用于声学伪表面波调控的编码超表面设计OA

Novel physical state manipulation based on acoustic artificial structures has become a research hotspot in recent years.Among them,spoof surface acoustic waves(SSAWs)have garnered extensive attention owing to their surface-propagating characteristic and flexible modulatability by structures,exhibiting application potential in areas including high-resolution imaging and acoustic communication.However,the modulation approaches for SSAWs have limitations.In particular,effective phase encoding of SSAWs cannot be achieved currently,making it difficult to meet the requirements of practical application scenarios.Thus,there is an urgent need to explore new pathways for efficient modulation of SSAWs.This paper proposes a multifunctional coded acoustic metasurface based on Helmholtz resonators,achieving phase encoding of SSAWs by varying the cavity depth.Specifically,this paper designs an acoustic metalens that can achieve precise and tunable subwavelength acoustic focusing in a two-dimensional plane.In addition,this study further realizes the effective excitation of Airy beams by utilizing the asymmetric phase modulation mechanism,which is expected to have certain application potential in fields such as high-resolution medical ultrasonic imaging and acoustic communications.