Academic Journal of Engineering and Technology Science, 2026, 9(2); doi: 10.25236/AJETS.2026.090209.
Lu Tang1, Weiyi Meng2
1School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
2School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
Acoustic metasurfaces are a class of artificial structures capable of precisely modulating sound wave propagation at subwavelength scales, offering significant potential in sound field manipulation and wavefront reconstruction. To address the limitations of traditional ultrasonic focusing methods, such as structural complexity, bulkiness, and insufficient modulation flexibility, this paper proposes an ultrasonic focusing modulation method based on a resonant-cavity acoustic metasurface. By constructing a subwavelength resonant unit model combined with finite element numerical simulations, the relationship between unit structural parameters and the amplitude-phase response of transmitted sound waves is systematically analyzed, achieving continuous phase modulation within the 0–2π range. On this basis, a discrete phase unit library is established, and a planar metasurface structure consisting of 18 units is designed to realize wavefront reconstruction and spatial focusing of 23 kHz incident ultrasound. Furthermore, the sound field distribution and focusing characteristics are analyzed through numerical simulations. The results indicate that the designed metasurface can produce significant sound pressure enhancement in the target area. Experimentally, an ultrasonic testing platform was constructed to scan and measure the sound field distribution. The experimental results show good agreement with the simulation results regarding focal position and sound pressure distribution characteristics. This study demonstrates that the proposed method enables efficient modulation of ultrasonic waves and holds practical value for acoustic computational modeling and the design of miniaturized acoustic devices. Compared with existing studies, the proposed structure achieves efficient focusing of low-frequency airborne sound waves while maintaining a compact size and structural simplicity, and its feasibility is further validated through experiments.
Acoustic metasurface, Ultrasonic focusing; Phase modulation, Acoustic field measurement, Experimental Validation
Lu Tang, Weiyi Meng. Design and Experimental Validation of a Resonant-Cavity Acoustic Metasurface for 23 kHz Ultrasonic Focusing. Academic Journal of Engineering and Technology Science (2026), Vol. 9, Issue 2: 68-73. https://doi.org/10.25236/AJETS.2026.090209.
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