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Proceedings Paper

Multimode interference structures as sensing elements integrated into Mach-Zehnder interferometers in polymer foils
Author(s): Yanfen Xiao; Alexa Langenecker; Meike Hofmann; Stanislav Sherman; Uwe Gleissner; Claas Mueller; Hans Zappe
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Paper 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.

Paper Details

Date Published: 4 November 2016
PDF: 10 pages
Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 100250V (4 November 2016); doi: 10.1117/12.2247610
Show Author Affiliations
Yanfen Xiao, Univ. of Freiburg (Germany)
Alexa Langenecker, Univ. of Freiburg (Germany)
Meike Hofmann, Univ. of Freiburg (Germany)
Stanislav Sherman, Univ. of Freiburg (Germany)
Uwe Gleissner, Univ. of Freiburg (Germany)
Claas Mueller, Univ. of Freiburg (Germany)
Hans Zappe, Univ. of Freiburg (Germany)

Published in SPIE Proceedings Vol. 10025:
Advanced Sensor Systems and Applications VII
Tiegen Liu; Shibin Jiang; Rene Landgraf, Editor(s)

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