Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 31: Poster I: Devices, Quantum Dots and Quantum Wires
HL 31.5: Poster
Dienstag, 23. März 2010, 18:30–20:30, Poster D1
Micro-Printing Setup for Selective Biofunctionalization of Micro-Resonators — •Julian Fischer1, Torsten Beck1, Simone Schleede1, Mario Hauser1, Tobias Grossmann1,2, Christoph Vannahme2, Timo Mappes2, and Heinz Kalt1 — 1Institut für Angewandte Physik, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Institut für Mikrostrukturtechnik, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Optical resonators with rotational symmetry like micro-spheres and micro-toroids have been introduced for label-free biomolecule detection. Semiconductor fabrication methods in combination with reflow processes are used to build high-Q optical cavities made of silica or PMMA. Whispering gallery-modes that are excited in the resonators polarize molecules attached to the resonator. This leads to a shift of the mode frequencies. For the parallel detection of different types of bio-molecules, each resonator on a chip has to be functionalized for a specific type of molecules. Therefore a high-voltage micro-printer was set up. A pipette (tip diameter 10-50 µ m) is fabricated by thermally extending a glass capillary tube using a standard glass tube puller. A shaped electric pulse is amplified to high voltage (∼ 1kV). The amplifier is connected to the capillary as anode and the substrate holder as cathode. The high electric field due to the voltage pulse generates a droplet impinging on the substrate. The scope of this economic and robust technique, that allows the precise depletion of femto- to nanoliters droplets, is presented.