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Phase-Optimized Multi-Step Phase Acoustic Metasurfaces for Arbitrary Multifocal Beamforming.

Jianxin Zhao1, Xiongwei Wei1, Chunlong Fei1

  • 1School of Microelectronics, Xidian University, Xi'an 710071, China.

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Summary
This summary is machine-generated.

Researchers developed a novel multifocal beamforming method using a four-step phase metasurface for focused ultrasound applications. This flexible technique enables arbitrary multifocal beams with consistent focusing quality for advanced biomedical and industrial uses.

Keywords:
Fresnel lensacoustic metasurfaceacoustic tweezersmulti-step phasemultifocal beamforming

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Area of Science:

  • Acoustics
  • Metamaterials
  • Biomedical Engineering

Background:

  • Focused ultrasound is crucial for non-destructive evaluation in biomedical and industrial fields.
  • Traditional methods primarily focus on single-point focusing, limiting multifocal beam capabilities.
  • There is a need for advanced techniques to generate multiple, controllable focal points with ultrasound.

Purpose of the Study:

  • To propose and demonstrate an automatic multifocal beamforming method using a four-step phase metasurface.
  • To enhance the efficiency and flexibility of focused ultrasound for multifocal applications.
  • To validate the performance of the proposed method through simulations and experiments.

Main Methods:

  • Implementation of a four-step phase metasurface for acoustic wave manipulation.
  • Design of phase-optimized hybrid lenses to reduce sidelobe amplitude.
  • Experimental validation including triple-focusing beamforming and particle trapping.

Main Results:

  • The four-step phase metasurface improved transmission and focusing efficiency.
  • The number of focal points did not affect the full width at half maximum (FWHM), demonstrating flexibility.
  • Simulations and experiments showed excellent agreement for triple-focusing beamforming.
  • Particle trapping confirmed the triple-focusing beam profile.

Conclusions:

  • The proposed hybrid lens enables flexible three-dimensional (3D) and arbitrary multifocal beamforming.
  • This method offers potential applications in biomedical imaging, acoustic tweezers, and neural modulation.
  • The technique overcomes limitations of single-point focusing in traditional ultrasound methods.