Manipulating Backward Propagation of Acoustic Waves by a Periodical Structure
Zheng Xu1 , Meng-Lu Qian1 , Qian Cheng1** , Xiao-Jun Liu2**
1 Institute of Acoustics, Tongji University, Shanghai 2000922 School of Physics, Nanjing University, Nanjing 210093
Abstract ：In the backward propagation of acoustic waves, the direction of phase velocity is anti-parallel to that of group velocity. We propose a scheme to manipulate the backward propagation using a periodical structure. The dynamic backward propagation process is further experimentally observed. It is demonstrated that the oblique incident plane wave moves backward when it travels through the periodical structure and the backward shift can be controlled within a certain range.
收稿日期: 2016-08-01
出版日期: 2016-11-28
:
43.35.+d
(Ultrasonics, quantum acoustics, and physical effects of sound)
43.20.+g
(General linear acoustics)
46.40.-f
(Vibrations and mechanical waves)
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2016, Vol. 33 
