Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.53: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Shadow nanosphere lithography of nanospirals — •Bettina Frank, Jun Zhao, and Harald Giessen — Universität Stuttgart, Deutschland

We fabricated a hexagonal densely packed monolayer of polystyrene nanospheres (Langmuir-Blodgett film) with 450 nm diameter. Coating a 1 cm² glass substrate with such a monolayer resulted in a good evaporation mask for nanopinhole lithography [1] of high quality. We deposited planar gold nanospirals inbetween the nanosphere mask by polar and azimuthally stepper-motor controlled sample rotation during the evaporation process. Large-area samples of very high quality were obtained. Measuring reflectance spectra by FTIR-spectroscopy yields good agreement with FDTD simulations. We modified gap width and wire length of the spiral structure and studied the dependence of the optical spectra on these parameters. Such structures are useful for broadband optical nanoantennas that radiate preferentially into the third dimension.

[1] M. C. Gwinner, E. Koroknay, L. Fu, P. Patoka, W. Kandulski, M. Giersig, and H. Giessen, Small 5, 400 (2009).