ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Numerical study of optical trapping properties of nanoparticle on metallic film with periodic structure |
Cheng-Xian Ge(葛城显)1, Zhen-Sen Wu(吴振森)1, Jing Bai(白靖)1, Lei Gong(巩蕾)2 |
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China; 2 School of Photoelectric Engineering, Xi'an Technological University, Xi'an 710021, China |
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Abstract Based on the three-dimensional dispersive finite difference time domain method and Maxwell stress tensor equation, the optical trapping properties of nanoparticle placed on the gold film with periodic circular holes are investigated numerically. Surface plasmon polaritons are excited on the metal-dielectric interface, with particular emphasis on the crucial role in tailoring the optical force acting on a nearby nanoparticle. Utilizing a first order corrected electromagnetic field components for a fundamental Gaussian beam, the incident beam is added into the calculation model of the proposed method. To obtain the detailed trapping properties of nanoparticle, the selected calculations on the effects of beam waist radius, sizes of nanoparticle and circular holes, distance between incident Gaussian beam and gold film, material of nanoparticle and polarization angles of incident wave are analyzed in detail to demonstrate that the optical-trapping force can be explained as a virtual spring which has a restoring force to perform positive and negative forces as a nanoparticle moves closer to or away from the centers of circular holes. The results of optical trapping properties of nanoparticle in the vicinity of the gold film could provide guidelines for further research on the optical system design and manipulation of arbitrary composite nanoparticles.
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Received: 02 August 2018
Revised: 09 October 2018
Accepted manuscript online:
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PACS:
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42.25.Fx
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(Diffraction and scattering)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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02.70.Bf
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(Finite-difference methods)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61701382, 61601355, and 61571355), the China Postdoctoral Science Foundation (Grant No. 2016M602770), and the Xi'an Technological University Principal Foundation Key Project, China (Grant No. XAGDXJJ18001). |
Corresponding Authors:
Zhen-Sen Wu
E-mail: wuzhs@mail.xidian.edu.cn
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Cite this article:
Cheng-Xian Ge(葛城显), Zhen-Sen Wu(吴振森), Jing Bai(白靖), Lei Gong(巩蕾) Numerical study of optical trapping properties of nanoparticle on metallic film with periodic structure 2019 Chin. Phys. B 28 024203
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