Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.44: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Enhancement of nonlinear optical effects by plasmonic nanoantennas — •Nils Weber, Thomas Zentgraf, and Cedrik Meier — University of Paderborn, Experimental Physics & CeOPP, Warburger Str. 100, 33098 Paderborn
The light-matter interaction for nonlinear processes is known to be rather weak. Consequently, high excitation powers are required for efficient light-light-interaction. Plasmonic nanostructures are a promising approach to achieve strong near-field enhancement.
In this work, silver split rings are used as plasmonic nanoantennas for the local enhancement of the electric field in a SiO2/ZnO/SiO2-microdisc, hence increasing the nonlinear optical response. The microdiscs are realized on a SiO2-Si(111) substrate by electron beam lithography, utilizing molecular beam epitaxy (MBE)-grown ZnO-layer as an optical emitter. With diameters ranging from 7µm to 8µm, the discs show whispering gallery modes with high quality factors of up to 5000. Furthermore, the electron beam lithography enables the patterning of nanostructures with high precision on top of the microdisc, allowing the deposition of silver split rings with outer diameters of 600nm in a concentric geometry. Finite-differences time-domain (FDTD) simulations show a strong enhancement of the electric field within the gap of the split rings in the near infrared. The optimization of the fabrication process as well as different sizes and geometries of nanoantennas are studied.