Topological phononic states of underwater sound based on coupled ring resonators
- 18 January 2016
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 108 (3), 031904
- https://doi.org/10.1063/1.4940403
Abstract
We report a design of topological phononic states for underwater sound using arrays of acoustic coupled ring resonators. In each individual ring resonator, two degenerate acoustic modes, corresponding to clockwise and counter-clockwise propagation, are treated as opposite pseudospins. The gapless edge states arise in the bandgap resulting in protected pseudospin-dependent sound transportation, which is a phononic analogue of the quantum spin Hall effect. We also investigate the robustness of the topological sound state, suggesting that the observed pseudospin-dependent sound transportation remains unless the introduced defects facilitate coupling between the clockwise and counter-clockwise modes (in other words, the original mode degeneracy is broken). The topological engineering of sound transportation will certainly promise unique design for next generation of acoustic devices in sound guiding and switching, especially for underwater acoustic devices.Keywords
Funding Information
- Academic Program Development of Jiangsu Higher Education (PAPD)
- National Basic Research Program of China (No. 2012CB921503 and No. 2013CB632702)
- National Nature Science Foundation of China (No. 1134006, No. 11474158, and No. 11404164)
This publication has 37 references indexed in Scilit:
- Imaging topological edge states in silicon photonicsNature Photonics, 2013
- Topological insulators and superconductorsReviews of Modern Physics, 2011
- Robust optical delay lines with topological protectionNature Physics, 2011
- Colloquium: Topological insulatorsReviews of Modern Physics, 2010
- Observation of unidirectional backscattering-immune topological electromagnetic statesNature, 2009
- A topological Dirac insulator in a quantum spin Hall phaseNature, 2008
- Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic CrystalPhysical Review Letters, 2008
- Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal SymmetryPhysical Review Letters, 2008
- Quantized Hall Conductance in a Two-Dimensional Periodic PotentialPhysical Review Letters, 1982
- New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall ResistancePhysical Review Letters, 1980