title: Effects of shapes and symmetries of scatterers on acoustic dual-negative refraction.
abstract: The potential operating conditions of acoustic dual-negative refraction (ADNR) are investigated by band structure theory for scatterers with different shapes and symmetries. Specifically, two types of lattices (triangular and honeycomb) and four different shapes of scatterers (circle, hexagon, square and triangle) are considered. Based on the generation mechanism of the ADNR effect, which is dependent on the frequency of the incident wave at the overlapping second and third Bloch bands, the optimum operating frequencies of ADNR with different crystal structures are given. The calculations demonstrate that the ADNR effect can be generated at the normalized frequency from 0.8 to 1.05.
authors.affiliation: Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China. wangxx1986@gmail.com
authors.forename: Yu-ran
authors.initials: YR
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Shu-yi
authors.initials: SY
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Fan
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D004867:Equipment Design; D008962:Models, Theoretical; D015394:Molecular Structure; D009038:Motion; D011312:Pressure; D012542:Scattering, Radiation; D013016:Sound; D013193:Stainless Steel; D013997:Time Factors; D014867:Water
chemical_list: D014867:Water; D013193:Stainless Steel