Stable optical lateral forces from inhomogeneities of the spin angular momentum

Yuzhi Shi; Tongtong Zhu; Jingquan Liu; Din Ping Tsai; Hui Zhang; Shubo Wang; Che Ting Chan; Pin Chieh Wu; Anatoly V. Zayats; Franco Nori; Ai Qun Liu

doi:10.1126/sciadv.abn2291

Stable optical lateral forces from inhomogeneities of the spin angular momentum

Yuzhi Shi^*, Tongtong Zhu, Jingquan Liu, Din Ping Tsai^*, Hui Zhang, Shubo Wang, Che Ting Chan, Pin Chieh Wu, Anatoly V. Zayats, Franco Nori^*, Ai Qun Liu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

Transverse spin momentum related to the spin angular momentum (SAM) of light has been theoretically studied recently and predicted to generate an intriguing optical lateral force (OLF). Despite extensive studies, there is no direct experimental evidence of a stable OLF resulting from the dominant SAM rather than the ubiquitous spin-orbit interaction in a single light beam. Here, we theoretically unveil the nontrivial physics of SAM-correlated OLF, showing that the SAM is a dominant factor for the OLF on a nonabsorbing particle, while an additional force from the canonical (orbital) momentum is exhibited on an absorbing particle due to the spin-orbit interaction. Experimental results demonstrate the bidirectional movement of 5-μm-diameter particles on both sides of the beam with opposite spin momenta. The amplitude and sign of this force strongly depend on the polarization. Our optofluidic platform advances the exploitation of exotic forces in systems with a dominant SAM, facilitating the exploration of fascinating light-matter interactions.

Original language	English
Article number	eabn2291
Number of pages	10
Journal	Science Advances
Volume	8
Issue number	48
Online published	30 Nov 2022
DOIs	https://doi.org/10.1126/sciadv.abn2291
Publication status	Published - 2 Dec 2022

Funding

Y.S. was supported by the Fundamental Research Funds for the Central Universities. Y.S. and A.Q.L. acknowledge the Singapore Ministry of Education (MOE) Tier 3 grant (MOE2017-T3-1-001), Singapore National Research Foundation grant (MOH-000926), A*STAR research grant (SERC A18A5b0056), and Singapore’s National Water Agency grant (PUB-1804-0082). F.N. is supported, in part, by Nippon Telegraph and Telephone Corporation (NTT) Research, the Japan Society for the Promotion of Science (JSPS) [via the Grants-in-Aid for Scientific Research (KAKENHI), grant no. JP20H00134], the Army Research Office (ARO) (grant no. W911NF-18-1-0358), the Asian Office of Aerospace Research and Development (AOARD) (via grant no. FA2386-20-1-4069), and the Foundational Questions Institute Fund (FQXi) via grant no. FQXi-IAF19-06. D.P.T. acknowledges the support from the UGC/RGC of the HKSAR, China (project no. AoE/P-502/20 and GRF project 15303521); the Department of Science and Technology of Guangdong Province (no. 2020B1515120073); the Shenzhen Science and Technology Innovation Commission (grant no. SGDX2019081623281169); and the City University of Hong Kong (grant no. 9380131). T.Z. acknowledges the Natural Science Foundation of China (NSFC), grant no. 12104083. A.V.Z. acknowledges the support from the ERC iCOMM project (789340). P.C.W. acknowledges the support from the Ministry of Science and Technology (MOST), Taiwan (grant nos. 107-2923-M-006-004-MY3, 108-2112-M-006-021-MY3, and 110-2124-M-006-004), and, in part, from the Higher Education Sprout Project of the Ministry of Education (MOE) to the Headquarters of University Advancement at National Cheng Kung University (NCKU). P.C.W. also acknowledges the support from the Ministry of Education (Yushan Young Scholar Program), Taiwan.

