AI Article Synopsis
- The study introduces a new acoustic frequency filter using a two-dimensional anisotropic phononic crystal, which exhibits unique bandgaps based on its geometry.
- When time-reversal symmetry is disrupted, a topologically nontrivial bandgap can form, leading to intriguing wave propagation behaviors, including frequency filtering.
- The researchers utilize a tight-binding model to analyze the system's effective Hamiltonian, highlighting how anisotropy affects wave propagation in different directions and frequencies, differing from isotropic cases.
Article Abstract
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.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5678146 | PMC |
| http://dx.doi.org/10.1038/s41598-017-15409-2 | DOI Listing |
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