In the biomedical field, flexible acoustic manipulations of high-flux particles play a key role in integrated biomedical detections. Therefore, it is important to propose a method to realize a large-area waveguide with tunable energy concentration and amplification. In this work, by using coupled effect of stepped width of large-area pseudo-spin topological waveguide and rainbow trapping, a tunable energy concentrator is obtained. The results show that the coupled system can be used to tune energy concentration and amplification flexibly, which can amplify the acoustic pressure by 58 times. Moreover, due to the system's tunability, the position of energy concentration and amplification can also be adjusted conveniently. The results present an effective method to tune acoustic energy-intensity amplifications, which is vital in the application fields of acoustic particle manipulation and energy localization.
Wu et al. (Sun,) studied this question.