Details
| Original language | English |
|---|---|
| Article number | 2100888 |
| Journal | Advanced science |
| Volume | 8 |
| Issue number | 15 |
| Early online date | 9 Jun 2021 |
| Publication status | Published - 4 Aug 2021 |
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.
Keywords
- contact-free manipulation, dynamic levitation, ferrofluid, subwavelength, ultrasound
ASJC Scopus subject areas
- Medicine(all)
- Medicine (miscellaneous)
- Chemical Engineering(all)
- Materials Science(all)
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- Engineering(all)
- Physics and Astronomy(all)
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In: Advanced science, Vol. 8, No. 15, 2100888, 04.08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dynamic Acoustic Levitator Based On Subwavelength Aperture Control
AU - Lu, Xiaolong
AU - Twiefel, Jens
AU - Ma, Zhichao
AU - Yu, Tingting
AU - Wallaschek, Jörg
AU - Fischer, Peer
N1 - Funding Information: The authors thank Kai Melde, Tian Qiu, Athanasios G. Athanassiadis, and Vincent Mauricio Kadiri for helpful discussions. They also thank Valentin Volchkov for helpful suggestions and for the ferrofluid sample. This research was in part supported by the European Research Council under the ERC Advanced Grant Agreement HOLOMAN (No. 788296) and by the Max Planck Society. X.L. acknowledges financial support from the Alexander von Humboldt Foundation and the National Natural Science Foundation of China (Grant No. 51975278).
PY - 2021/8/4
Y1 - 2021/8/4
N2 - 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.
AB - 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.
KW - contact-free manipulation
KW - dynamic levitation
KW - ferrofluid
KW - subwavelength
KW - ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85107335929&partnerID=8YFLogxK
U2 - 10.1002/advs.202100888
DO - 10.1002/advs.202100888
M3 - Article
C2 - 34105900
AN - SCOPUS:85107335929
VL - 8
JO - Advanced science
JF - Advanced science
SN - 2198-3844
IS - 15
M1 - 2100888
ER -