Weingartner, ErnestBilal, JonasSteigmeier, PeterJundt, GregorHäusler, SamuelLenner, MiklósFlöry, NikolausBittner, MatthiasBetschon, Felix2024-08-152024-08-152023-11-0710.5281/zenodo.10077921https://irf.fhnw.ch/handle/11654/46561https://doi.org/10.26041/fhnw-9633Photonic integration on a chip has the potential to develop new low-cost, high-performance sensing devices. A proof of concept of the sensing capabilities of a waveguide-based photothermal interferometer for the measurement of traces of light-absorbing substances (soot particles, gases) has been achieved. The measurement principle can also be extended to a wide range of other applications such as refractive index measurements, or vibration/distance sensors. A unique feature is that the waveguide technology allows for a passive operation of the interferometer, i.e., no quadrature point control is required.en620 - Ingenieurwissenschaften und Maschinenbau04B - Beitrag Konferenzschrift