摘要
We investigate femtosecond laser trapping dynamics of two-photon absorbing hollow-core nanoparticles with different volume fractions and two-photon absorption(TPA)coefficients.Numerical simulations show that the hollow-core particles with low and high-volume fractions can easily be trapped and bounced by the tightly focused Gaussian laser pulses,respectively.Further studies show that the hollow-core particles with and without TPA can be identified,because the TPA effect enhances the radiation force,and subsequently the longitudinal force destabilizes the trap by pushing the particle away from the focal point.The results may find direct applications in particle sorting and characterizing the TPA coefficient of single nanoparticles.
作者
贡丽萍
张笑河
朱竹青
芮光浩
何军
崔一平
顾兵
Liping Gong;Xiaohe Zhang;Zhuqing Zhu;Guanghao Rui;Jun He;Yiping Cui;Bing Gu(Advanced Photonics Center,Southeast University,Nanjing 210096,China;Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China;School of Physics and Electronics,Central South University,Changsha 410012,China;Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China)
基金
financially supported by the National Natural Science Foundation of China(No.11774055)
the Natural Science Foundation of Jiangsu Province(No.BK20171364)。
