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Light-driven self-assembly of hetero-shaped gold nanorods

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Abstract

Light-driven self-assembly and coalescence of two nearby hetero-shaped gold nanorods (GNRs) with different lengths are studied theoretically. The optical forces and torques, in terms of Maxwell’s stress tensor, upon these GNRs provided by a linearly polarized (LP) plane wave are analyzed using the multiple multipole (MMP) method. Numerical results show that the optical torque dominates their alignments and the optical force their attraction. The most likely outcome of the plasmon-mediated light–matter interaction is wavelength dependent. Three different coalescences of the two GNRs could be induced by a LP light in three different wavelength regimes, respectively. For example, the side-by-side coalescence of two GNRs with radius of 15 nm and different lengths (120 and 240 nm) is induced in water as irradiated by a LP light at 633 nm, the T-shaped one at 1064 nm, and the end-to-end one at 1700 nm. The plasmonic attractive force and heating power densities inside GNRs with different gaps are also studied; the smaller the gap, the larger the attractive force and heating power. The results imply that the plasmonic coalescence and heating of two discrete GNRs may cause the local fusion at the junction of the assembly and the subsequent annealing (even recrystallization). Because the heating makes the two discrete GNRs fused to become a new nanostructure, the plasmonic coalescence of optical manipulation is irreversible.

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Acknowledgements

The research was supported by Ministry of Science and Technology, Taiwan (MOST 103-2221-E-182-033-MY2, 103-2112-M-019-003-MY3, 104-2221-E-182-053, 105-2221-E-182-031, 105-2221-E-002-079) and Chang Gung Memorial Hospital (CIRPD2E0032).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chang Gung University, Taoyuan, Taiwan

    Jiunn-Woei Liaw

  2. Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Taoyuan, Taiwan

    Jiunn-Woei Liaw

  3. Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital, Linkou, Taiwan

    Jiunn-Woei Liaw

  4. Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei, Taiwan

    Jiunn-Woei Liaw

  5. Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan

    Hsueh-Yu Chao, Cheng-Wei Huang & Mao-Kuen Kuo

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  1. Jiunn-Woei Liaw
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  2. Hsueh-Yu Chao
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  3. Cheng-Wei Huang
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  4. Mao-Kuen Kuo
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Correspondence to Jiunn-Woei Liaw or Mao-Kuen Kuo.

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Liaw, JW., Chao, HY., Huang, CW. et al. Light-driven self-assembly of hetero-shaped gold nanorods. Appl. Phys. A 124, 16 (2018). https://doi.org/10.1007/s00339-017-1432-1

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