文章基本信息

标题：Optical pulling forces on Rayleigh particles using ambient optical nonlinearity
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作者：Liping Gong ; Xiaohe Zhang ; Bing Gu 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2019
卷号：8
期号：6
页码：1117-1124
DOI：10.1515/nanoph-2019-0095
出版社：Walter de Gruyter GmbH
摘要：Optical pulling forces exerted on small particles can be achieved by tailoring the properties of the electromagnetic field, the particles themselves, or the surrounding environment. However, the nonlinear optical effect of the surrounding environment has been largely neglected. Herein, we report the optical pulling forces on a Rayleigh particle immersed in a nonlinear optical liquid using high-repetition-rate femtosecond laser pulses. The analytic expression of time-averaged optical forces allows us to better understand the underlying mechanism of the particle transportation. It is shown that the two-photon absorption of the surrounding liquid gives rise to a negative radiation force. Transversely confined Rayleigh particles can be continuously dragged towards the light source during a pulling process..
关键词：pulling force ; laser trapping ; nonlinear optical effect ; two;photon absorption ; femtosecond laser pulses ; 78.20.Bh ; 78.67.Bf ; 87.80.Cc ; 62.65.An ; 42.65.Re