Active Acoustic Metasurface: Complete Elimination of Grating Lobes for High-Quality Ultrasound Focusing and Controllable Steering
Physical Review Applied2019Vol. 11(3)
Citations Over TimeTop 15% of 2019 papers
Ya‐Xi Shen, Xue‐Feng Zhu, Feiyan Cai, Teng Ma, Fei Li, Xiangxiang Xia, Yongchuan Li, Congzhi Wang, Hairong Zheng
Abstract
Focused ultrasound is important in clinical medical applications, to destroy tumor cells or treat a variety of neurological diseases, for example. The focused ultrasound field projected by a transducer array includes traditionally unavoidable side lobes, however, which may cause harmful heating in nontargeted regions. This work implements an active acoustic metasurface, comprising 16\ifmmode\times\else\texttimes\fi{}16 elements of subwavelength thickness, which can completely eliminate such side lobes. Experiments convincingly demonstrate that this active metasurface with programmable phase and amplitude distributions offers high performance in side-lobe-proof, steerable ultrasound focusing.
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