Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

  title={Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures},
  author={Bilge Can Yildiz and Mehmet Emre Tasgin and Musa Kurtuluş Abak and Şahin Coşkun and Husnu Emrah Unalan and Alpan Bek},
  journal={Journal of Optics},
We experimentally demonstrate that two coupled metal nanostructures (MNSs), a silver nanowire and bipyramid, can produce ∼30 times enhanced second harmonic generation compared to the particles alone. We develop a simple theoretical model, presenting the path interference effects in the nonlinear response of coupled MNSs. We show that the reason for such an enhancement can be the occurrence of a Fano resonance due to the coupling of the converter MNS to the long-lived mode of the attached MNS. 

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