PoLightFilters is an EXIST research transfer project at the University of Cologne that develops angle-stable thin-film optical filters for precise imaging and sensor systems. Unlike conventional interference filters, whose spectrum “wanders” when light strikes at an angle, thereby limiting image quality and field of view, spectral transmission remains stable over large angles of incidence—made possible by strong light-matter coupling in thin organic layers and resonator structures. This opens up new applications for LiDAR, fluorescence microscopy, and industrial monitoring, where range, accuracy, and reproducible measurements over a wide field of view are crucial. The combination of customized filter design, materials science innovations, and proven manufacturability makes the technology OEM-ready and scalable; pilot projects with initial partners are in preparation. PoLightFilters thus offers a solution for reliable spectral filtering without angular compromises—a key to robust optics in automation, diagnostics, and sensor technology.
