There are growing efforts in constructing topological edge states inclassical wave system. However, most of the work study the existence, creationand properties of the edge states, and the demonstration of application ishighly desirable. Here, we present our design of a two-dimensional anisotropicphononic crystal that exhibits tunable topological phases. We further explorethe contribution of anisotropy and show that the bandgap topology is alsorelated to particular directions and frequency. Such frequency dependentbehavior can be utilized as a frequency filter.
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