Enhanced second harmonic generation from coupled asymmetric plasmonic metal nanostructures

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Yıldız B. C. , Taşgın M. E. , Abak M. K. , Coskun S. , Ünalan H. E. , Bek A.

JOURNAL OF OPTICS, cilt.17, 2015 (SCI İndekslerine Giren Dergi) identifier identifier


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.