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Soft Metalens for Broadband Ultrasonic Focusing Through Aberration Layers
The authors present a soft metalens (SML) with tungsten-gel composite for ultra-broadband transcranial focus, significantly enhancing intracranial sound pressure and spatial resolution. This breakthrough advances underwater sonar, medical ultrasound imaging, and non-invasive detection for energy transmission.
Without SML, the two-dimensional acoustic transmission intensity profiles exhibit unfocused ultrasound with sound pressure damping in the infratemporal region with a center position located 50 mm from the inner layer of the human skull model (Fig. Without SML, the two-dimensional acoustic transmission intensity profiles exhibit unfocused ultrasound with sound pressure damping across parietal region with a center position located 50 mm from the inner layer of the real human skull (Fig. High-frequency plane piston generator with the dimension of 12 cm and 125 kHz center frequency is customized from China Shipbuilding Heavy Industry Corporation (CSSIC), piezoelectric material particle splicing process with connected positive and negative terminals in parallel has been used.
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