Far-field super-resolution focusing with weak side lobes and defect detection via an ultrasonic meta-lens of sharp-edge apertures

Breaking the diffraction limit to achieve super-resolution focusing is a long-sought goal in the field of acoustic imaging and detection. Here, we demonstrated super-resolution focusing of high-frequency ultrasound (5 MHz) based on an acoustic meta-lens with four centrosymmetric dart-like sharp-edge...

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Bibliographic Details
Published in:Applied physics letters 2022-05, Vol.120 (20)
Main Authors: Zeng, Long-Sheng, Li, Zhi-Min, Lin, Zi-Bin, Wu, Hao, Peng, Yu-Gui, Zhu, Xue-Feng
Format: Article
Language:English
Subjects:
Acoustic imaging
Apertures
Applied physics
Diffraction
Lenses
Microscopes
Nondestructive testing
Sidelobes
Ultrasonic imaging
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Summary:Breaking the diffraction limit to achieve super-resolution focusing is a long-sought goal in the field of acoustic imaging and detection. Here, we demonstrated super-resolution focusing of high-frequency ultrasound (5 MHz) based on an acoustic meta-lens with four centrosymmetric dart-like sharp-edge apertures. For the diffracted ultrasound carrying high spatial frequencies, super-resolution focusing is generated in the far field with mainlobe size breaking the diffraction limit (
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0094606