title: The near-field acoustic levitation of high-mass rotors.
abstract: Here we demonstrate that spherical rotors with 40 mm diameter and 0-1 kg mass can be suspended more than tens of micrometers away from an ultrasonically vibrating concave surface by near-field acoustic radiation force. Their rotating speeds exceed 3000 rpm. An acoustic model has been developed to evaluate the near-field acoustic radiation force and the resonant frequencies of levitation system. This technique has potential application in developing acoustic gyroscope.
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Hong
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: P
authors.initials: P
authors.lastname: Lü
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: D L
authors.initials: DL
authors.lastname: Geng
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: W
authors.initials: W
authors.lastname: Zhai
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: N
authors.initials: N
authors.lastname: Yan
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: B
authors.initials: B
authors.lastname: Wei