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, cilt.17, sa.12, 2015 (SCI-Expanded, Scopus)

• 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
• Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
• Hacettepe Üniversitesi Adresli: Evet

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.