Abstract
With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. In this letter, we report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. Compared with the previous ones that have inhomogeneous parameter distributions, the designed devices are composed of several parts with homogeneous parameters, which can be achieved with the help of few homogeneous layered structures. Simulations are also performed to verify the functions of the designed device. The proposed acoustic concentrators and rotators would be useful in numerous applications such as acoustic sensing and communication.
Highlights
With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave
We proposed acoustic concentrator and rotator based on linear coordinate transformation
It was observed that the acoustic wave in the designed device was concentrated by the concentrator into the compressive region i.e., the internal square
Summary
With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. We report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. More researches about acoustic concentrators[22,23] and rotators[21,24,25] emerged, that can magnify the intensity or rotate the propagation direction of the acoustic wave in the internal region and keep external field unchanged. We proposed acoustic concentrator and rotator based on linear coordinate transformation. The performances of the designed devices are validated with numerical simulations, which show good agreement with the theoretical prediction This method can be extended to other acoustic devices, which may find potential applications in various areas e.g. underwater communication and medical ultrasound therapy
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