Optical forces of focused femtosecond laser pulses on nonlinear optical Rayleigh particles
The principle of optical trapping is conventionally based on the interaction of optical fields with linear-induced polarizations. However, the optical force originating from the nonlinear polarization becomes significant when nonlinear optical nanoparticles are trapped by femtosecond laser pulses. Herein we develop the time-averaged optical forces on a nonlinear optical nanoparticle using high-repetition-rate femtosecond laser pulses, based on the linear and nonlinear polarization effects. We investigate the dependence of the optical forces on the magnitudes and signs of the refractive nonlinearities. It is found that the self-focusing effect enhances the trapping ability, whereas the self-defocusing effect leads to the splitting of the potential well at the focal plane and destabilizes the optical trap. Our results show good agreement with the reported experimental observations and provide theoretical support for capturing nonlinear optical particles.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (11474052, 11504049, 11774055, 61535003); Natural Science Foundation of Jiangsu Province10.13039/501100004608, China (BK20171364); National Key Basic Research Program of China (2015CB352002).
Bing Gu：Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, China
Guanghao Rui：Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, China
Yiping Cui：Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, China
Zhuqing Zhu：Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, Jiangsu, China
Qiwen Zhan：Department of Electro-Optics and Photonics, University of Dayton, 300 College Park, Dayton, Ohio 45469-2951, USA
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Liping Gong, Bing Gu, Guanghao Rui, Yiping Cui, Zhuqing Zhu, and Qiwen Zhan, "Optical forces of focused femtosecond laser pulses on nonlinear optical Rayleigh particles," Photonics Research 6(2), 138-143 (2018)