A simple mass oscillator metasurface design with linear phase shift

Abstract

In this paper, a simple mass oscillator metasurface is designed, which can regulate the phase shift of flexural wave covering 0-2π by adjusting the number of mass oscillators on the connecting bar. Based on the forced vibration theory, there is a simple approximately linear relationship between the number and phase shift of mass oscillators, which can more intuitively and accurately predict the phase of different number of mass oscillators, and then realize the metasurface design of mass oscillators with different requirements. Therefore, arbitrary regulation of flexural waves, such as abnormal refraction, beam focusing, and self-acceleration, can be realized by reasonably arranging the number of mass oscillators. The results show that the proposed metasurface can be greatly simplified both in the establishment of phase shift relation and in the fabrication of structure configuration, and will have broad application potential in the engineering field.

A broadband tunable asymmetric transmission structure design

“…It is worth noting that the asymmetric transmission structure proposed in this paper possesses a very wide tunable frequency band. For the metasurface [22], the number of mass oscillators on the connecting bar can be changed to meet the demand of different frequencies, while for the metastructure, the demand can be met by increasing or decreasing the number of mass oscillators on the connecting bar. In addition, the refraction angle can be adjusted by changing the distance between the mass oscillators.…”

“…Based on this, Xuan [21] et al proposed a one-dimensional phononic crystal-type metastructure, which can achieve the phase coverage of flexural waves by simply moving the mass oscillators, i.e., changing the distance between the mass oscillators, just like adjusting the weights on a balance. Wang et al [22] further designed a simple mass oscillator metasurface with an approximately linear phase shift with respect to the number of oscillators. It can more accurately predict the phase of the number of different mass oscillators and avoid the complex operation of querying through a large number of data.…”

“…In this paper, we propose a tunable broadband asymmetric transmission structure based on our previous work [21,22]. The structure consists of a mass oscillator metasurface and a one-dimensional phononic crystal metastructure.…”