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Publications (4)3.47 Total impact

  • S. Eve, N. Huber, A. Last, O. Kraft
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    ABSTRACT: The thermal and mechanical fatigue behavior of thin metal films on polymer substrates has been investigated and compared for different combinations of materials, which are typical for micro-optical components: gold or aluminum film deposited on PolyCarbonate (PC) or PolyMethylMethAcrylate (PMMA) substrate. Mechanical fatigue testing has been carried out using an experimental setup, which allows for testing in an equi-biaxial loading condition, mimicking the strain state of the film during thermal cycling. Using scanning electron microscopy, fatigue damage morphologies for the different film/substrate combinations have been found to be quite different for both thermal and mechanical cycling. Furthermore, our results indicate a somewhat lower resistance of the films deposited onto PMMA as compared to PC to both thermal and mechanical fatigue. Under mechanical loading, Au/PC specimens show a longer time to failure as compared to the Al/PC specimens.
    Thin Solid Films 02/2009; 517(8):2702-2707. · 1.87 Impact Factor
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    ABSTRACT: In this article, we describe a new experimental setup which has been developed to investigate the fatigue behavior of thin metal films on polymer substrates as used in micro-optical components. The setup is based on the ring-on-ring test and includes an optical in situ failure detection system. The method is validated for thin Au films by comparing the in situ results with microscopical analyses using scanning electron and atomic force microscopies.
    Review of Scientific Instruments 10/2006; 77(10):103902-103902-8. · 1.60 Impact Factor
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    ABSTRACT: We discuss on-going reliability studies of micro-optical components and assemblies as conducted in the EU FP6 Network of Excellence on Micro-Optics "NEMO". We focus on three case studies including first biaxial fatigue testing of micro-optical components, second reliability testing and quality control of MEMS and third micro-interferometric tomography for measuring optical fibre refractive index changes. For each of these case studies we discuss the dedicated measurement and characterization methods as well as first results and the perspectives for future research.
    Proc SPIE 05/2006;
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    ABSTRACT: A new experimental setup, which allows for testing in an equi-biaxial loading condition, has been developed and applied to investigate the fatigue behaviour of thin films. A load controlled cycling, performed at room temperature on flat specimens, reproduces the strain amplitude and mean strain in the film corresponding to a thermal cycling in a given temperature range. The setup is based on the ring-on-ring test, which has been successfully used in biaxial fracture testing of glass and ceramics, and includes an optical in-situ failure detection system. The method is validated for specimens consisting in a gold film deposited on a polymer substrate.
    AIP Conference Proceedings. 02/2006; 817(1).