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  Dynamic acoustic levitator based on subwavelength aperture control

Lu, X., Twiefel, J., Ma, Z., Yu, T., Wallaschek, J., & Fischer, P. (2021). Dynamic acoustic levitator based on subwavelength aperture control. Advanced Science, 8(15): 2100888, pp. 1-8. doi:10.1002/advs.202100888.

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Creators

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 Creators:
Lu, Xiaolong, Author
Twiefel, Jens, Author
Ma, Zhichao, Author
Yu, Tingting, Author
Wallaschek, Jörg, Author
Fischer, Peer1, Author                 
Affiliations:
1Max Planck Institute for Medical Research, Max Planck Society, ou_1125545              

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Free keywords: contact-free manipulation, dynamic levitation, ferrofluid, subwavelength, ultrasound
 Abstract: Acoustic levitation provides a means to achieve contactless manipulation of fragile materials and biological samples. Most acoustic levitators rely on complex electronic hardware and software to shape the acoustic field and realize their dynamic operation. Here, the authors introduce a dynamic acoustic levitator that is based on mechanically controlling the opening and (partial) closing of subwavelength apertures. This simple approach relies on the use of a single ultrasonic transducer and is shown to permit the facile and reliable manipulation of a variety targets ranging from solid particles, to fluid and ferrofluidic drops. Experimental observations agree well with numerical simulations of the Gor'kov potential. Remarkably, this system even enables the generation of time-varying potentials and induces oscillatory and rotational motion in the levitated objects via a feedback mechanism between the trapped object and the trapping potential. This is shown to result in long distance translation, in-situ rotation and self-modulated oscillation of the trapped particles. In addition, dense ferrofluidic droplets are levitated and transformed inside the levitator. Controlling subwavelength apertures opens the possibility to realize simple powerful levitators that nevertheless allow for the versatile dynamic manipulation of levitated matter.

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Language(s): eng - English
 Dates: 2021-04-082021-03-042021-06-092021-08-04
 Publication Status: Issued
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/advs.202100888
BibTex Citekey: 2021Lu
 Degree: -

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Title: Advanced Science
  Other : Adv. Sci.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 8 (15) Sequence Number: 2100888 Start / End Page: 1 - 8 Identifier: ISSN: 2198-3844
CoNE: https://pure.mpg.de/cone/journals/resource/2198-3844