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Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

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2015-12-01
Yıldız, Bilge Can
Taşgın, Mehmet Emre
Abak, Musa Kurtuluş
Coskun, Sahin
Ünalan, Hüsnü Emrah
Bek, Alpan
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.