Reconfigurable topological phononic crystal slabs

Publication date: Available online 20 June 2018Source: Physics Letters AAuthor(s): Lu-yang Feng, Hong-bo Huang, Jian-cheng Zhang, Xiao-ping Xie, Jiu-jiu ChenAbstractWe propose two-dimensional reconfigurable phononic crystal slabs that support topologically protected edge states for Lamb waves. It consists of a triangular lattice of triangular-like air holes perforated in a slab and two sandwich cylinders are placed in the matrix of each unit cell. The pseudospin–orbit coupling is achieved by shifting the sandwich cylinders up or down. The robust transport of Lamb waves along reconfigurable interfaces is further demonstrated. The dynamically reconfigurable design provides an excellent platform for tuning the frequency range of topological edge states and steering efficient transport of Lamb waves along arbitrary pathways, which can be employed for elastic-wave communications, signal processing, and sensing.

Source: Physics Letters A - July 10, 2018 Category: Physics Source Type: research