Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

Yildiz B. C., TAŞGIN M. E., Abak M. K., COŞKUN Ş., ÜNALAN H. E., BEK A.

JOURNAL OF OPTICS, cilt.17, sa.12, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 12
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1088/2040-8978/17/12/125005
  • Dergi Adı: JOURNAL OF OPTICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Eskişehir Osmangazi Üniversitesi Adresli: Hayır

Özet

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.