Robust and Reconfigurable Waveguide Design in Valley-Topological Phononic Crystals

Md. Shuzon Ali; Yusuke Hata; Motoki Kataoka; Masaaki Misawa; Kenji Tsuruta

doi:10.4028/p-JT9ZkN

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Development of Functionally Graded Metal-Ceramic Systems by Directed Energy Deposition: A Review
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Magnetic Semiconductors from Ferromagnetic Amorphous Alloys
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Effects of Thermomechanical Treatments on Tensile Properties of Pure Titanium
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Development of Soft Magnetics Fe-B-C-Si Amorphous Alloys with High Magnetization and Sufficient Amorphous-Forming Ability
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Development of Giant Magnetostrictive Materials for an Active Noise Control System in an Ultracompact Electric Vehicle
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Robust and Reconfigurable Waveguide Design in Valley-Topological Phononic Crystals
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HomeMaterials Science ForumMaterials Science Forum Vol. 1107Robust and Reconfigurable Waveguide Design in...

Robust and Reconfigurable Waveguide Design in Valley-Topological Phononic Crystals

Abstract:

As an analogy of topological insulators and superconductors, “topological phononics”, which applies the concept of band topology to acoustic dispersion, has attracted increasing attention in recent years. We present design of topological acoustic/elastic waveguides in phononic crystals. Topological waveguides are designed from the phonon dispersion analyses by finding edge modes appearing at interfaces between phononic crystals with different band topologies. As a prototype model, we first designed the topological waveguides in kHz regimes. Experimental validation of the designed waveguide has been performed in the frequency region via laser-doppler measurements. The robustness of the waveguide propagation against defects, corners, and structural inaccuracy in the waveguide has been quantitatively evaluated. We also introduced a structural transition of local symmetry inversion in the phononic crystal to implement a reconfigurability into the waveguide .Further development toward GHz regime will pave the way to the development of next-generation information devices using the proposed structures as an alternative or complimentary approach.