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O: Fachverband Oberflächenphysik

O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization

O 50.7: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Plasmonic nanoantennas embedded in zinc oxide — •Ruth Volmert, Nils Weber, Maximilian Albert, and Cedrik Meier — Department Physik, Universität Paderborn, 33098 Paderborn

Plasmonic nanoantennas for visible and infrared radiation can strongly enhance the interaction of light with nanoscale materials due to their strong near-field enhancement. In this work we show the effective generation of second harmonic generated light in zinc oxide (ZnO) by using double-resonant gold nanoantennas embedded in ZnO. By fully embedding the nanoantennas in the ZnO, the strong increase in the electric field between the antennas, triggered by their plasmonic resonance, is utilized for the frequency conversion. In order to embed gold nanoantennas in a ZnO environment, different approaches are demonstrated and analysed. The nanoantenna structure consists of three rods with two localized surface plasmon resonances at ω and 2ω. Two long antennas lead to strong localization of light at the fundamental frequency ω within the ZnO and the third antenna, placed between the two fundamental antennas, provides an improved reemission of the second harmonic generation (SHG) at 2ω into the far field. We show that embedding gold nanoantennas in ZnO is possible by MBE overgrowth of ZnO on the nanoantennas. In addition, nonlinear optical measurements show that the embedded structures lead to a significant enhancement of the SHG compared to the emission of nanoantennas placed on the ZnO substrate. These promising results demonstrate the potential of SHG emission from embedded metallic nanostructures and paves the way for further investigation on other fabrication parameters.