supported by Research Grants Council of Hong Kong(C6013-18G,15211918,and 15205219);the National Natural Science Foundation of China(11774297);support from the National Natural Science Foundation of China(12104383);Internal Research Fund of The Hong Kong Polytechnic University(ZZLC);supported by Hong Kong Research Grants Council(12302420,12300419,and 22302718);the National Natural Science Foundation of China(11922416 and 11802256);Hong Kong Baptist University(RC-SGT2/18-19/SCI/006)。
Artificial structures provide an efficient method to generate acoustic vortices carrying orbital angular momentum(OAM) essential for applications ranging from object manipulation to acoustic communication. However, th...
Non-spreading nature of Bessel spatiotemporal wavepackets is theoretically and experimentally investigated and orders of magnitude improvement in the spatiotemporal spreading has been demonstrated.The spatiotemporal c...