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For steady and free\u2010flowing particle management, it is essential to produce acoustic OAM beams of high order and high quality. However, this task is difficult due to the phased array's fundamental restriction of insufficient resolution or aperture. Herein, a generic approach is presented to inverse design that may be used to improve the OAM beam quality and produce twisted ultrasonic motors in free space. In comparison to the previous direct\u2010design method, up to a 14% improvement in amplitude uniformity and a 12\u2009dB improvement in signal\u2010to\u2010noise ratio (SNR) of OAM modes are achieved. These notable benefits enable the ultrasonic motor to operate with a straightforward and compact system while enabling steady particle rotation in free space with an undersampled phased array, which is not possible with the conventional technique. This study paves the way for effective particle control, high\u2010fidelity communication, and other OAM\u2010based technologies by providing an inverse\u2010design framework for optimizing OAM.<\/jats:p>","DOI":"10.1002\/aisy.202300255","type":"journal-article","created":{"date-parts":[[2023,8,27]],"date-time":"2023-08-27T22:52:22Z","timestamp":1693176742000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Inverse\u2010Design Methodology for Generating Twisted Ultrasonic Motor in Free Space"],"prefix":"10.1002","volume":"5","author":[{"given":"Chuanxin","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for Biomedical Engineering School of Information Science and Technology Fudan University  Shanghai 200433 China"}]},{"given":"Jiajie","family":"He","sequence":"additional","affiliation":[{"name":"Center for Biomedical Engineering School of Information Science and Technology Fudan University  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