Tunable topological states of one-dimensional dielectric laminates

This paper investigates the tunable topological states in one-dimensional dielectric elastomer (DE) laminates, aiming to explore active control mechanisms for topological phononic crystals (PCs). Utilizing DE materials capable of significant deformation under external electric fields, the study examines how interface modes are influenced by energy band transitions induced by breaking spatial-inversion symmetry. A theoretical model of the incremental wave in the DE laminate based on nonlinear electroelasticity is developed, and numerical calculations are performed using the Transfer Matrix Method (TMM) and Finite Element Method (COMSOL). Key findings reveal that the position of topological phase transition points can be precisely controlled by changing the external electric field, thereby enabling the opening and closing of bandgaps (BGs) and the emergence of interface states. The results demonstrate the potential of DE-based PCs for advanced applications in acoustic manipulation and adaptive materials, highlighting their transformative role in dynamic wave control.