Journal
ADVANCED MATERIALS
Volume 30, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805002
Keywords
acoustic topological insulators; logic gates; programmable coding devices; pseudospin-dependent edge modes
Categories
Funding
- National Basic Research Program of China [2017YFA0303702]
- National Natural Science Foundation of China [11774137, 51779107, 11834008]
- Six Talent Peaks Project in Jiangsu Province [GDZB-019]
- State Key Laboratory of Acoustics, Chinese Academy of Sciences [SKLA201813]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17_1754]
- Jiangsu Qing Lan Project
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Topological acoustics has recently revolutionized fundamental concepts of acoustic propagation, giving rise to strikingly unique acoustic edge modes immune to backscattering. Despite the rapid progress in this field, simultaneous realization of reconfigurability, intelligentization, and automatic control over acoustic propagation paths is posing a great challenge. This challenge is overcome by proposing the concept of a programmable acoustic topological insulator based on two digital elements 0 or 1, which consist of honeycomb-lattice sonic crystals made of cylindrical rods with different diameters. The acoustic propagation paths in the topological insulators can be controlled automatically by programming different coding sequences, which arises from efficient transformation of pseudospin-dependent edge modes on both interfaces of the digital elements. More importantly, a unique unit is experimentally fabricated that has either a 0 or 1 response automatically manipulated by an air cylinder, and design topological insulators with programmable functionality, to realize three digital acoustic devices, such as a single-pole double-throw switch, a single-pole single-throw switch, and a tunable logic gate. The proposed programmable topological insulators may enable future intelligent acoustic devices with exciting reconfigurable and programmable functionalities, which may lead to important advances in various applications, such as integrated acoustics, acoustic security, and information processing.
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