Dresden 2009 – scientific programme

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DS: Fachverband Dünne Schichten

DS 26: Poster II

DS 26.20: Poster

Wednesday, March 25, 2009, 09:30–12:30, P5

Gold Nano-Dot Matrices for Light-Coupling into Wave-Guided Modes of Thin Membranes — •Susanne Perlt, Marisa Mäder, Thomas Höche, and Bernd Rauschenbach — Leibniz Institute of Surface Modification, Permoserstrasse 15, D-04318 Leipzig, Germany

Well-ordered gold dot arrays on membranes possess surface plasmons capable of interacting with optical waveguides underneath [1].

Such matrices can be obtained by Diffraction Mask Projection Laser Ablation (DiMPLA) [2]. A thin metal film is illuminated by a laser pulse (Excimer laser, 248 nm (KrF) and 193 nm (ArF), 25 ns and 10 ns, respectively) with a laterally modulated intensity distribution. The pattern is created by phase-mask projection interference and gets demagnified by passing through a Schwarzschild reflective objective. Parts of the thin film are ablated whereas the remaining material forms dot structures of minimized surface energy within the heat sinks.

The correlation between film thickness, dot size, and laser fluence, respectively, is studied here. Furthermore, the dependency between structure size of the phase mask and parameters of the ablated film (like dot size and distance of the dots) are discussed. This investigation is an important precondition to proceed with further studies of well-ordered gold nanostructures on thin membranes and their utilization to couple light into wave-guided modes of these membranes.

References

1) L. Eurenius et al., Nature Photonics 2 (2008) 360

2) M. Mäder et al., J. Laser Micro/Nanoeng. 3, 9 (2008)