[1]赵玉萍,梁彬,程建春.基于轻薄硬质超表面的空气声波反射场操控[J].中国材料进展,2021,40(01):022-28.[doi:10.7502/j.issn.1674-3962.202005026]
　ZHAO Yuping,LIANG Bin,CHENG Jianchun.Manipulation of Reflected Airborne Sound by Using Ultra-Thin and Lightweight Metasurface with Mechanical Rigidity[J].MATERIALS CHINA,2021,40(01):022-28.[doi:10.7502/j.issn.1674-3962.202005026]
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基于轻薄硬质超表面的空气声波反射场操控()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
40
期数:
2021年第01期
页码:
022-28
栏目:
出版日期:
2021-01-30

文章信息/Info

Title:
Manipulation of Reflected Airborne Sound by Using Ultra-Thin and Lightweight Metasurface with Mechanical Rigidity
文章编号:
1674-3962(2021)01-0022-07
作者:
赵玉萍; 梁彬; 程建春
（南京大学物理学院 近代声学教育部重点实验室 人工微结构科学与技术协同创新中心，江苏 南京 210093）
Author(s):
ZHAO Yuping; LIANG Bin; CHENG Jianchun
(Key Laboratory of Modern Acoustics of Ministry of Education， Collaborative Innovation Center of Advanced Microstructures， Department of Physics，Nanjing University，Nanjing 210093，China)
关键词:
声学; 超表面; 声波操控; 异常折射; 超薄平面聚焦透镜; 超薄平面棱锥镜
Keywords:
acoustics; metasurface; acoustic manipulation; anomalous reflection; ultrathin planar focusing lens; ultrathin flat acoustic axicon
分类号:
O42
DOI:
10.7502/j.issn.1674-3962.202005026
文献标志码:
A
摘要:
对反射声波的复杂操控是声学研究的基础问题之一，并广泛应用于房间声学设计及噪声能量消除等重要场合。近年来出现的声学超表面为声学功能器件的小型化提供了新的启示，因此如何进一步缩减其尺寸和重量具有重要的物理意义与应用价值。展示了一种轻薄超表面结构对低频空气声波所产生反射声场的高效、精准操控。通过理论计算证明了利用简单的扁平中空结构，可在不显著牺牲能量反射率及结构强度的前提下，通过调控单个结构参数产生0~2π范围内的反射相位，同时避免了制备难度高和增加器件重量的复杂内部结构，因此具有尺寸超薄（λ0/20）、重量轻盈、反射率高及制备简单等优势。通过实现任意角度的异常反射、基于超薄平面透镜的可调声聚焦、构建平面棱锥镜产生类贝塞尔声束3个典型例子展示了该器件对反射声波的丰富操控性能。实现基于轻薄超表面对反射声场的操控，有助于新型平面声学器件的研究与应用，并有望在建筑声学、噪声控制、扬声器设计等领域中产生重要价值。
Abstract:
Complicated manipulation of reflected acoustic waves is of fundamental significance in acoustics, with wide applications in various important situations, such as the improvement of acoustic quality in rooms and elimination of undesired noise. In recent years, the acoustic metasurface has provided new inspiration for the miniaturization of acoustic functional devices, therefore it would be physically and practically important to further reduce the size and weight of acoustic metasurfaces. In this paper, a lightweight and ultrathin acoustic metasurface for high-efficiency and precise manipulation of low-frequency reflected airborne sound is introduced. Based on theoretical calculation, it is proven that the metasurface unit cell with a simple planar hollow structure enables free control of reflected phase over the full 0~2π range via adjustment of one sole structural parameter, with no need of sacrifice of energy reflectivity and mechanical rigidity or sophisticated inner structures that would increase the fabrication difficulty and device weight. Hence the resulting device has advantages of ultrathin thickness (of λ0/20), light weight, high reflection efficiency and simple and low-cost design. The performance of the designed metasurface is demonstrated via three distinctive examples of anomalous reflection with arbitrary angle, ultrathin acoustic planar lens for focusing acoustic energy and production of Bessel-like beam based on ultrathin flat acoustic axicon. The realization of flexible manipulation of reflected sound by using lightweight and ultrathin metasurface helps to promote the novel acoustic planar devices and their applications, and may have important implication in many diverse scenarios ranging from architectural acoustics to noise control to loudspeaker design.

备注/Memo

备注/Memo:
收稿日期：2020-05-19修回日期：2020-06-23 基金项目：国家重点研发计划项目（2017YFA0303700）；国家自然科学基金项目（11634006，11374157，81127901）第一作者：赵玉萍，女，1993年生，硕士研究生通讯作者：梁彬，男，1980年生，教授，博士生导师， Email:liangbin@nju.edu.cn
更新日期/Last Update: 2020-12-30