An interference filter comprises a substrate, a filter stack and at least one absorption layer. The filter stack comprises alternating layers of optical coatings with different refractive indices arranged on the substrate. The at least one absorption layer is comprised of an optically absorbing material which is arranged on the substrate.

An electromagnetic wave sensor cover includes a cover body. The cover body includes a base layer made of synthetic resin and permitting passage of an electromagnetic wave, one or more metal oxide layers permitting passage of the electromagnetic wave and being conductive, one or more low refractive index layers permitting passage of the electromagnetic wave and made of material that has a lower refractive index than material of the metal oxide layer, and two electrodes. The base layer includes a front surface and a rear surface in a transmission direction of the electromagnetic wave. The metal oxide layer and the low refractive index layer are laminated adjacent to each other in the transmission direction. A laminate of the metal oxide layer and the low refractive index layer is laminated on the front surface or the rear surface of the base layer.

A pixelated filter wherein each pixel of the pixelated filter includes an interference filter including a stack of layers, and one or a plurality of waveguides each crossing all or part of the layers of said interference filter. In each pixel of the pixelated filter, the waveguide are configured to guide at least one optical mode and so that an evanescent portion of said at least one guided mode is filtered by the interference filter of the pixel.

An optical filter comprises at least one optical member that transmits light, wherein a first optical film that reflects at least one of light in a longer wavelength band than a first wavelength and light in a shorter wavelength band than a second wavelength is formed on a first surface, and a second optical film that reflects at least one of light in a longer wavelength band than a third wavelength and light in a shorter wavelength band than a fourth wavelength is formed on a second surface, the second surface being different from the first surface, and the first wavelength and the third wavelength are different from each other by a first predetermined amount, and the second wavelength and the fourth wavelength are different from each other by a second predetermined amount.

Multilayer metallo-dielectric energy control coatings are disclosed in which one or more layers are formed from a hydrogenated metal nitride dielectric, which may be hydrogenated during or after dielectric deposition. Properties of the multilayer coating may be configured by appropriately tuning the hydrogen concentration (and/or the spatial profile thereof) in one or more hydrogenated metal nitride dielectric layers. One or more metal layers of the multilayer coating may be formed on a hydrogenated nitride dielectric layer, thereby facilitating adhesion of the metal with a low percolation threshold and enabling the formation of thin metal layers that exhibit substantial transparency in the visible spectrum. Optical properties of the coating may be tuned through modulation of metal-dielectric interface roughness and dispersion of metal nanoparticles in the dielectric layer. Electrical busbars and micro-nano electrical grids may be integrated with one or more metal layers to provide functionality such as de-icing and defogging.

Provided is a laminate having a good whiteness and a high infrared-shielding property. Provided are also a kit forming the above-mentioned laminate, a method for producing a laminate, and an optical sensor. The laminate includes an infrared-shielding layer and a white layer, in which the infrared-shielding layer is a layer that shields at least a part of a wavelength range at 800 to 1,500 nm, and the white layer has a value of L* of 35 to 100, a value of a* of −20 to 20, and a value of b* of −40 to 30 in a L*a*b* color coordinate system of CIE 1976.

An interference filter module comprises two optical fiber collimators arranged on an optical axis so as to be opposed to each other, interference filters, and a casing including a main body portion and filter holding portions to be mounted into the main body portion, which are configured to hold the interference filters. Two interference filters including a kth filter when counted from a front end and a k-th filter when counted from a rear end are determined as a k-th set. The two interference filters of the k-th set are accommodated in two filter holding portions, each of which is a k-th holding portion when counted from the front end and the rear end, respectively. The two filter holding portions have rotation axes in directions orthogonal to a fore-and-aft direction and are rotatably held by the casing. The rotation axes of the filter holding portions are orthogonal to each other.

A texture recognition device and a display device are provided. The texture recognition device includes a backlight element, configured to provide first backlight; a light constraint element, configured to perform a light divergence angle constraint process on the first backlight to obtain second backlight with a divergence angle within a preset angle range, the second backlight being transmitted to a detection object; and a photosensitive element, configured to detect the second backlight reflected by a texture of the detection object to recognize a texture image of the texture of the detection object.

Multilayer metallo-dielectric energy control coatings are disclosed in which one or more layers are formed from a hydrogenated metal nitride dielectric, which may be hydrogenated during or after dielectric deposition. Properties of the multilayer coating may be configured by appropriately tuning the hydrogen concentration (and/or the spatial profile thereof) in one or more hydrogenated metal nitride dielectric layers. One or more metal layers of the multilayer coating may be formed on a hydrogenated nitride dielectric layer, thereby facilitating adhesion of the metal with a low percolation threshold and enabling the formation of thin metal layers that exhibit substantial transparency in the visible spectrum. Optical properties of the coating may be tuned through modulation of metal-dielectric interface roughness and dispersion of metal nanoparticles in the dielectric layer. Electrical busbars and micro-nano electrical grids may be integrated with one or more metal layers to provide functionality such as de-icing and defogging.

A window for a sensing system is provided. The window includes a substrate having a predetermined thickness and an index of refraction for electromagnetic radiation having a wavelength of 905 nm and a layered film disposed on the substrate, the layered film including alternating layers of a high refractive index material and a lower refractive index material, the high refractive index material having a higher refractive index than the lower refractive index material, wherein each layer of the alternating layers of the layered film has a thickness, and the thicknesses of the alternating layers are configured so that the window has a transmittance of at least 80% for electromagnetic radiation having a wavelength within the range of 850 nm to 950 nm. The window further includes a hardness of at least 10 GPa, at the layered film, as measured by the Berkovich Indenter Hardness Test.