Optical pulling force on nonlinear nanoparticles with gain
Hongli Chen,
Lei Gao,
Chonggui Zhong,
Guoqiu Yuan,
Yanyan Huang,
Zhongwei Yu,
Min Cao,
Meng Wang
Affiliations
Hongli Chen
School of Science, Nantong University, Nantong 226019, China
Lei Gao
School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Chonggui Zhong
School of Science, Nantong University, Nantong 226019, China
Guoqiu Yuan
School of Science, Nantong University, Nantong 226019, China
Yanyan Huang
School of Science, Nantong University, Nantong 226019, China
Zhongwei Yu
School of Science, Nantong University, Nantong 226019, China
Min Cao
School of Science, Nantong University, Nantong 226019, China
Meng Wang
School of Science, Nantong University, Nantong 226019, China
We investigate the optical force on the nonlinear nanoparticles with gain based on nonlinear Mie theory and Maxwell’s stress tensor method. For the nonlinear susceptibility χ(3) = 0 (i.e., the linear nanoparticle), the threshold gain to obtain the optical pulling force increases when the permittivity of the surrounding medium εm deviates from the real part of the permittivity of the nanoparticles εcr. For χ(3) > 0, one or two threshold fields exist for the switch of optical pulling and pushing force. However, for χ(3) < 0, only one threshold field is found. Moreover, the optical pulling force may be enhanced by tuning the incident field intensity. Our results for the optical force on the nonlinear nanoparticle will have potential applications in nonlinear optical manipulations and optical transportation.
