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Q: Fachverband Quantenoptik und Photonik
Q 39: Poster V
Q 39.2: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Aula Foyer
Application of an integrated optical Mach-Zehnder interferometer for chemical sensing — •Johannes Schnegas1, Karo Becker2, Alexander Szameit2, and Udo Kragl1 — 1Universität Rostock, Institut für Chemie, Rostock, Deutschland — 2Universität Rostock, Institut für Physik, Rostock, Deutschland
Integrated optics offers a great advantage in the field of analytical chemistry to produce miniaturised optical sensors for the selective detection of analytes. An interesting sensor application are integrated optical interferometers, such as the Mach-Zehnder interferometer. This approach has been tested successfully for the concentration measurement and selective detection of proteins, gases, and DNA fragments. Real-time detection of small changes in the surrounding refractive index is possible. Most publications describe integrated optical MZI fabricated by photolithography, where the optical waveguides are made of silicon nitride or polymers. These waveguides were placed directly on a support such as silicon. In this work, an integrated optical MZI made of femtosecond laser-written near-surface waveguides is tested as a chemical sensor. The concept of near-surface waveguides as chemical sensor such as oils has already been tested. In this study, integrated optical Mach-Zehnder interferometers were tested for their ability to detect different types of analytes, with the intention of using the integrated optical interferometer for concentration measurement.
Keywords: interferometry; integrated optics device; chemical sensing; surface sensing; laser-written waveguide