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title = "Stable optical lateral forces from inhomogeneities of the spin angular momentum",

abstract = "Transverse spin momentum related to the spin angular momentum (SAM) of light has been theoretically studied recently and predicted to generate an intriguing optical lateral force (OLF). Despite extensive studies, there is no direct experimental evidence of a stable OLF resulting from the dominant SAM rather than the ubiquitous spin-orbit interaction in a single light beam. Here, we theoretically unveil the nontrivial physics of SAM-correlated OLF, showing that the SAM is a dominant factor for the OLF on a nonabsorbing particle, while an additional force from the canonical (orbital) momentum is exhibited on an absorbing particle due to the spin-orbit interaction. Experimental results demonstrate the bidirectional movement of 5-μm-diameter particles on both sides of the beam with opposite spin momenta. The amplitude and sign of this force strongly depend on the polarization. Our optofluidic platform advances the exploitation of exotic forces in systems with a dominant SAM, facilitating the exploration of fascinating light-matter interactions.",

author = "Yuzhi Shi and Tongtong Zhu and Jingquan Liu and Tsai, {Din Ping} and Hui Zhang and Shubo Wang and Chan, {Che Ting} and Wu, {Pin Chieh} and Zayats, {Anatoly V.} and Franco Nori and Liu, {Ai Qun}",

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doi = "10.1126/sciadv.abn2291",

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AU - Shi, Yuzhi

AU - Zhu, Tongtong

AU - Liu, Jingquan

AU - Tsai, Din Ping

AU - Zhang, Hui

AU - Wang, Shubo

AU - Chan, Che Ting

AU - Wu, Pin Chieh

AU - Zayats, Anatoly V.

AU - Nori, Franco

AU - Liu, Ai Qun

PY - 2022/12/2

Y1 - 2022/12/2

N2 - Transverse spin momentum related to the spin angular momentum (SAM) of light has been theoretically studied recently and predicted to generate an intriguing optical lateral force (OLF). Despite extensive studies, there is no direct experimental evidence of a stable OLF resulting from the dominant SAM rather than the ubiquitous spin-orbit interaction in a single light beam. Here, we theoretically unveil the nontrivial physics of SAM-correlated OLF, showing that the SAM is a dominant factor for the OLF on a nonabsorbing particle, while an additional force from the canonical (orbital) momentum is exhibited on an absorbing particle due to the spin-orbit interaction. Experimental results demonstrate the bidirectional movement of 5-μm-diameter particles on both sides of the beam with opposite spin momenta. The amplitude and sign of this force strongly depend on the polarization. Our optofluidic platform advances the exploitation of exotic forces in systems with a dominant SAM, facilitating the exploration of fascinating light-matter interactions.

AB - Transverse spin momentum related to the spin angular momentum (SAM) of light has been theoretically studied recently and predicted to generate an intriguing optical lateral force (OLF). Despite extensive studies, there is no direct experimental evidence of a stable OLF resulting from the dominant SAM rather than the ubiquitous spin-orbit interaction in a single light beam. Here, we theoretically unveil the nontrivial physics of SAM-correlated OLF, showing that the SAM is a dominant factor for the OLF on a nonabsorbing particle, while an additional force from the canonical (orbital) momentum is exhibited on an absorbing particle due to the spin-orbit interaction. Experimental results demonstrate the bidirectional movement of 5-μm-diameter particles on both sides of the beam with opposite spin momenta. The amplitude and sign of this force strongly depend on the polarization. Our optofluidic platform advances the exploitation of exotic forces in systems with a dominant SAM, facilitating the exploration of fascinating light-matter interactions.

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JO - Science Advances

JF - Science Advances

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Stable optical lateral forces from inhomogeneities of the spin angular momentum

Abstract

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AoE(UGC): Meta-optics, Meta-acoustics and Meta-device

GRF: Bound States in the Continuum Enhanced Second Harmonic Generation of Lithium Niobate

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Stable optical lateral forces from inhomogeneities of the spin angular momentum

Abstract

Funding

Publisher's Copyright Statement

RGC Funding Information

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Other Access Options

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Projects

AoE(UGC): Meta-optics, Meta-acoustics and Meta-device

GRF: Bound States in the Continuum Enhanced Second Harmonic Generation of Lithium Niobate

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