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Asymmetric growth of Au-core/Ag-shell nanorods with a strong octupolar plasmon resonance and an efficient second-harmonic generation

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Abstract

Colloidal Au-core/Ag-shell nanorods with an asymmetric transverse cross-section and a strong octupolar plasmon resonance are synthesized by the controlled growth of Ag shells on one side of the Au cores. A largely enhanced second harmonic generation (SHG) from these asymmetric core–shell nanorods is demonstrated for the first time by tuning the dipolar and the octupolar plasmon modes to make them resonant with the fundamental and harmonic frequencies, respectively. The SHG intensity of the Au–Ag nanorods with dual-frequency resonances is enhanced by 21 times compared to that of the bare Au nanorods. The co-existence of the dipolar, quadrupolar, and octupolar radiations in the SHG is revealed. Additionally, the cellular uptake of the Au–Ag nanorods is monitored and the evolution of the membrane bleb is successfully observed by the SHG imaging. Our observations provide a strategy for enhancing the SHG of the colloidal metal nanoparticles and can have applications in chemical process monitoring and biological sensing.

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Acknowledgements

We thank Jiahong Wang for assistance in sample preparations and helpful discussion. This work was supported by the National Basic Research Program of China (No. 2013CB632805), the National Natural Science Foundation of China (Nos. 11174042, 11374039, and 11604180), and China Postdoctoral Science Foundation (No. 2016M602338).

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Correspondence to Jianfang Wang or Ququan Wang.

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Ding, S., Yang, D., Liu, X. et al. Asymmetric growth of Au-core/Ag-shell nanorods with a strong octupolar plasmon resonance and an efficient second-harmonic generation. Nano Res. 11, 686–695 (2018). https://doi.org/10.1007/s12274-017-1678-0

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Keywords

  • gold-core/silver-shell nanorods
  • asymmetric growth
  • octupole surface plasmon resonance
  • second-harmonic generation