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Title: Inverse optical torques on dielectric nanoparticles in elliptically polarized light waves
Authors: Shi, Yuzhi
Zhu, Tongtong
Liu, Ai Qun
Zhou, Lei-Ming
Nieto-Vesperinas, Manuel
Hassanfiroozi, Amir
Liu, Jingquan
Tsai, Din Ping
Li, Zhenyu
Ding, Weiqiang
Wang, Fan
Li, Hang
Song, Qinghua
Xu, Xiaohao
Li, Baojun
Cheng, Xinbin
Wu, Pin Chieh
Chan, Che Ting
Qiu, Cheng-Wei
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Shi, Y., Zhu, T., Liu, A. Q., Zhou, L., Nieto-Vesperinas, M., Hassanfiroozi, A., Liu, J., Tsai, D. P., Li, Z., Ding, W., Wang, F., Li, H., Song, Q., Xu, X., Li, B., Cheng, X., Wu, P. C., Chan, C. T. & Qiu, C. (2022). Inverse optical torques on dielectric nanoparticles in elliptically polarized light waves. Physical Review Letters, 129(5), 053902-.
Project: MOE2017-T3-1-001
SERC A18A5b0056
Journal: Physical Review Letters 
Abstract: Elliptically polarized light waves carry the spin angular momentum (SAM), so they can exert optical torques on nanoparticles. Usually, the rotation follows the same direction as the SAM due to momentum conservation. It is counterintuitive to observe the reversal of optical torque acting on an ordinary dielectric nanoparticle illuminated by an elliptically or circularly polarized light wave. Here, we demonstrate that negative optical torques, which are opposite to the direction of SAM, can ubiquitously emerge when elliptically polarized light waves are impinged on dielectric nanoparticles obliquely. Intriguingly, the rotation can be switched between clockwise and counterclockwise directions by controlling the incident angle of light. Our study suggests a new playground to harness polarization-dependent optical force and torque for advancing optical manipulations.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.129.053902
Schools: School of Electrical and Electronic Engineering 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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