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1 April 2019 Experimental validation of acoustic valley Hall edge states in a nonresonant topological elastic waveguide (Conference Presentation)
Ting-Wei Liu, Fabio Semperlotti
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Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 1097216 (2019) https://doi.org/10.1117/12.2514328
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States
Abstract
We experimentally demonstrate the existence and the characteristics of acoustic quantum valley Hall edge states in a continuous topological elastic waveguide. The waveguide is obtained by subtractive manufacturing, hence cutting a non-resonant truss-like lattice from an initially uniform aluminum thin plate. The fabricated lattice includes two different domains characterized by broken space inversion symmetry and contrasted with each other in order to create a physical interface (i.e. a domain wall) capable of inducing a topological transition. Guided modes in the waveguide are generated using piezoelectric actuators and are measured using laser vibrometry. Data show the existence of well-confined edge states with negligible backscattering at the sharp corners along the domain wall. A methodology to precisely excite a uni-directional edge state is also demonstrated. In addition to the experiment results, the coupling between valley modes is also further investigated and linked to a chiral flux of the mechanical energy.
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Ting-Wei Liu and Fabio Semperlotti "Experimental validation of acoustic valley Hall edge states in a nonresonant topological elastic waveguide (Conference Presentation)", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 1097216 (1 April 2019); https://doi.org/10.1117/12.2514328
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KEYWORDS
Waveguides
Acoustics
Actuators
Aluminum
Backscatter
Manufacturing
Vibrometry
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