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Acoustic metamaterial for subwavelength edge detection
#MMPMID26304739
Molerón M
; Daraio C
Nat Commun
2015[Aug]; 6
(?): 8037
PMID26304739
show ga
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.
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