@article{Tsianaka2025a,
  title = {Sensitivity Enhancement of a Micro Ring Resonator-Based Photonic Sensor by Using a Gelatin Methacryloyl Functional Coating for the Detection of Metoprolol},
  journal = {ACS Applied Optical Materials},
  abstract = {Aquatic environments are often contaminated with biopersistent pharmaceuticals, such as the β-blocker metoprolol. The quantitative determination of such pollutants is crucial for environmental monitoring. Therefore, a highly sensitive integrated photonic biosensor for the detection of minute concentrations of metoprolol is presented here. The sensor is based on a thermally robust ring resonator with a hydrogel coating for metoprolol adsorption. Hydrogels consisting of gelatin methacryloyl enabled an increase in the concentration of metoprolol ions in the vicinity of the photonic chip, resulting in high sensitivity of the sensor setup. Compared to an uncoated chip, an increase in sensitivity of up to a factor of 20 was observed. In combination with software-implemented signal processing, the setup showed a detection limit of less than 1 × 10–4 μmol mL–1. The combination of functional coating, thermally insensitive design, and applied digital signal postprocessing makes the system introduced here an attractive approach toward sensor-based wastewater analysis and monitoring.},
  month = jul,
  year = {2025},
  slug = {tsianaka2025a},
  author = {Tsianaka, Anastasia and Schweikert, Christian and Southan, Alexander and Hoppe, Niklas and Greul, Markus and Kaschel, Mathias and Vogel, Wolfgang and Berroth, Manfred and Rademacher, Georg and Tovar, G{\"u}nter E. M.},
  url = {https://doi.org/10.1021/acsaom.5c00149},
  month_numeric = {7}
}