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Title: Nonlinearity-induced nanoparticle circumgyration at sub-diffraction scale
Authors: Qin, Yaqiang
Zhou, Lei-Ming
Huang, Lu
Jin, Yunfeng
Shi, Hao
Shi, Shali
Guo, Honglian
Xiao, Liantuan
Yang, Yuanjie
Qiu, Cheng-Wei 
Jiang, Yuqiang
Issue Date: 17-Jun-2021
Publisher: Nature Research
Citation: Qin, Yaqiang, Zhou, Lei-Ming, Huang, Lu, Jin, Yunfeng, Shi, Hao, Shi, Shali, Guo, Honglian, Xiao, Liantuan, Yang, Yuanjie, Qiu, Cheng-Wei, Jiang, Yuqiang (2021-06-17). Nonlinearity-induced nanoparticle circumgyration at sub-diffraction scale. Nature Communications 12 (1) : 3722. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The ability of light beams to rotate nano-objects has important applications in optical micromachines and biotechnology. However, due to the diffraction limit, it is challenging to rotate nanoparticles at subwavelength scale. Here, we propose a method to obtain controlled fast orbital rotation (i.e., circumgyration) at deep subwavelength scale, based on the nonlinear optical effect rather than sub-diffraction focusing. We experimentally demonstrate rotation of metallic nanoparticles with orbital radius of 71 nm, to our knowledge, the smallest orbital radius obtained by optical trapping thus far. The circumgyration frequency of particles in water can be more than 1 kHz. In addition, we use a femtosecond pulsed Gaussian beam rather than vortex beams in the experiment. Our study provides paradigms for nanoparticle manipulation beyond the diffraction limit, which will not only push toward possible applications in optically driven nanomachines, but also spur more fascinating research in nano-rheology, micro-fluid mechanics and biological applications at the nanoscale. © 2021, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-24100-0
Rights: Attribution 4.0 International
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