An inversely designed acoustic metalens for broadband achromatic ultrasound focusing in solids with coupled soft tissues

Ming Ma; He Gao; Zhongqing Su

doi:10.1117/12.3010310

10 May 2024 An inversely designed acoustic metalens for broadband achromatic ultrasound focusing in solids with coupled soft tissues

Ming Ma, He Gao, Zhongqing Su

Author Affiliations +

Proceedings Volume 12951, Health Monitoring of Structural and Biological Systems XVIII; 129510S (2024) https://doi.org/10.1117/12.3010310
Event: SPIE Smart Structures + Nondestructive Evaluation, 2024, Long Beach, California, United States

Abstract

Precise ultrasound focusing is often limited by the fixed focal points and narrow frequency ranges. In this study, we design and experimentally testify an acoustic meta-lens to facilitate ultrasound focusing in tissues, for potential applications in clinical ultrasound therapy. The proposed meta-lens is capable of focusing broadband ultrasound waves in the megahertz range, by adequately considering acoustic-structure interaction. The manipulation and focusing of ultrasound waves are achieved by inversely optimizing the unit cell parameters of the meta-lens using a genetic algorithm (GA). Both numerical simulation and experiment demonstrate that the inversely designed and GA-optimized meta-lens improves the focusing precision and acoustic energy delivery. In particular, the tunable focal point of the meta-lens enables the scanning of tissue sections without a need to move the meta-lens along soft tissues.

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Ming Ma, He Gao, and Zhongqing Su "An inversely designed acoustic metalens for broadband achromatic ultrasound focusing in solids with coupled soft tissues", Proc. SPIE 12951, Health Monitoring of Structural and Biological Systems XVIII, 129510S (10 May 2024); https://doi.org/10.1117/12.3010310

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KEYWORDS

Tissues

Ultrasonography

Acoustics

Solids

Acoustic waves

Design and modelling

Medical device development

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