Observation of acoustic spin.
acoustic spin
spin-induced torque
spin–momentum locking
Journal
National science review
ISSN: 2053-714X
Titre abrégé: Natl Sci Rev
Pays: China
ID NLM: 101633095
Informations de publication
Date de publication:
Jul 2019
Jul 2019
Historique:
received:
26
02
2019
revised:
01
04
2019
accepted:
09
05
2019
entrez:
25
10
2021
pubmed:
1
7
2019
medline:
1
7
2019
Statut:
ppublish
Résumé
Unlike optical waves, acoustic waves in fluids are described by scalar pressure fields, and therefore are considered spinless. Here, we demonstrate experimentally the existence of spin in acoustics. In the interference of two acoustic waves propagating perpendicularly to each other, we observed the spin angular momentum in free space as a result of the rotation of local particle velocity. We successfully measured the acoustic spin, and spin-induced torque acting on a designed lossy acoustic probe that results from absorption of the spin angular momentum. The acoustic spin is also observed in the evanescent field of a guided mode traveling along a metamaterial waveguide. We found spin-momentum locking in acoustic waves whose propagation direction is determined by the sign of spin. The observed acoustic spin could open a new door in acoustics and its applications for the control of wave propagation and particle rotation.
Identifiants
pubmed: 34691925
doi: 10.1093/nsr/nwz059
pii: nwz059
pmc: PMC8291453
doi:
Types de publication
Journal Article
Langues
eng
Pagination
707-712Informations de copyright
© The Author(s) 2019. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.
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