Abstract:
An optical filter is provided. The optical filter comprises a filter stack on a first side of a substrate, the filter stack includes alternating layers of hydrogenated silicon and layers of a lower-refractive-index material. A system comprising the optical filter is also provided.
Abstract:
In some implementations, an optical interference filter (200) includes a substrate (210); and a set of layers (220) that are disposed on the substrate. The set of layers includes a first subset of layers (230), wherein the first subset of layers comprises an aluminum nitride (AlN) material, and wherein a stress of the first subset of layers is between -1000 and 800 megapascals; and a second subset of layers (240), wherein the second subset of layers comprises at least one other material (e.g. hydrogenated silicon).
Abstract:
A single-layer birefringent crystal trim retarder (100) includes a birefringent crystal (110) cut such that its optic axis is at a high oblique angle (113)with respect to the retarder normal, thereby forming an O-plate and such that it provides low in-plane retardance values even when the birefringent crystal is relatively thick. To compensate for the inherent high +C-plate retardance of this high-tilt O-plate, the single-layer birefringent crystal is coupled with a -C-plate thin-film retarder (121, 131) to provide a trim retarder having an overall A/-C-plate retarder functionality. This full-function trim retarder is practical to fabricate, is thickness and azimuthal angle tolerant, and is suitable for low sensitivity angular clocking requirements of LCoS panel compensation.
Abstract:
An optical filter is provided. The optical filter comprises a filter stack on a first side of a substrate, the filter stack includes alternating layers of hydrogenated silicon and layers of a lower-refractive-index material. A system comprising the optical filter is also provided.
Abstract:
In some implementations, an optical interference filter (200) includes a substrate (210); and a set of layers (220) that are disposed on the substrate, wherein the set of layers includes: a first subset of layers (230); and a second subset of layers (240); wherein: each of the first subset of layers (230) comprises an aluminum nitride (AlN) material, a stress of each of the first subset of layers (230) is between -1000 and 800 megapascals, the first subset of layers (230) has a first refractive index with a first value, each of the second subset of layers (240) comprises at least one other material (e.g. hydrogenated silicon with helium material), the second subset of layers (240) has a second refractive index with a second value that is different than the first value, and the optical interference filter has an effective refractive index greater than or equal to 95% of a highest value of the first value and the second value.
Abstract:
An optical filter is described having a laterally variable transmission wavelength within a wavelength range, the optical filter comprising: a bandpass filter comprising a stack of alternating first and second layers comprising first and second materials, respectively; a blocking filter comprising a stack of alternating third and fourth layers, comprising third and fourth materials, respectively; wherein the first, second and fourth materials each comprise different materials, so that a refractive index of the first material is smaller than a refractive index of the second material, the refractive index of the second material is smaller than a refractive index of the fourth material, and an absorption coefficient of the second material is smaller than an absorption coefficient of the fourth material.
Abstract:
In some implementations, an optical interference filter (200) includes a substrate (210); and a set of layers (220) that are disposed on the substrate. The set of layers includes a first subset of layers (230), wherein the first subset of layers comprises an aluminum nitride (AlN) material; and a second subset of layers (240), wherein the second subset of layers comprises a hydrogenated silicon (Si:H) material.
Abstract:
An optical filter may include a substrate. The optical filter may include a set of alternating high refractive index layers and low refractive index layers disposed onto the substrate to polarization beam split incident light. The set of alternating high refractive index layers and low refractive index may layers may be disposed such that a first polarization of the incident light with a spectral range of less than approximately 800 nanometers (nm) is reflected by the optical filter and a second polarization of the incident light with a spectral range of greater than approximately 800 nm is passed through by the optical filter. The high refractive index layers may be hydrogenated silicon (Si:H). The low refractive index layers may be silicon dioxide (SiO 2 ).
Abstract:
An optical filter may include a substrate. The optical filter may include a set of alternating high refractive index layers and low refractive index layers disposed onto the substrate to polarization beam split incident light. The set of alternating high refractive index layers and low refractive index may layers may be disposed such that a first polarization of the incident light with a spectral range of less than approximately 800 nanometers (nm) is reflected by the optical filter and a second polarization of the incident light with a spectral range of greater than approximately 800 nm is passed through by the optical filter. The high refractive index layers may be hydrogenated silicon (Si:H). The low refractive index layers may be silicon dioxide (SiO 2 ).