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Continuously tunable ultrasonic focusing by Moiré metalenses.

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Title: Continuously tunable ultrasonic focusing by Moiré metalenses.
Authors: Yuan, Guo-Qiang1 (AUTHOR), Li, Xin-Rui1,2 (AUTHOR), Zhu, Xing-Feng1,3 (AUTHOR) zhuxingfeng@njnu.edu.cn, Yao, Jie1,3 (AUTHOR), Wei, Qi1,3 (AUTHOR), Wu, Da-Jian1 (AUTHOR) wudajian@njnu.edu.cn
Source: Ultrasonics. Jan2025, Vol. 145, pN.PAG-N.PAG. 1p.
Subjects: Ultrasonic imaging, Focal length, Ultrasonics, Angles, Engineering
Abstract: • Acoustic Moiré metalenses are proposed to achieve continuously tunable ultrasonic focusing by rotating the metasurface. • Metalenses have advantages of a compact configuration, unchanged aperture size, and continuous tunability in a wide range. • Focal length can be adjusted from ∼ 14.3 λ 0 to ∼ 50 λ 0 , and deflection angle of focus can be tuned between - 40 ° , 40 ° . Tunable ultrasonic focusing holds great significance in both medicine and engineering. Recent advancements in metalenses have introduced approaches for tunable acoustic focusing, but their complex configurations and limited tuning range remain challenges. Here, acoustic Moiré metalenses (AMMs) are proposed to achieve continuously tunable ultrasonic focusing in water. Two cascading metasurfaces that can function as Moiré diffractive elements make up the AMM. By mutually rotating the metasurface, the focal point of the AMM can be continuously tuned in a large range. The focal length can be adjusted continuously from ∼ 14.3 λ 0 to ∼ 50 λ 0 for the axial focusing. We further show that the well-designed AMM can achieve the continuously tunable lateral focusing, with the deflection angle of the focal point being tunable between approximately - 40 ° , 40 ° . Both simulation and experimental results confirm the excellent tunable focusing performances of the AMMs. The proposed AMMs with continuously tunable focusing capability may have potential applications in ultrasonic imaging and ultrasound treatment. [ABSTRACT FROM AUTHOR]
Copyright of Ultrasonics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 180730151
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Continuously tunable ultrasonic focusing by Moiré metalenses.
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  Data: <searchLink fieldCode="AR" term="%22Yuan%2C+Guo-Qiang%22">Yuan, Guo-Qiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xin-Rui%22">Li, Xin-Rui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhu%2C+Xing-Feng%22">Zhu, Xing-Feng</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> zhuxingfeng@njnu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yao%2C+Jie%22">Yao, Jie</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wei%2C+Qi%22">Wei, Qi</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Da-Jian%22">Wu, Da-Jian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wudajian@njnu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Ultrasonics%22">Ultrasonics</searchLink>. Jan2025, Vol. 145, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Ultrasonic+imaging%22">Ultrasonic imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Focal+length%22">Focal length</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonics%22">Ultrasonics</searchLink><br /><searchLink fieldCode="DE" term="%22Angles%22">Angles</searchLink><br /><searchLink fieldCode="DE" term="%22Engineering%22">Engineering</searchLink>
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  Label: Abstract
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  Data: • Acoustic Moiré metalenses are proposed to achieve continuously tunable ultrasonic focusing by rotating the metasurface. • Metalenses have advantages of a compact configuration, unchanged aperture size, and continuous tunability in a wide range. • Focal length can be adjusted from ∼ 14.3 λ 0 to ∼ 50 λ 0 , and deflection angle of focus can be tuned between - 40 ° , 40 ° . Tunable ultrasonic focusing holds great significance in both medicine and engineering. Recent advancements in metalenses have introduced approaches for tunable acoustic focusing, but their complex configurations and limited tuning range remain challenges. Here, acoustic Moiré metalenses (AMMs) are proposed to achieve continuously tunable ultrasonic focusing in water. Two cascading metasurfaces that can function as Moiré diffractive elements make up the AMM. By mutually rotating the metasurface, the focal point of the AMM can be continuously tuned in a large range. The focal length can be adjusted continuously from ∼ 14.3 λ 0 to ∼ 50 λ 0 for the axial focusing. We further show that the well-designed AMM can achieve the continuously tunable lateral focusing, with the deflection angle of the focal point being tunable between approximately - 40 ° , 40 ° . Both simulation and experimental results confirm the excellent tunable focusing performances of the AMMs. The proposed AMMs with continuously tunable focusing capability may have potential applications in ultrasonic imaging and ultrasound treatment. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ultrasonics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ultras.2024.107466
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      – Code: eng
        Text: English
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      – SubjectFull: Focal length
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      – TitleFull: Continuously tunable ultrasonic focusing by Moiré metalenses.
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            NameFull: Yuan, Guo-Qiang
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              M: 01
              Text: Jan2025
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