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

doi:10.1088/1674-1056/23/1/017302

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.

Keywords: optical binding force nanocube dimer surface plasmon resonance

Received: 14 May 2013
Revised: 26 June 2013
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	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)

Fund: 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).

Corresponding Authors: Xiao Jun-Jun
E-mail: eiexiao@hitsz.edu.cn

Cite this article:

Zhang Xiao-Ming (张小明), Xiao Jun-Jun (肖君军), Zhang Qiang (张强) Optical binding forces between plasmonic nanocubes：A numerical study based on discrete-dipole approximation 2014 Chin. Phys. B 23 017302

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

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