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Plasmonics

pp 1–9 | Cite as

Rotating Ag-Fe3O4-Au Nanograin by Optical Torque with a Monochromatic Light Beam

  • Xiaoqin Mao
  • Yan Li
  • Weiyan Jiao
  • Xinshun Wang
  • Benyang Wang
Article
  • 20 Downloads

Abstract

Optical torques of asymmetrical Ag–Fe3O4–Au nanograins were investigated by the method of discrete dipole approximation (DDA). The results show that surface plasmon resonance (SPR) causes the optical torques which can keep the nanograins rotating clockwise or counterclockwise. When the power density of optical radiation is I = 109 W/m2, the angular velocities of the hybrid sphere and cube heterotrimers can reach to about 104 rad/s in the ranges of 360–374 nm and 403–426 nm, which is ten times larger than that of Brownian rotation. The peak widths at half height of angular velocity curves for two kinds of grains are in the ranges of 31–47 nm and 54–70 nm, respectively. When light radiation force offers a regular driving force, such grains can serve as potential nanoscale optical wrench or microscopic mixers. In addition, the influences of Brownian rotation and photophoresis were discussed.

Keywords

Discrete dipole approximation Radiation force Surface plasmon resonance Nanostructure 

Notes

Acknowledgments

We acknowledge Prof. B. T. Draine (Princeton University) and Prof. P. J. Flatau (University of California) for making the freely available DDSCAT program.

Funding Information

This work is supported by National Natural Science Foundation of China (11304064) and Innovation Foundation of Harbin Institute of Technology (IDGA18102146).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Xiaoqin Mao
    • 1
  • Yan Li
    • 1
  • Weiyan Jiao
    • 1
  • Xinshun Wang
    • 1
  • Benyang Wang
    • 1
  1. 1.Department of Optoelectronics ScienceHarbin Institute of Technology at WeihaiWeihaiChina

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