Tunable Double-Band Perfect Absorbers via Acoustic Metasurfaces with Nesting Helical Tracks  

作　　者：Shu-Huan Xie Xinsheng Fang Peng-Qi Li Sibo Huang Yu-Gui Peng Ya-Xi Shen Yong Li Xue-Feng Zhu 解书欢;房鑫盛;李鹏奇;黄思博;彭玉桂;沈亚西;李勇;祝雪丰(School of Physics and Innovation Institute,Huazhong University of Science and Technology,Wuhan 430074;Institute of Acoustics,School of Physics Science and Engineering,Tongji University,Shanghai 200092)

机构地区：[1]School of Physics and Innovation Institute,Huazhong University of Science and Technology,Wuhan 430074 [2]Institute of Acoustics,School of Physics Science and Engineering,Tongji University,Shanghai 200092

出　　处：《Chinese Physics Letters》2020年第5期64-68,共5页中国物理快报（英文版）

基　　金：National Natural Science Foundation of China(Grant Nos.11674346;11704284;11690030;and 11690032);Bird Nest Plan of HUST。

摘　　要：We propose a design of tunable double-band perfect absorbers based on the resonance absorption in acoustic metasurfaces with nesting helical tracks and deep-subwavelength thicknesses(<λ/30 withλbeing the operation wavelength).By rotating the cover cap with an open aperture on the nesting helical tracks,we can tailor the effective lengths of resonant tubular cavities in the absorber at will,while the absorption peak frequency is flexibly shifted in spectrum and the acoustic impedance is roughly matched with air.The simulated particle velocity fields at different configurations reveal that sound absorption mainly occurs at the open aperture.Our experiment measurements agree well with the theoretical analysis and simulation,demonstrating the wide-spectrum and tunable absorption performance of the designed flat acoustic device.

关 键 词：TUNABLE ABSORBER absorption 

分 类 号：TN751.2[电子电信—电路与系统]