Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Optical and nonlinear optical properties, photonic

DF 11.3: Vortrag

Mittwoch, 28. März 2012, 10:10–10:30, EB 107

Surface plasmon resonance of Ag nanoclusters and refractive index changes in ion irradiated lithium niobate — •Jura Rensberg, Steffen Milz, Carsten Ronning, and Werner Wesch — Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany

Lithium niobate (LiNbO₃) is one of the most important materials for integrated optics, because of its unique electro-optical and nonlinear optical properties. Ion beam synthesis plays a key role in fabricating arrays of metal nanoclusters embedded in LiNbO₃ particularly with regard to plasmonic applications. Major challenges of this technique are on the one hand to control the cluster size distribution and on the other hand to avoid irradiation damage of the LiNbO₃. Therefore we have implanted 380 keV Ag⁺ ions up ton an ion fluence of 1x10¹⁷ cm⁻² into LiNbO₃ at room temperature. As a consequence Ag clusters nucleated and a broad amorphous layer was produced. Isochronal rapid thermal annealing as well as isothermal annealing were performed in the temperature range of 573 K to 1173 K, which leads to refractive index changes associated with lattice structure recovery.

In this contribution we shall report on polarization dependent optical spectroscopy of the surface plasmon resonance of silver nanoclusters embedded in LiNbO₃ combined with Mie theory simulations to investigate the refractive index changes upon ion irradiation and annealing.