Acoustic frequency filter based on anisotropic topological phononic crystals

被引：35

作者：

Chen, Ze-Guo ^{[1
]}

Zhao, Jiajun ^{[1
,3
]}

Mei, Jun ^{[2
]}

Wu, Ying ^{[1
]}

机构：

[1] King Abdullah Univ Sci & Technol, Div Comp Elect & Math Sci & Engn CEMSE, Thuwal 239556900, Saudi Arabia

[2] South China Univ Technol, Dept Phys, Guangzhou 510640, Guangdong, Peoples R China

[3] GOWell Int LLC, Houston, TX 77041 USA

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

EDGE STATES; SOUND; WAVES;

D O I：

10.1038/s41598-017-15409-2

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present a design of acoustic frequency filter based on a two-dimensional anisotropic phononic crystal. The anisotropic band structure exhibits either a directional or a combined (global + directional) bandgap at certain frequency regions, depending on the geometry. When the time-reversal symmetry is broken, it may introduce a topologically nontrivial bandgap. The induced nontrivial bandgap and the original directional bandgap result in various interesting wave propagation behaviors, such as frequency filter. We develop a tight-binding model to characterize the effective Hamiltonian of the system, from which the contribution of anisotropy is explicitly shown. Different from the isotropic cases, the Zeeman-type splitting is not linear and the anisotropic bandgap makes it possible to achieve anisotropic propagation characteristics along different directions and at different frequencies.

引用

页数：6

共 33 条

[11] Topologically robust sound propagation in an angular-momentum-biased graphene-like resonator lattice [J].

Khanikaev, Alexander B. ;

Fleury, Romain ;

Mousavi, S. Hossein ;

Alu, Andrea .

NATURE COMMUNICATIONS, 2015, 6

[12]

Khanikaev AB, 2013, NAT MATER, V12, P233, DOI [10.1038/nmat3520, 10.1038/NMAT3520]

[13]

Lu JY, 2017, NAT PHYS, V13, P369, DOI [10.1038/NPHYS3999, 10.1038/nphys3999]

[14]

Lu L, 2014, NAT PHOTONICS, V8, P821, DOI [10.1038/NPHOTON.2014.248, 10.1038/nphoton.2014.248]

[15] Guiding Electromagnetic Waves around Sharp Corners: Topologically Protected Photonic Transport in Metawaveguides [J].

Ma, Tzuhsuan ;

Khanikaev, Alexander B. ;

Mousavi, S. Hossein ;

Shvets, Gennady .

PHYSICAL REVIEW LETTERS, 2015, 114 (12)

[16] Pseudo-time-reversal symmetry and topological edge states in two-dimensional acoustic crystals [J].

Mei, Jun ;

Chen, Zeguo ;

Wu, Ying .

SCIENTIFIC REPORTS, 2016, 6

[17] The birth of topological insulators [J].

Moore, Joel E. .

NATURE, 2010, 464 (7286) :194-198

[18] Topologically protected elastic waves in phononic metamaterials [J].

Mousavi, S. Hossein ;

Khanikaev, Alexander B. ;

Wang, Zheng .

NATURE COMMUNICATIONS, 2015, 6

[19] Non-Abelian anyons and topological quantum computation [J].

Nayak, Chetan ;

Simon, Steven H. ;

Stern, Ady ;

Freedman, Michael ;

Das Sarma, Sankar .

REVIEWS OF MODERN PHYSICS, 2008, 80 (03) :1083-1159

[20] Topologically protected one-way edge mode in networks of acoustic resonators with circulating air flow [J].

Ni, Xu ;

He, Cheng ;

Sun, Xiao-Chen ;

Liu, Xiao-ping ;

Lu, Ming-Hui ;

Feng, Liang ;

Chen, Yan-Feng .

NEW JOURNAL OF PHYSICS, 2015, 17

← 1 2 3 4 →