Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

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Yıldız B. C., Taşgın M. E., Abak M. K., Coskun S., Ünalan H. E., Bek A.

JOURNAL OF OPTICS, vol.17, 2015 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 17
  • 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
  • Keywords: Fano resonance, second harmonic generation, plasmons, nonlinear optics, enhancement, INDUCED TRANSPARENCY, FANO RESONANCES, NANOPARTICLES, METAMATERIALS, SYSTEMS, FUTURE, SILVER
  • Open Archive Collection: AVESIS Open Access Collection
  • Middle East Technical 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.