Ultrasound Beam Steering with Flattened Acoustic Metamaterial Luneburg Lens

TL;DR

This paper demonstrates the design, fabrication, and testing of 2D and 3D flattened acoustic metamaterial Luneburg lenses at 40 kHz, achieving effective ultrasound beam steering in near and far fields.

Contribution

It introduces a novel approach using quasi-conformal transformation to design flattened acoustic Luneburg lenses for ultrasound beam steering.

Findings

Excellent beam steering performance demonstrated in experiments.

Numerical and experimental results are in strong agreement.

Lenses operate effectively in both near and far fields.

Abstract

We report ultrasound beam steering based on 2D and 3D flattened acoustic metamaterial Luneburg lenses at 40 kHz. The effective properties of the lenses are obtained by using the quasi-conformal transformation (QCT) technique and solving the Laplace equation with Dirichlet and Neumann boundary conditions. A 2D lens and a 3D lens were designed and fabricated. The numerical and experimental results with these lenses demonstrate excellent beam steering performance of ultrasonic waves in both near field and far field.