Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 23.9: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Plasmonic metasurface enhanced non-linear optical effects in LiNbO3 optical waveguides — •Felicitas Walter1, Andre Hildebrandt2, Nils Weber1, Jens Förstner2, Cedric Meier1, and Thomas Zentgraf1 — 1Department of Physics, University of Paderborn, Warburgerstr. 100, D-33098, Germany — 2Department of Electrical Engineering, University of Paderborn, Warburger Str. 100, D-33098, Germany
In this project we exploring the possibilities to enhance the frequency conversion of light in LiNbO3 waveguides by utilizing plasmonic metasurfaces. In particular, we are investigating the effects of gold plasmonic nanoantennas arrays on Titanium undiffused Lithium Niobate (Ti:LiNbO3) waveguides. Two different kind of nanoanteannas were fabricated on top of the waveguides in a two-step electron-beam lithography and lift-off process. The metasurfaces are designed for a resonance wavelength of 1500 nm. As these antennas enhance the light field locally, they serve as an enhancement for nonlinear optical effects, e.g., second harmonic generation. To guaranty a phase matching as well as the coupling into the waveguide for light incident perpendicular to the surface, we tested various periodicities and arrangements of the antennas. Furthermore, an additional layer of TiO2 on top of the metasurfaces can further increase the coupling to the optical waveguide mode by lifting the mode profile more to the surface.