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Contact-free precise laser processing of black widow spider (Latrodectus hesperus) dragline silk by laser ablation at λ=157 nm is achieved. At this wavelength, the small optical penetration depth, below 100 nm, allows efficient and gentle material removal above the ablation threshold of Φth=29 mJ/cm2. The ablation rate in nm/pulse is measured against laser fluence Φ and simultaneously calibrated with...
We report on the femtosecond laser fabrication of micro-channels of sub-micrometer cross section recorded in polymethylmethacrylate (PMMA) films in a single processing step. Both axial lengths of an elliptical cross section smaller than 0.4 μm were achieved for a fabrication irradiance close to the dielectric breakdown of PMMA. Femtosecond pulsed irradiation was scanned along the three-dimensional...
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