Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

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Yildiz B. C., TAŞGIN M. E., Abak M. K., Coskun S., ÜNALAN H. E., BEK A.

JOURNAL OF OPTICS, vol.17, no.12, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 17 Issue: 12
  • Publication Date: 2015
  • Doi Number: 10.1088/2040-8978/17/12/125005
  • Journal Name: JOURNAL OF OPTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Hacettepe University Affiliated: Yes

Abstract

We experimentally demonstrate that two coupled metal nanostructures (MNSs), a silver nanowire and bipyramid, can produce similar to 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.