Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

Yildiz, Bilge; TAŞGIN, MEHMET; Abak, Musa; COŞKUN, ŞAHİN; ÜNALAN, HÜSNÜ; BEK, ALPAN

doi:10.1088/2040-8978/17/12/125005

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, vol.17, no.12, 2015 (SCI-Expanded, Scopus)

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
Eskisehir Osmangazi University Affiliated: No

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.