We present a design to achieve antichiral edge states in acoustic systems where edge states on the two parallel edges of a lattice with a strip geometry propagate in the same direction. This peculiar phenomenon is realized by using a honeycomb lattice consisting of acoustic resonators with staggered air flow; i.e., the air flow takes opposite directions in resonators belonging to different sublattices. The existence of antichiral edge states is revealed through full-wave simulations of the band structure and acoustic fields excited by a point source. Furthermore, we compare these antichiral edge states with conventional chiral edge states. It is found that the antichiral edge states are less robust than the chiral ones. Our work offers new possibilities for dispersion engineering and wave manipulations in acoustics.
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21 June 2021
Research Article|
June 15 2021
Antichiral edge states in an acoustic resonator lattice with staggered air flow
Special Collection:
Acoustic Metamaterials 2021
Letian Yu
;
Letian Yu
1
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University
, Singapore 637371, Singapore
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Haoran Xue
;
Haoran Xue
a)
1
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University
, Singapore 637371, Singapore
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Baile Zhang
Baile Zhang
b)
1
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University
, Singapore 637371, Singapore
2
Centre for Disruptive Photonic Technologies, Nanyang Technological University
, Singapore 637371, Singapore
b)Author to whom correspondence should be addressed: blzhang@ntu.edu.sg
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b)Author to whom correspondence should be addressed: blzhang@ntu.edu.sg
Note: This paper is part of the Special Topic on Acoustic Metamaterials 2021.
J. Appl. Phys. 129, 235103 (2021)
Article history
Received:
March 17 2021
Accepted:
June 01 2021
Citation
Letian Yu, Haoran Xue, Baile Zhang; Antichiral edge states in an acoustic resonator lattice with staggered air flow. J. Appl. Phys. 21 June 2021; 129 (23): 235103. https://doi.org/10.1063/5.0050645
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