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Erscheinungsjahr
- 1997 (7) (entfernen)
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- Englisch (5)
- Deutsch (1)
- Mehrsprachig (1)
Schlagworte
- Ablation (1)
- Biosensor (1)
- Femtosecond pulse laser (1)
- GIXD (1)
- Glass (1)
- Glucose (1)
- Laser processing (1)
- Membrane perforation (1)
- Micromachining (1)
- Reproducibility (1)
Structuring of dielectric and metallic materials with ultrashort laser pulses between 20 fs and 3 ps
(1997)
Laser-micromachining of barium aluminum borosilicate glass, fused silica and stainless steel has been extended down to a pulse duration of 20 fs generated by a Ti:sapphire laser system at a wavelength of 0.8 micrometer. A systematic study shows that, below 100 fs, an enhanced precision and a substantial decrease of the ablation threshold fluence in comparison to pulse laser processing with pulses in the picosecond and nanosecond range could be achieved. The physical mechanism and the technical relevance of this novel microtechnology is discussed.
Subpicosecond Emission from Mercury and Silver into Electrolyte Solution: An Experimental Study
(1997)
Curved substrates can be micro-structured by laser ablation, which is not possible with standard lithographic methods. The novel femtosecond-pulse laser technique allows the production of defined and reproducible micro-perforations of originally analyte-impermeable membranes. The trans-membrane analyte flux can be controlled both by the variation of the laser focus diameter resulting in different areas of single perforations, and the number of perforations in arrays on small membrane areas. This leads to a higher degree of variability as well as reproducibility of the diffusion qualities of sensor membranes, and marks the main innovation with this technique compared to the hand-made mechanical perforation by specially grinded needles used up to now. Touchless micro-perforation of small membrane areas with negligible heat damage of the structures adjacent to the perforation allows the application of analyte door membranes directly onto curved surfaces of miniaturized needle-sensors assigned for in vivo glucose monitoring, for the first time.