Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Nanostructures at surfaces: Arrays

O 19.5: Vortrag

Dienstag, 24. März 2009, 11:30–11:45, SCH A215

Sub-wavelength patterning of organic monolayers via nonlinear processing with single femtosecond laser pulses — •Nils Hartmann1, Steffen Franzka1, Jürgen Koch2, Andreas Ostendorf2, and Boris N. Chichkov21Fachbereich Chemie and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen (UDE), Universitätsstraße 5, 45117 Essen — 2Laser Zentrum Hannover e. V., Hollerithallee 8, 30419 Hannover

Femtosecond laser patterning of octadecylsiloxane monolayers on quartz glass at a wavelength of 800 nm, pulse lengths < 30 fs and ambient conditions has been investigated. Due to its optical band gap of 8.5 eV, quartz glass represents an ideal platform for femtosecond laser processing of silane-based monolayers via nonlinear absorption processes. Selective decomposition of the coating with single laser pulses at sub-wavelength resolution can be achieved over a wide range of fluences from 4.2 down to 3.1 J/cm2. In particular, at a 1/e laser spot diameter of 1.8 microns, structures with a width of 250 nm and below were fabricated. This opens up a facile route towards laser fabrication of transparent templates with chemical structures down into the sub-100 nm regime [1]. Such templates represent promising platforms for biotechnological applications, e. g. biosensor arrays and microfluidic chips.

1. N. Hartmann, S. Franzka, J. Koch, B. N. Chichkov, A. Ostendorf, Appl. Phys. Lett. 92 (2008) 223111.

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