基于声学人工透镜的超分辨聚焦  

Super-resolution focusing based on the acoustic meta-lens

作　　者：祝雪丰 陈卓 曾龙生 彭玉桂 ZHU Xuefeng;CHEN Zhuo;ZENG Longsheng;PENG Yugui(School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学物理学院,湖北武汉430074

出　　处：《物理实验》2023年第10期1-16,共16页Physics Experimentation

摘　　要：打破衍射极限实现超分辨率聚焦是声学成像和检测领域重要的追求目标之一.基于声学人工结构的超透镜对声波振幅的调制作用,分别介绍了6种声学人工透镜结构器件的设计及其聚焦成像性能,对其在突破衍射极限进而实现声调制的研究进展进行总结和比较.多带菲涅耳型声学人工透镜和锐边孔径声学人工透镜的结构简单、厚度薄且易于加工,均可以在远场打破衍射极限并实现超分辨聚焦.利用多带菲涅耳型人工透镜所获得的焦斑更小,但旁瓣强度大且靠近主瓣;锐边孔径声学人工透镜所获得的焦斑强度大且远离旁瓣.最后讨论了声人工透镜的潜在应用场景,并展望了声学人工透镜的未来发展趋势.Breaking the diffraction limit to achieve super-resolution focusing is one of the purposive goals in acoustic imaging and detection.The design of six acoustic-superlens-based devices and their focused imaging performance were presented,where the modulation of acoustic wave amplitude by using structured superlenses(meta-lens)was employed.The progress in breaking the diffraction limit and achieving acoustic modulation was summarized and compared.Multi-band Fresnel type and sharp-edge aperture acoustic lens both have the advantanges of simple structure,thin thickness,and easy processing,thus breaking the diffraction limit and super-resolution focusing in the far field could be realized.The focal spot was smaller for multi-band Fresnel type acoustic lens but the sidelobe intensity was higher and nestled against the principal lobe.Comparatively,the intensity of the focal spot was higher and separated significantly from the sandlobes for the sharp-edge aperture acoustic lens.Finally,potential applications of acoustic meta-lens were discussed,and future trends in acoustics were given.

关 键 词：声学人工透镜 声聚焦 超分辨 衍射极限 

分 类 号：TB34[一般工业技术—材料科学与工程] TP391[自动化与计算机技术—计算机应用技术] O42[自动化与计算机技术—计算机科学与技术]