基于声学超材料的无源声学循环器的设计
发布时间：2019-05-07 03:45
【摘要】：近年来,新型声学器件的发展迅速,比如声学二极管的提出,类比于传统的电学二极管,实现了对声波的整流和非互易(或非对称)的声传播.随后,声学晶体管也被理论上设计和提出.作为新型的声学概念型设备,声学器件呈现了从简单的二端口向三多口甚至多端口的发展趋势(比如声学二极管到晶体管).另一方面,声学超材料是近10年来的热门研究话题.利用声学超材料的亚波长共振效应,可以实现丰富的功能,包括声学斗篷,声学幻像,聚焦透镜,涡旋场和任意波束形成.将超材料单元引入一个旋转对称的多端口系统,实现了无源的复杂声学网络中的声学路径操控.证明了当超材料提供了打破左右对称的附加波矢后,声学系统中只允许向右(或向左)传播.因此实现了声波只能逆时针传播(或顺时针)的无源声学循环器.解析分析了每个超材料单元对声波的偏转角度来预测声传播路线.最后,进一步将三端口循环器拓展到更多端口的情况.
[Abstract]:In recent years, the rapid development of new acoustic devices, such as the introduction of acoustic diodes, analog to the traditional electrical diodes, the realization of sound wave rectification and non-reciprocal (or asymmetric) sound propagation. Subsequently, acoustic transistors are also designed and proposed in theory. As a new type of acoustic conceptual equipment, acoustic devices show a trend from simple two-port to three-port or even multi-port (such as acoustic diode to transistor). On the other hand, acoustic metamaterials have been a hot research topic in the last 10 years. By using the subwavelength resonance effect of acoustic supermaterial, we can achieve a wealth of functions, including acoustic cloak, acoustic illusion, focusing lens, vortex field and arbitrary beamforming. The supramaterial element is introduced into a rotationally symmetric multi-port system to realize the acoustic path control in passive complex acoustic networks. It is proved that only the propagation to the right (or to the left) is allowed in the acoustic system when the supermaterial provides additional wave vectors that break the left-left symmetry. Therefore, the passive acoustic circulator which can only propagate counterclockwise (or clockwise) is realized. The deflection angle of each metamaterial element to sound wave is analytically analyzed to predict the propagation path of sound wave. Finally, the three-port circulator is further extended to more ports.
【作者单位】： 南京大学声学研究所;南京大学微结构与创新协同中心;
【基金】：国家973计划(2011CB7097900;2012CB921504) 国家自然科学基金(11174138;11174139;11222442;81127901)
【分类号】：TB51
[Abstract]:In recent years, the rapid development of new acoustic devices, such as the introduction of acoustic diodes, analog to the traditional electrical diodes, the realization of sound wave rectification and non-reciprocal (or asymmetric) sound propagation. Subsequently, acoustic transistors are also designed and proposed in theory. As a new type of acoustic conceptual equipment, acoustic devices show a trend from simple two-port to three-port or even multi-port (such as acoustic diode to transistor). On the other hand, acoustic metamaterials have been a hot research topic in the last 10 years. By using the subwavelength resonance effect of acoustic supermaterial, we can achieve a wealth of functions, including acoustic cloak, acoustic illusion, focusing lens, vortex field and arbitrary beamforming. The supramaterial element is introduced into a rotationally symmetric multi-port system to realize the acoustic path control in passive complex acoustic networks. It is proved that only the propagation to the right (or to the left) is allowed in the acoustic system when the supermaterial provides additional wave vectors that break the left-left symmetry. Therefore, the passive acoustic circulator which can only propagate counterclockwise (or clockwise) is realized. The deflection angle of each metamaterial element to sound wave is analytically analyzed to predict the propagation path of sound wave. Finally, the three-port circulator is further extended to more ports.
【作者单位】： 南京大学声学研究所;南京大学微结构与创新协同中心;
【基金】：国家973计划(2011CB7097900;2012CB921504) 国家自然科学基金(11174138;11174139;11222442;81127901)
【分类号】：TB51
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