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  • Received: May. 18, 2020

    Accepted: Jun. 10, 2020

    Posted: Jul. 10, 2020

    Published Online: Jul. 14, 2020

    The Author Email: Bing Gu (gubing@seu.edu.cn)

    DOI: 10.3788/COL202018.081901

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    Liping Gong, Xiaohe Zhang, Zhuqing Zhu, Guanghao Rui, Jun He, Yiping Cui, Bing Gu. Femtosecond laser trapping dynamics of two-photon absorbing hollow-core nanoparticles[J]. Chinese Optics Letters, 2020, 18(8): 081901

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Chinese Optics Letters, Vol. 18, Issue 8, 081901 (2020)

Femtosecond laser trapping dynamics of two-photon absorbing hollow-core nanoparticles

Liping Gong1, Xiaohe Zhang1, Zhuqing Zhu2, Guanghao Rui1, Jun He3, Yiping Cui1, and Bing Gu1,4,*

Author Affiliations

  • 1Advanced Photonics Center, Southeast University, Nanjing 210096, China
  • 2Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
  • 3School of Physics and Electronics, Central South University, Changsha 410012, China
  • 4Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China

Abstract

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.

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