Experimental realization of hyperlens for sound waves based on a topology-optimized hyperbolic acoustic metamaterial

被引：0

作者：

Park, Sang Uk ^{[1
]}

Lee, Sangyeop ^{[2
]}

Song, Kyungjun ^{[2
]}

Hyun, Jaeyub ^{[1
]}

机构：

[1] Pukyong Natl Univ, Dept Mech Engn, 45 Yongso Ro, Busan 48513, South Korea

[2] Pusan Natl Univ, Dept Mech Engn, Busan 46241, South Korea

来源：

APPLIED ACOUSTICS | 2025年 / 231卷

关键词：

Hyperbolic acoustic metamaterial; Homogenization; Effective mass density; Bloch mode; Diffraction limit; Topology optimization; DESIGN; HOMOGENIZATION;

D O I：

10.1016/j.apacoust.2024.110516

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The imaging of tiny objects within deep-subwavelength ranges is essential for applications such as nondestructive evaluations and sonar systems. To achieve super-resolution imaging, this study proposes a hyper- lens based on a systematically designed hyperbolic acoustic metamaterial (HAMM). A two-step inverse design process is introduced: first, a conceptual HAMM unit cell is generated via topology optimization, followed by fine-tuning of geometrical parameters. Effective material properties are calculated using a field-averaging homogenization method, and the optimized HAMM's characteristics are analyzed through time-harmonic and dispersion analyses. The super-resolution imaging performance of the hyperlens is demonstrated both numerically and experimentally, confirming its ability to overcome the diffraction limit.

引用

页数：20