This chapter establishes the prototype of acoustic metasurface piezoelectric transducer (PT), whose piezoelectric elements are squeezed into a flat thin layer compared to the scale of the entire device. The active planar interface also extends the knowledge of acoustic metasurface engineering for the deflection of sound beams using passive elements (Li et al., Sci Rep 3:2546, 2013, , Zhao, Appl Phys Lett 103(15):151604, 2013, ). Through the optimized ring configurations of the active metasurface PT, we are able to manipulate the focal pattern and the focal resolution in acoustic far fields. Firstly, we design the far-field finite-length focal needle with the manipulated distance and depth. Its focal resolution is subwavelength for the full width at half maximum (FWHM), and it propagates without divergence for a distance of 5.9\(\lambda \) as designed, longer than the depth 4\(\lambda \) of the reported optical needle (Wang, Nat. Photonics 2(8):501–505, 2008, ). These two designed focusing properties created with PTs were never achieved in acoustics, to the best of our knowledge. To further verify the robustness of our manipulation of the focal pattern, via another optimized ring configuration, we obtain the designed far-field multiple foci, whose FWHM (0.45\(\lambda \)) beats the Rayleigh diffraction limit of conventional acoustic instruments (0.5\(\lambda \)). Besides, to demonstrate the manipulation of the focal resolution, we design the extreme case of the super-oscillatory super resolution, whose size is 0.3\(\lambda \) in acoustic far fields, much smaller than the diffraction limit.
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