4 November 2016 Multimode interference structures as sensing elements integrated into Mach-Zehnder interferometers in polymer foils
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Abstract
Integrated Mach-Zehnder interferometers (MZIs) based on flexible polymer materials have been demonstrated as evanescent field sensors for the detection of refractive indices and molecule concentrations. The used application of a measurement window in classical MZIs is difficult in a roll-to-roll fabrication process. We have previously demonstrated foil-based asymmetric MZIs with different widths in sensing and reference arm which do not need a measurement window. Here we present the use of a multimode interference structure (MMI) inserted into the sensing arm of the interferometer to increase the sensitivity. We consider the expected interference signal from numerical simulations and optimize the system in terms of sensitivity, dimensions and absorption losses. The fabricated MMI-MZI foils are tested experimentally to demonstrate the function of the MMI-MZI system by applying water/glucose solutions with different refractive indices.
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Yanfen Xiao, Yanfen Xiao, Alexa Langenecker, Alexa Langenecker, Meike Hofmann, Meike Hofmann, Stanislav Sherman, Stanislav Sherman, Uwe Gleissner, Uwe Gleissner, Claas Mueller, Claas Mueller, Hans Zappe, Hans Zappe, } "Multimode interference structures as sensing elements integrated into Mach-Zehnder interferometers in polymer foils", Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 100250V (4 November 2016); doi: 10.1117/12.2247610; https://doi.org/10.1117/12.2247610
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