Integrated mechano-optical hydrogen gas sensor using cantilever bending readout with a Si3N4 grated waveguide |
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Authors: | Pham So V Dijkstra Meindert van Wolferen Henk A G M Pollnau Markus Krijnen Gijs J M Hoekstra Hugo J W M |
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Institution: | Integrated Optical MicroSystems (IOMS) Group, University of Twente P.O. Box 217, 7500 AE Enschede, The Netherlands. s.v.pham@ewi.utwente.nl |
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Abstract: | We demonstrate a proof of concept of a novel and compact integrated mechano-optical sensor for H(2) detection based on a microcantilever suspended above a Si(3)N(4) grated waveguide. The fabricated devices are mechanically and optically modeled and characterized. Sensing operation of the sensor is demonstrated with 1% H(2) in N(2). The error in detection of the cantilever bending induced by absorption of H(2) is estimated to be approximately 10 nm. Significantly improved sensitivity (down to ~33 pm) is expected for reduced initial bending of the microcantilever. The simulation and experimental results are in good agreement and provide a good guideline for further optimization of the sensor. |
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