Structured channel metamaterials for deep sub wavelength resolution in guided ultrasonics
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Date
2020-06-19
Journal Title
Journal ISSN
Volume Title
Publisher
AIP Publishing
Abstract
Experimental results on deep subwavelength resolution of defects are presented for the first time in the context of guided ultrasonic wave
inspection of defects, using novel “structured channel” metamaterials. An Aluminum bar with side-drilled holes is used as a test sam
ple, interrogated by the fundamental bar-guided symmetric mode. Simulations were conducted to optimize dimensional parameters of the
metamaterial structure. Experiments using metamaterials fabricated accordingly demonstrate a resolution down to 1/72 of the operating
wavelength, potentially bringing the resolution of guided wave inspection to the same range as that of bulk ultrasonics. This work has much
promise for remote inspection in industry and biomedicine.