【摘要】 非厄米超材料通过对材料参数虚部的调控，可以实现在传统厄米系统中无法实现或不易调控的新颖现象.其中，声学共轭材料是一种基于非厄米声学原理设计的新型材料，其特点是材料有效声学参数——有效质量密度和体积压缩系数，互为共轭关系.通过对声学参数的有效调控，可以实现独特的声学现象，如声学激光模式和相干完美吸收模式.针对共轭材料对材料参数的要求极高且难以实现的问题，提出了一种共轭超材料简化设计，通过理论分析和数值模拟研究这种简化设计的特殊声学性能.研究表明，该简化设计可以实现共轭材料中的声学激光模式和相干完美吸收模式.同时，发现入射波的相位差和波束宽度不对称情况对两种模式均有明显的调控作用.研究将为设计各种声学装置，包括声学吸收器、声波激发和小声波调控等应用带来新的可能和前景.更多还原

【Abstract】 Non-Hermitian metamaterials provide novel phenomena that cannot be easily obtained in traditional Hermitian systems by regulating the imaginary part of material parameters. Among them,acoustic conjugate materials are designed on the basis of the non-Hermitian acoustic principle,in which the equivalent acoustic parameters of the material,the effective mass density and volume compression coefficient,are conjugate to each other. Acoustic conjugate materials provide unique acoustic phenomena,acoustic laser mode and coherent perfection absorption,by parameter regulation. In realization of acoustic conjugate materials,a simplified design of acoustic conjugate materials is proposed in this study and special acoustic properties are investigated by theoretical analysis and numerical simulation. It is observed that the simplified design can realize acoustic laser mode and coherent perferct absorption. Meanwhile,it is shown that the phase difference of the incident wave and the asymmetric condition of the beamwidth exert influences on the performance of the materials. This study will bring new possibilities and prospects in designing various acoustic devices,such as acoustic absorbers,acoustic excitation,and small acoustic wave modulation.更多还原