1 西北工业大学机电学院，西安 710072
2 西安交通大学电气工程学院，西安 710049
本文首先利用有限元仿真软件COMSOL计算了二维手性声子晶体的带隙，分析了散射体参数与韧带涂层参数变化对带隙的影响规律。在此基础上，确定手性声子晶体带隙最优设计的有效参数设计空间；然后基于ISIGHT优化设计平台嵌入遗传算法，开展二维手性声子晶体带隙的最优设计。在带隙的最优设计过程中，先以二维手性声子晶体的有效构型参数为设计变量，相对带隙宽度最大为目标，设计手性声子晶体单胞构型。再以此优化单胞构型为初始构型，以手性声子晶体的有效材料参数为设计变量，相对带隙宽度最大为目标，进一步实现二维手性声子晶体带隙的最优设计。本工作极大限度地挖掘了二维手性声子晶体带隙最优设计潜能，为充分发挥手性声子晶体在减振降噪中的作用提供了可靠有效的分析设计方法。
手性声子晶体 带隙特性 遗传算法 优化设计 chiral phononic crystal band-gap property genetic algorithm optimization design
Author Affiliations
Abstract
1 Research & Development Institute in Shenzhen, Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, and Department of Applied Physics, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi’an 710072, China
2 School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
3 e-mail: fuquanhong@nwpu.edu.cn
4 e-mail: fuli.zhang@nwpu.edu.cn
The active control of electromagnetic response in metamaterial and mutual coupling between resonant building blocks is of fundamental importance in realizing high-quality metamaterials. In this work, we propose and experimentally demonstrate the tunabilities of symmetry-broken metasurfaces made of orthogonal electric dipolar resonators. The metasurface with vertical and horizontal wires is integrated with a PIN diode for active control. It is found that the electromagnetically induced transparency (EIT)-like spectrum appears due to the destructive or constructive interferences between the two electric dipolar modes when the structural symmetry broken is introduced to the metasurface. Different from previous works on the EIT-like effect, there is only electric dipole response in our metasuface. The microscopic response of the metasurface is numerically calculated to illustrate the mode coupling between the orthogonal electric dipolar resonators. By applying temporal coupled-mode theory, the interaction between the electromagnetic wave and the symmetry-broken metasurface is described, and the characteristic parameters of the resonator system, which determine the electromagnetic response of the metasurface, are acquired.
Photonics Research
2019, 7(9): 09000955
