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Novel acoustic flat focusing based on the asymmetric response in parity-time-symmetric phononic crystals.
Yang, Hang; Zhang, Xin; Liu, Yuechang; Yao, Yuanwei; Wu, Fugen; Zhao, Degang.
Afiliación
  • Yang H; School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
  • Zhang X; School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China. phxzhang@gdut.edu.cn.
  • Liu Y; School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
  • Yao Y; School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
  • Wu F; School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
  • Zhao D; School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Sci Rep ; 9(1): 10048, 2019 Jul 11.
Article en En | MEDLINE | ID: mdl-31296887
We present a two-dimensional (2D) parity-time-symmetric (PT-symmetry) phononic crystals (PCs) with balanced gain and loss medium. Using the super cell method of rectangular lattice, we exhibit the thresholdless spontaneous PT-symmetry breaking in the band structure. The numerical results show that the asymmetric scattering properties obviously occur in a non-Hermitian system. At two specific incident frequencies, unidirectional reflectionless and perfect transmission behaviors exist individually in opposite directions, which are accompanied by a phase transition of π. Based on the generalized Snell's law, combining such a PT-symmetric medium, we design a novel metamaterial crystal for PT-symmetric acoustic flat focusing. Its focus frequency can also be modulated by the gain/loss parameter. The novel flat focusing based on the PT-symmetry that we propose opens a new door for high-dimensional applications of non-Hermitian metamaterials in acoustic wave manipulation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido