Manipulation of invisible cloaking in PT-symmetric thermoacoustic dimer  

作　　者：Haixiao Zhang Bolun Hu Wei Xiong Ying Cheng Xiaojun Liu 

机构地区：[1]Department of Physics,MOE Key Laboratory of Modern Acoustics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]School of Electrical and Information Engineering,Changzhou Institute of Technology,Changzhou 213032,China [3]State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第12期136-141,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFA1404400);the National Natural Science Foundation of China(Grant Nos.11834008,11904035,12074183,12225408,and 12227809);the Qing Lan Project of Jiangsu Province;the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.23KJD140001);Changzhou Sci&Tech Program(Grant No.CJ20220256)。

摘　　要：Making the propagation of sound waves immune to interference from obstacles with high transmission efficiency is a long-term pursuit in acoustic science and engineering.Recent proposal pointed out that perfect transmission through obstacles can be achieved by deploying a bulky gain-loss distribution in parity-time(PT)symmetry.Here we demonstrate a modified methodology to achieve the extraordinary physical property of acoustic cloaking accompanied by perfect transmission at the exceptional points(EPs).Systematically probing reveals two complementary solutions of EPs corresponding to acoustic cloaking,in the system composed of an equivalent medium slab sandwiched by a pair of PT-symmetric admittance metasurfaces.To model the crucial acoustic gains that are not present in nature,we employ actively controlled ultra-thin carbon nanotube dimer films to mimic admittance metasurfaces perfectly via thermoacoustic effect,and manipulate acoustic cloaking over a wide frequency band in experiments.This divergent strategy releases restrictions on the operating frequency,shape and size of the obstacle,which can be applied to acoustic sensing,directional imaging,and other related wave disciplines.

关 键 词：acoustic cloaking PT-symmetric metasurfaces thermoacoustic carbon nanotube(CNT)dimer 

分 类 号：O42[理学—声学]