Lab-in-a-Needle – Multiplexed Fiber Sensors for Bio-Medical Applications

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In this project, we will use our newly developed fabrication capabilities of optical-grade dicing of micro-optical elements to explore the concept of a lab-in-a-needle realized in an optical fiber. We will concentrate on a detailed, mostly experimental but also theoretical evaluation of this new sensor concept, i.e. multiplexing of several, closely spaced sensors at the tip of a single fiber – a topic that has been hardly investigated up to now. The planned tasks will not only include several Fabry-Pérot (FP) sensor cavities but also a combination with evanescent-field-type sensors. Open questions like e.g. the achievable sensitivity and accuracy when using several adjacent FP cavities, possible detrimental cross-talk among certain sensors, ways to circumvent the latter effect, as well as excitation and light collection efficiencies of the proposed evanescent field sensors will be investigated in detail.