In this article, the concept of topological rainbow is introduced into the plate-mode waves system of 1D phononic crystal slabs, achieving adjustable topological elastic rainbow trapping by employing gradient-tuned Su-Schrieffer-Heeger (SSH) structures. First, based on the classical SSH model, a phononic crystal slab composed of steel and aluminum is set up, and the band structure of plate-mode waves is studied using the finite-element method. Band inversion can be induced by changing the height of the steel in the unit cell, leading to topological phase transitions. Then, phononic crystals wi...
