present an acoustic metamaterial that transmits only components of the acoustic field that are approximately equal to or smaller than the operating wavelength. The metamaterial converts evanescent waves into propagative waves exciting trapped resonances, and it uses periodicity to attenuate the propagative components. This approach achieves resolutions ∼5 times smaller than the operating wavelength and makes it possible to visualize independently edges aligned along different directions. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Daraio Chiara joint author Nature Communications London : Nature Publishing Group 6, p. 8037 2041-1723 http://hdl.handle.net/20.500.11850/103395 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/103395 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 100 1- Molerón Miguel ETHRESEARCH 700 1- Daraio Chiara joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 6, p. 8037 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access