中国物理B ›› 2019, Vol. 28 ›› Issue (2): 24203-024203.doi: 10.1088/1674-1056/28/2/024203

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Numerical study of optical trapping properties of nanoparticle on metallic film with periodic structure

Cheng-Xian Ge(葛城显), Zhen-Sen Wu(吴振森), Jing Bai(白靖), Lei Gong(巩蕾)   

  1. 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
  • 收稿日期:2018-08-02 修回日期:2018-10-09 出版日期:2019-02-05 发布日期:2019-02-05
  • 通讯作者: Zhen-Sen Wu E-mail:wuzhs@mail.xidian.edu.cn
  • 基金资助:
    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).

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. 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
  • Received:2018-08-02 Revised:2018-10-09 Online:2019-02-05 Published:2019-02-05
  • Contact: Zhen-Sen Wu E-mail:wuzhs@mail.xidian.edu.cn
  • Supported by:
    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).

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摘要： 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.

关键词: surface plasmon, periodic circular holes, optical trapping force, Maxwell stress tensor, gold film

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.

Key words: surface plasmon, periodic circular holes, optical trapping force, Maxwell stress tensor, gold film

中图分类号:  (Diffraction and scattering)

  • 42.25.Fx
42.25.Bs (Wave propagation, transmission and absorption) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 02.70.Bf (Finite-difference methods)