Narrowband absorbing and reflecting optical filters
OwnerWilliam H Southwellinventor
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Abstract
This invention consists of two new types of narrowband optical interference filters that expand the current state-of-the-art narrowband filtering. Prior narrowband filters have a high transmission for a narrow wavelength band and reflect light from surrounding wavelengths. The filters of this invention allow for narrowband absorption and narrowband reflection. These new filters include a thin absorbing layer with the standard dielectric layers.
Claims2
A narrowband optical interference filter consisting of layers of low- and high-index dielectric materials and a single absorbing layer that is 10 nm thick on an optical substrate comprising a specified number of layers with specified layer thicknesses that reflects light except for a narrowband region where it is absorbed with a near 100% peak absorption and a full width at half max of 0.5 nm.
A narrowband optical interference filter consisting of layers of low- and high-index dielectric materials with one or more metal layers on an optical substrate comprising a specified number of layers with specified layer thicknesses that absorbs light except for a narrowband region where it is reflected.
Dependencies are inferred from the claim text.