Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures


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

JOURNAL OF OPTICS, vol.17, no.12, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 17 Issue: 12
  • Publication Date: 2015
  • Doi Number: 10.1088/2040-8978/17/12/125005
  • Title of Journal : JOURNAL OF OPTICS

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.