Meta-Lens Particle Image Velocimetry

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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  • Zhou Zhao
  • Shengming Xu
  • Yulun He
  • Takeshi Yamaguchi
  • Hua Ouyang
  • Takuo Tanaka
  • Shengxian Shi
  • Fei Qi


Original languageEnglish
Article number2310134
Journal / PublicationAdvanced Materials
Issue number17
Online published3 Dec 2023
Publication statusPublished - 25 Apr 2024


Fluid flow behavior is visualized through particle image velocimetry (PIV) for understanding and studying experimental fluid dynamics. However, traditional PIV methods require multiple cameras and conventional lens systems for image acquisition to resolve multi-dimensional velocity fields. In turn, it introduces complexity to the entire system. Meta-lenses are advanced flat optical devices composed of artificial nanoantenna arrays. It can manipulate the wavefront of light with the advantages of ultrathin, compact, and no spherical aberration. Meta-lenses offer novel functionalities and promise to replace traditional optical imaging systems. Here, a binocular meta-lens PIV technique is proposed, where a pair of GaN meta-lenses are fabricated on one substrate and integrated with a imaging sensor to form a compact binocular PIV system. The meta-lens weigh only 116 mg, much lighter than commercial lenses. The 3D velocity field can be obtained by the binocular disparity and particle image displacement information of fluid flow. The measurement error of vortex-ring diameter is ≈1.25% experimentally validates via a Reynolds-number (Re) 2000 vortex-ring. This work demonstrates a new development trend for the PIV technique for rejuvenating traditional flow diagnostic tools toward a more compact, easy-to-deploy technique. It enables further miniaturization and low-power systems for portable, field-use, and space-constrained PIV applications. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • binocular stereo vision, depth perception, meta-lens, particle image velocimetry (PIV)

Citation Format(s)

Meta-Lens Particle Image Velocimetry. / Liu, Xiaoyuan; Zhao, Zhou; Xu, Shengming et al.
In: Advanced Materials, Vol. 36, No. 17, 2310134, 25.04.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review