Chin. Phys. B ›› 2014, Vol. 23 ›› Issue (1): 17302-017302.doi: 10.1088/1674-1056/23/1/017302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Optical binding forces between plasmonic nanocubes：A numerical study based on discrete-dipole approximation

张小明, 肖君军, 张强   

  1. College of Electronic and Information Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
  • 收稿日期:2013-05-14 修回日期:2013-06-26 出版日期:2013-11-12 发布日期:2013-11-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11004043, 11274083, and 61107036) and the SZMSTP, China (Grant Nos. JC201005260185A, JCYJ20120613114137248, 2011PTZZ048, JC201105160524A, and KQCX20120801093710373).

Optical binding forces between plasmonic nanocubes：A numerical study based on discrete-dipole approximation

Zhang Xiao-Ming (张小明), Xiao Jun-Jun (肖君军), Zhang Qiang (张强)   

  1. College of Electronic and Information Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
  • Received:2013-05-14 Revised:2013-06-26 Online:2013-11-12 Published:2013-11-12
  • Contact: Xiao Jun-Jun E-mail:eiexiao@hitsz.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11004043, 11274083, and 61107036) and the SZMSTP, China (Grant Nos. JC201005260185A, JCYJ20120613114137248, 2011PTZZ048, JC201105160524A, and KQCX20120801093710373).

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摘要： Plasmonic nanocubes are ideal candidates in realizing controllable reflectance surfaces, unidirectional nanoantennas and other plasmon-associated applications. In this work, we perform full-wave calculations of the optical forces in three-dimensional gold nanocube dimers. For a fixed center-to-center separation, the rotation of the plasmonic nanocube leads to a slight shift of the plasmonic resonance wavelength and a strong change in the optical binding forces. The effective gap and the near field distribution between the two nanocubes are shown to be crucial to this force variation. We further find that the optical binding force is dominated by the scattering process while the optical forces in the wavevector direction are affected by both scattering and absorption, making the former relatively more sensitive to the rotation of (an effective gap between) the nanocubes. Our results would be useful for building all-optically controllable meta-surfaces.

关键词: optical binding force, nanocube dimer, surface plasmon resonance

Abstract: Plasmonic nanocubes are ideal candidates in realizing controllable reflectance surfaces, unidirectional nanoantennas and other plasmon-associated applications. In this work, we perform full-wave calculations of the optical forces in three-dimensional gold nanocube dimers. For a fixed center-to-center separation, the rotation of the plasmonic nanocube leads to a slight shift of the plasmonic resonance wavelength and a strong change in the optical binding forces. The effective gap and the near field distribution between the two nanocubes are shown to be crucial to this force variation. We further find that the optical binding force is dominated by the scattering process while the optical forces in the wavevector direction are affected by both scattering and absorption, making the former relatively more sensitive to the rotation of (an effective gap between) the nanocubes. Our results would be useful for building all-optically controllable meta-surfaces.

Key words: optical binding force, nanocube dimer, surface plasmon resonance

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 42.50.Wk (Mechanical effects of light on material media, microstructures and particles) 78.68.+m (Optical properties of surfaces)