Two-dimensional chessboard sound wave regulation and control metasurface structure with gradient change

The invention relates to a chessboard sound wave regulation and control metasurface structure with two-dimensional gradient change, the chessboard metasurface structure is composed of a plurality of narrow well units filled with different materials, and the depths of the narrow wells are arranged according to a gradient change rule. Under the condition that the size of a narrow well unit is far smaller than the wavelength of sound waves, the phase of the surface of the metasurface is changed by adjusting filling materials and gradient geometric parameters of the narrow wells, a new additional phase is given to each narrow well face, and therefore regulation and control over the sound waves are achieved. Compared with a traditional sound wave regulation and control structure, the sound wave regulation and control structure is easy to prepare, rapid and accurate. 本发明涉及一种具有二维梯度变化的棋盘声波调控超表面结构，该棋盘超表面结构是由若干个填充不同材料的窄井单元组成的，且所述窄井的深度遵循梯度变化规律排列。在窄井单元尺寸远小于声波波长的情况下，通过调整窄井的填充材料和梯度几何参数来改变超构表面的相位，赋予每个窄井面新的附加相位，从而实现对声波的调控。本发