Journal
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
Volume 29, Issue 28, Pages 7772-7780Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15376494.2021.2006838
Keywords
Pillared phononic crystal; valley-locked waveguide state; valley Hall effect; elastic wave; broadband
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An elastic wave broadband topological valley-locked waveguide state (TVWS) with adjustable mode width is achieved by adjusting the height of triangular pillars in a phononic crystal plate with asymmetric double-sided pillars. The TVWS features gapless dispersion and robustness against bends and disorders, and allows for the demonstration of an elastic valley-locked waveguide splitter with variable mode width.
Here, a broadband topological valley-locked waveguide state (TVWS) of elastic wave with adjustable mode width is reported in the phononic crystal plate with asymmetric double-sided pillars. The broadband topological bandgap is achieved by adjusting the height of triangular pillars. The TVWS with adjustable mode width is realized by adding a pillared phononic crystal (PPnC) with Dirac points between two valley PPnCs with distinct topological phase. The TVWS of elastic wave exhibits the properties of gapless dispersion and robustness against bends and disorders. Based on the TVWS, an elastic valley-locked waveguide splitter with variable mode width is further demonstrated.
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