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Benjamin Redlingshöfer

Bio: Benjamin Redlingshöfer is an academic researcher from University of Erlangen-Nuremberg. The author has contributed to research in topics: Femtosecond pulse shaping & Laser pumping. The author has an hindex of 1, co-authored 1 publications receiving 257 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a comparative study of the ablation of metal with micro-, nano-, pico-and femtosecond laser pulses was presented, where the authors attributed the generally lower medium laser power of the ultrafast laser systems, on the other hand to the changed ablation mechanisms.

323 citations


Cited by
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Journal ArticleDOI
TL;DR: An overview of laser beam micro machining (LBMM) is given in this paper, where the fundamental understanding of ultrafast laser ablation process has been elucidated and various research activities performed with nanosecond, picosecond and femtosecond lasers have been discussed to understand the physical mechanisms and critical experimental parameters involved in the LBMM.

197 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the current knowledge in the field of multi-scale surface textures applied to tribological systems from an experimental and numerical point of view is presented, and the existing knowledge and hypotheses about the underlying driven mechanisms responsible for the improved tribological performance of multiscale textures are summarized, and future trends in this research direction are emphasized.
Abstract: Surface texturing has been frequently used for tribological purposes in the last three decades due to its great potential to reduce friction and wear. Although biological systems advocate the use of hierarchical, multi-scale surface textures, most of the published experimental and numerical works have mainly addressed effects induced by single-scale surface textures. Therefore, it can be assumed that the potential of multi-scale surface texturing to further optimize friction and wear is underexplored. The aim of this review article is to shed some light on the current knowledge in the field of multi-scale surface textures applied to tribological systems from an experimental and numerical point of view. Initially, fabrication techniques with their respective advantages and disadvantages regarding the ability to create multi-scale surface textures are summarized. Afterwards, the existing state-of-the-art regarding experimental work performed to explore the potential, as well as the underlying effects of multi-scale textures under dry and lubricated conditions, is presented. Subsequently, numerical approaches to predict the behavior of multi-scale surface texturing under lubricated conditions are elucidated. Finally, the existing knowledge and hypotheses about the underlying driven mechanisms responsible for the improved tribological performance of multi-scale textures are summarized, and future trends in this research direction are emphasized.

119 citations

Journal ArticleDOI
TL;DR: Biomedicine, catalysis and sensing are the application areas mainly discussed in this review, highlighting advantages of laser-synthesized nanoparticles for these types of applications and, once partially resolved, the limitations to the technique for large-scale applications.
Abstract: Laser synthesis emerges as a suitable technique to produce ligand-free nanoparticles, alloys and functionalized nanomaterials for catalysis, imaging, biomedicine, energy and environmental applications. In the last decade, laser ablation and nanoparticle generation in liquids has proven to be a unique and efficient technique to generate, excite, fragment and conjugate a large variety of nanostructures in a scalable and clean way. In this work, we give an overview on the fundamentals of pulsed laser synthesis of nanocolloids and new information about its scalability towards selected applications. Biomedicine, catalysis and sensing are the application areas mainly discussed in this review, highlighting advantages of laser-synthesized nanoparticles for these types of applications and, once partially resolved, the limitations to the technique for large-scale applications.

104 citations

Journal ArticleDOI
23 Jul 2018
TL;DR: In this paper, a low-cost filter paper-based surface-enhanced Raman spectroscopy (SERS) substrates with salt-induced aggregated Ag/Au nanoparticles (NPs) were demonstrated as efficient SERS substrates for the detection of multiple explosive molecules such as picric acid (5 μM), 2,4-dinitrotoluene (1 μM) and 3-nitro-1, 2,2-4-triazol-5-one (10 μM).
Abstract: We present a systematic study on the fabrication, characterization of versatile, and low-cost filter paper-based surface-enhanced Raman spectroscopy (SERS) substrates loaded with salt-induced aggregated Ag/Au nanoparticles (NPs). These were demonstrated as efficient SERS substrates for the detection of multiple explosive molecules such as picric acid (5 μM), 2,4-dinitrotoluene (1 μM), and 3-nitro-1,2,4-triazol-5-one (10 μM) along with a common dye molecule (methylene blue, 5 nM). The concentrations of the dye and explosive molecules in terms of mass represent 31.98 pg, 11.45 ng, 1.82 ng, and 13.06 ng, respectively. Silver (Ag) and gold (Au) colloidal NPs were prepared by femtosecond laser (∼50 fs, 800 nm, 1 kHz) ablation of Ag/Au-target immersed in distilled water. Subsequently, the aggregated nanoparticles were achieved by mixing the pure Ag and Au NPs with different concentrations of NaCl. These aggregated NPs were characterized by UV-visible absorption and high-resolution transmission electron microscopy techniques. The SERS substrates were prepared by soaking the filter paper in aggregated NPs. The morphologies of the paper substrates were investigated using field-emission scanning electron microscopy technique. We have achieved superior enhancements with high reproducibility and sensitivity for filter paper substrates loaded with Ag/Au NPs mixed for an optimum concentration of 50 mM NaCl.

89 citations

Journal ArticleDOI
TL;DR: In this article, a review of capabilities and advances in micro-manufacturing technologies, metrology, and equipment demonstrates increased versatility across varied applications, while also highlighting limitations, and a guide for machining high-precision components with micro-scale features in process chains is given with respect to machine tools, tools, technology and environmental conditions.

80 citations