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Title: Escalated deep-subwavelength acoustic imaging with field enhancement inside a metalens
Authors: Chen, Jian
Sun, Zeqing
Rao, Jing
Lisevych, Danylo
Fan, Zheng
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Chen, J., Sun, Z., Rao, J., Lisevych, D. & Fan, Z. (2021). Escalated deep-subwavelength acoustic imaging with field enhancement inside a metalens. Physical Review Applied, 16(4), 044021-.
Project: MOE2019-T2-2-068
Journal: Physical Review Applied
Abstract: Super-resolution acoustic imaging with state-of-the-art spatial resolution (lambda/50), with lambda being the wavelength, is showcased with a holey-structured metalens. However, the imaging mechanism under unity transmission based on Fabry-Perot resonances means the metalens fundamentally suffers from narrow bandwidth and limited deep-subwavelength contrast, and therefore further advancement of deepsubwavelength imaging has been stalled. Here we break the barriers for deep-subwavelength acoustic imaging comprehensively in spatial resolution, resolving contrast, and working bandwidth, by exploiting field enhancement inside the metalens. A microscopic model is established to theoretically reveal the underlying physics for escalated deep-subwavelength acoustic imaging. For a proof-of-concept, the imaging performance of the proposed method is numerically proven and experimentally demonstrated. Specifically, a breakthrough resolution below lambda/100 is achieved while resolving contrast is improved by at least 6.5 times and working bandwidth is broadened to approximately 25% of the operating frequency. Furthermore, pulsed acoustic imaging on the deep-subwavelength scale is showcased, which is an important step towards the practical application of the ultrahigh-resolution acoustic imaging technique. We believe the work presented here may greatly benefit a variety of fields in acoustics, such as visualizing subcutaneous structures in medical diagnosis and characterizing subsurface flaws in industrial nondestructive evaluation.
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.16.044021
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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