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

被引：6
|
作者：
Gong, Liping [1 ]
Zhang, Xiaohe [1 ]
Zhu, Zhuqing [2 ]
Rui, Guanghao [1 ]
He, Jun [3 ]
Cui, Yiping [1 ]
Gu, Bing [1 ,4 ]
机构：
[1] Southeast Univ, Adv Photon Ctr, Nanjing 210096, Peoples R China
[2] Nanjing Normal Univ, Sch Phys Sci & Technol, Key Lab Optoelect Technol Jiangsu Prov, Nanjing 210023, Peoples R China
[3] Cent South Univ, Sch Phys & Elect, Changsha 410012, Peoples R China
[4] Shandong Normal Univ, Collaborat Innovat Ctr Light Manipulat & Applicat, Jinan 250358, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2020年 / 18卷 / 08期
基金：
中国国家自然科学基金;
关键词：
laser trapping; multiphoton processes; ultrafast nonlinear optics; QUANTUM DOTS; PARTICLES; SPHERES; FORCES; NONLINEARITIES; MICROPARTICLES; SHELL; WAVE; CDTE;
D O I：
10.3788/COL202018.081901
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
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.
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收藏
页数：6
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