Refined acoustic holography via nonlocal metasurfaces  

作　　者：Shuhuan Xie Hongyu Ma Junmei Cao Fangshuo Mo Qian Cheng Yong Li Tong Hao 

机构地区：[1]Institute of Acoustics,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China [2]Center for Spatial Information Science and Sustainable Development Applications,Tongji University,Shanghai 200092,China [3]College of Surveying and Geo-Informatics,Tongji University,Shanghai 200092,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第7期113-123,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant Nos.2020YFA0211400,and 2020YFA0211402);the National Natural Science Foundation of China(Grant Nos.42074179,11774266,92263208,and 12074286);the Shanghai Science and Technology Committee(Grant No.21JC1405600)。

摘　　要：Holography can provide the desired wavefront phase and/or amplitude for imaging,particle manipulation,bacteria trapping,and cell patterning in optics and acoustics.However,previous work on acoustic holography is mostly based on local design optimization,either using active control of the sound source or relying on the structural design to provide the desired wavefront.Achieving precise control over the acoustic field remains a significant challenge.Here,we realize refined single-plane symmetric binary amplitude,asymmetric intensity gradient amplitude,and bi-objective hologram through the non-local holographic imaging theory that considers the acoustic coupling of structural units in detail.By taking into account the self-radiation and mutual radiation between many small units on a plate of well-designed thickness,as well as the transmission through the plate's apertures,we can effectively regulate the sound field behind the plate.We demonstrate the effectiveness of our approach through numerical simulations and experiments,showcasing a circle,a black hole,and a bi-objective with a circle and a square hologram.Notably,the acoustic black hole hologram precisely reconstructs the intensity gradient distribution at two bright spots.This non-local holographic imaging theory is valuable for the fine-intensity regulation of the sound field and is expected to be applied in ultrasound diagnosis and treatment,medical imaging,and other fields.

关 键 词：acoustic holograms non-local interactions fine intensity modulation acoustic metasurfaces 

分 类 号：TN26[电子电信—物理电子学]