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Photoacoustic microscopy (PAM) is a promising imaging modality that combines optical and ultrasound imaging. It combines the advantages of high ultrasonic spatial resolution and high optical contrast. When a short laser pulse illuminates the tissue, absorbed light leads to an acoustic emission via thermoelastic expansion [1]. The laser system needs to generate short enough pulses, i.e., several nanoseconds,...
Inspired by the idea of an artificial skin-like sensor structure, we develop fully integrated sensor networks in large-sized thin polymer foils. The project is part of collaborative research center “PlanOS-planar optronic systems”. One key aspect of such systems is to avoid electronic components as far as possible so that the quantities to be measured are directly converted into properties of light.
Fiber lasers have come to a great prominence when it comes to stable high power and excellent beam quahty. They are used in industry for material processing, space apphcations as well as in medicine for precise surgery. Despite their widespread application they are not understood completely when it comes to longitudinal mode (LM) with stochastic phase relations and resulting nonlinear effects like...
Low-cost biocompatible nanomaterials with opto-electronic properties are highly desirable as they may open avenue onto new biomedical imaging or sensing technologies. It was recently unveiled that short peptides self-assemble into various micro- and nano-structures including tubes, tapes and fibrils. These structures were found to possess striking mechanical, electrical and optical properties, which...
Driven by demands from medicine and the life sciences, for example, a variety of new point of care tests (POCT) based on smartphones are currently investigated [e.g. 1]. For instance, in combination with an external electrical read out system smartphones have been applied for the monitoring of diabetes or, by employing the smartphone camera, for the interrogation of lateral flow tests.
Fiber-optic Brillouin sensors for temperature and strain distributed monitoring offer unique performance in terms of distance, high spatial resolution and accuracy. Most of the available systems rely on Brillouin Optical Time-Domain Analysis (BOTDA) techniques, which employ pulsed pump signals guaranteeing a spatial resolution fundamentally limited to 1 meter [1]. An attractive alternative approach...
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