@article{KeferPapeRothetal.2021, author = {Kefer, Stefan and Pape, Dominik and Roth, Gian-Luca and Hessler, Steffen and Schmauss, Bernhard and Hellmann, Ralf}, title = {Micromilling-assisted fabrication of monolithic polymer ridge-type waveguides with integrated photonic sensing structures}, series = {Optical Materials Express}, volume = {11}, journal = {Optical Materials Express}, number = {8}, doi = {https://doi.org/10.1364/OME.425778}, pages = {2389 -- 2400}, year = {2021}, abstract = {This study demonstrates and discusses a novel approach for the fabrication and rapid prototyping of monolithic photonic platforms comprising a ridge-type waveguide with integrated sensing structures. First, the bulk injection-molded cyclic olefin copolymer substrates are micromilled in order to define the physical extension of the ridge structure. Cross-sections down to 30 × 30 µm2, exhibiting a mean surface roughness of 300 nm, are achieved with this process. Subsequently, UV radiation is used to modify the ridge structure's refractive index, which leads to the formation of an optical waveguide. By employing a phase mask, it is possible to equip the photonic platform with a Bragg grating suitable for temperature measurements with a sensitivity of -5.1 pm K-1. Furthermore, an integrated Fabry-P{\´e}rot cavity, generated during the micromilling step as well, enables refractive index measurements with sensitivities up to 1154 nm RIU-1.}, subject = {Bragg-Reflektor}, language = {en} } @incollection{KeferRothKaloudisetal.2021, author = {Kefer, Stefan and Roth, Frederick and Kaloudis, Michael and Schmauss, Bernhard and Hellmann, Ralf}, title = {Monitoring of Composite Bicycle Components using Polymer Planar Bragg Gratings}, series = {SMSI 2021 - Sensors and Instrumentation}, booktitle = {SMSI 2021 - Sensors and Instrumentation}, publisher = {AMA Service GmbH}, address = {Wunstorf, Germany}, isbn = {978-3-9819376-4-0}, doi = {10.5162/SMSI2021/B9.2}, pages = {161 -- 162}, year = {2021}, abstract = {This study demonstrates mobile load monitoring of a composite bicycle component using an application- customized polymer planar Bragg grating sensor, evaluated by a mobile interrogation unit. After a referencing procedure, the mechanical load of a seat post is monitored while cycling through a test track.}, subject = {Bragg-Reflektor}, language = {en} }