3D Acoustic Imaging Hitting the Diffraction Limit via Fully Parameter-Optimized Meta-Lens and Frequency-Domain Reconstruction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40736141.
- Also identified by DOI 10.1002/adma.202508453 and PMC identifier 12592918.
- Licence recorded as CC BY-NC.
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Abstract
Super-resolution imaging is the long-sought goal pursued in acoustics. In the past decade, many solutions have been proposed by utilizing various metamaterial devices. For example, in acoustics, the holographic meta-lens is employed to improve the lateral resolutions of ultrasonic imaging. However, the filtering effect of meta-lens broadens the acoustic wave pulses, which severely degrades longitudinal resolutions, making the high-resolution 3D imaging hitherto quite challenging. Here, an innovative solution is proposed by designing and implementing a fully parameter-optimized meta-lens. At the fundamental frequency, this meta-lens can achieve a lateral resolution of 80 µm (≈0.37λ<sub>0</sub>), successfully breaking the diffraction limit. Through the frequency-domain reconstruction, the longitudinal resolution is increased to 296 µm (≈1.36λ<sub>0</sub>). Utilizing the nonlinear effect of ultrasound in water, the acoustic meta-lens can furtherly optimize its imaging quality at the harmonic frequency, where the lateral resolution is increased to 44 µm (≈0.2λ<sub>0</sub>) with the longitudinal resolution to 148 µm (≈0.68λ<sub>0</sub>). The work breaks the bias on meta-lenses with deteriorated longitudinal resolution for broad applications in functional ultrasonic imaging.