Patent ID: 11906765

Abstract:
A thin-film interference filter has a thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of repeat unit blocks. The thin-film interference filter is flexible enough to be bendable to a radius of curvature of 250 mm or even less without permanently damaging the thin-film interference filter. The thin-film interference filter may have a second thin-film interference multi-layer stack composed of individual thin-film layers arranged in repeat unit blocks may have a different optical transmission spectrum. At least one interlayer between the first thin-film interference multi-layer stack and the second thin-film interference multi-layer stack may block a range of wavelengths of infrared, visible, or ultraviolet light. A defect layer of a different optical thickness than neighboring thin-film layers forming the repeat unit blocks, thereby creating a Fabry Perot resonance cavity.