Holler, T.T.HollerBöttner, H.H.BöttnerDumbs, A.A.Dumbs2022-03-082022-03-081992https://publica.fraunhofer.de/handle/publica/320124Strip waveguides have been fabricated in a thin film consisting of a mixture of poly(methylmethacrylate) (PMMA) with a UV-sensitive photoinitiator. The film is deposited by spincoating on a PMMA substrate. As an example for a sensor application, the waveguides were doped with the pH-indicator dye bromophenol blue, which changes the optical behaviour of the lightguide in interaction with a humid environment like an aqueous liquid or a gas.enabsorptiongas sensorgassensorintegrated opticsintegrierte OptikpH-sensorpolymer waveguidePolymer-Wellenleiter621conference paper