Reversible vertical positioning of acoustically levitated particle using a spiral reflector
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arXiv
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| Format: | Preprint |
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2026
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| author | Koroyasu, Yusuke Hoshi, Takayuki Nagatani, Yoshiki Tagami, Daichi Ochiai, Yoichi Fushimi, Tatsuki |
| author_facet | Koroyasu, Yusuke Hoshi, Takayuki Nagatani, Yoshiki Tagami, Daichi Ochiai, Yoichi Fushimi, Tatsuki |
| contents | Dynamic positioning in acoustic levitation typically depends on active control of the transducers phases, which necessitates complex driving electronics. While mechanically actuated reflectors offer a simpler alternative, achieving reversible transport along the vertical axis solely through mechanical actuation remains challenging. Here, we demonstrate vertical particle translation using a rotating spiral reflector with a half-wavelength pitch. With the rotation axis laterally offset relative to the acoustic focus, the spiral surface functions as a series of translating slopes. Experimental and numerical results confirm stable, bidirectional transport, yielding a vertical displacement of approximately $0.58λ$ per revolution and a maximum height of $3.18λ$, with radial confinement maintained within $0.24λ$. This approach provides a cost-effective solution for non-contact sample handling without active phase control. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_04595 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Reversible vertical positioning of acoustically levitated particle using a spiral reflector Koroyasu, Yusuke Hoshi, Takayuki Nagatani, Yoshiki Tagami, Daichi Ochiai, Yoichi Fushimi, Tatsuki Applied Physics Dynamic positioning in acoustic levitation typically depends on active control of the transducers phases, which necessitates complex driving electronics. While mechanically actuated reflectors offer a simpler alternative, achieving reversible transport along the vertical axis solely through mechanical actuation remains challenging. Here, we demonstrate vertical particle translation using a rotating spiral reflector with a half-wavelength pitch. With the rotation axis laterally offset relative to the acoustic focus, the spiral surface functions as a series of translating slopes. Experimental and numerical results confirm stable, bidirectional transport, yielding a vertical displacement of approximately $0.58λ$ per revolution and a maximum height of $3.18λ$, with radial confinement maintained within $0.24λ$. This approach provides a cost-effective solution for non-contact sample handling without active phase control. |
| title | Reversible vertical positioning of acoustically levitated particle using a spiral reflector |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2601.04595 |