| 基于近零折射率材料的声非对称聚焦透镜 |
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| 引用本文： | 夏建平,葛勇,孙宏祥,袁寿其,司乔瑞,方欣,张淑仪,刘晓峻.基于近零折射率材料的声非对称聚焦透镜[J].声学学报,2019,44(4):765-771. |
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| 作者姓名： | 夏建平 葛勇 孙宏祥 袁寿其 司乔瑞 方欣 张淑仪 刘晓峻 |
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| 作者单位： | 1. 江苏大学流体机械工程技术研究中心 理学院 镇江 212013; |
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| 基金项目： | 国家自然科学基金项目(11774137,51779107)江苏省六大人才高峰项目(GDZB-019)江苏高校青蓝工程项目中国博士后基金项目(2017M621643)江苏省高校自然科学研究项目(18KJB140003)江苏省研究生科研与实践创新计划项目(KYCX171754)资助 |
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| 摘 要： | 研究基于近零折射率声子晶体的声非对称聚焦透镜。声非对称聚焦透镜的两侧分别为竖直平面与圆弧面结构,由于近零折射率材料的声波方向选择性,当声波从竖直平面一侧入射时,可以通过透镜,实现高性能声聚焦效应;而当声波从圆弧面一侧任意方向入射时,声波无法通过透镜,从而实现同时具有聚焦与非对称传输特性的声学透镜。在此基础上,改变透镜圆弧面的曲率半径,可以调控非对称透镜的正向聚焦焦点位置,且声非对称传输性能保持不变.此外,透镜内部的刚性散射体对声非对称聚焦性能的影响较小。研究结果表明所设计的声非对称聚焦透镜具有多功能、单一结构及高鲁棒性等优点,为设计新型近零折射率声学器件提供相应的理论方案与实验参考.
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| 关 键 词： | 声学超材料 近零折射率 声非对称聚焦 |
| 收稿时间： | 2018-08-17 |
Acoustic asymmetric focusing lens by near-zero refractive index material |
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| Affiliation: | 1. Research Center of Fluid Machinery Engineering and Technology, Faculty of Science, Jiangsu University Zhenjiang 212013;2. Lab. of Modem Acoustics、Institute of Acoustics, Nanjing University Nanjing 210093;3. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190 |
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| Abstract: | An acoustic asymmetric focusing lens based on a near-zero refractive index sonic crystal is studied,in which the left and right sides of the lens are vertical and circular planes,respectively.The acoustic wave which is incident from the side of the vertical plane surface can transmit through the lens and realize acoustic focusing with high performance.However,at the other side of the lens,the acoustic wave cannot pass through the lens with arbitrary incident directions,which arises from the direction selection mechanism of acoustic waves in near-zero refractive index materials.Therefore,the proposed lens can realize asymmetric transmission and focusing effects simultaneously.Besides,the focal length can be manipulated by changing the curvature radius of the lens,and the rigid scatterers inside the lens almost have no influence on the acoustic asymmetric focusing performance.The proposed lens has the advantages of multi-function,single type structure and high robustness,which provides theoretical solutions and experimental references for designing acoustic devices with asymmetric focusing effect based on near-zero refractive index materials. |
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