Multifunctional acoustic holography based on compact acoustic geometric-phase meta-array
Abstract
Optical geometric-phase metasurface provides a robust and efficient means for light control by simply manipulating the spatial orientations of the in-plane anisotropic meta-atoms, where polarization conversion plays a vital role. However, the concept of acoustic geometric-phase modulation for acoustic field control remains unexplored because airborne acoustic waves lack a similar optical polarization conversion process. In this work, a new type of acoustic meta-atom with deep subwavelength feature size is theoretically investigated and further applied to acoustic field engineering based on the so-called acoustic geometric phase. Herein, tunable acoustic geometric-phase modulation of designated order is obtained via the near-field coupled orbital angular momentum transfer process, and the topological charge-multiplexed acoustic geometric phase endows our meta-arrays with multiple functionalities. Our work extends the capacity of acoustic meta-arrays in high-quality acoustic field reconstruction and offers new possibilities in multifunctional acoustic meta-holograms.
Keywords
Cite
@article{arxiv.2203.02313,
title = {Multifunctional acoustic holography based on compact acoustic geometric-phase meta-array},
author = {Bingyi Liu and Qunshuo Wei and Zhaoxian Su and Yongtian Wang and Lingling Huang},
journal= {arXiv preprint arXiv:2203.02313},
year = {2022}
}