A conventional structural Luneburg lens is a symmetric circular gradient-index lens with refractive indices decreasing from the centre along the radial direction. In this paper, a flattened structural Luneburg lens (FSLL) based on structural thickness variations is designed by using the quasi-conformal transformation technique. Through numerical simulations and experimental studies, the FSLL is demonstrated to have excellent beam steering performance for the manipulation of flexural wave propagation at desired angles.

中文翻译：

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扁平的Luneburg结构透镜，用于宽带波束成形。

常规的结构吕内堡透镜是对称的圆形梯度折射率透镜，其折射率从中心沿径向方向减小。本文采用准保形变换技术，设计了一种基于结构厚度变化的扁平结构吕内堡透镜（FSLL）。通过数值模拟和实验研究，证明了FSLL具有出色的光束转向性能，可控制所需角度的弯曲波传播。