Provided are an optical filter having excellent light fastness and moisture resistance and having excellent detection accuracy, a structure, and an optical sensor. An optical filter 10a includes a near infrared transmitting filter 1 and a dielectric multi-layer film 2. In this optical filter, the dielectric multi-layer film 2 and the near infrared transmitting filter 1 are in contact with each other, or an organic layer 3 is provided between the dielectric multi-layer film 2 and the near infrared transmitting filter 3. In the optical filter, at least two wavelengths at which a transmittance in a wavelength range of 600 nm or longer and shorter than 1050 nm is 50% are present, and in a case where a wavelength on a shortest wavelength side is represented by λ1 and a wavelength on a longest wavelength side is represented by λ2 among the wavelengths at which the transmittance is 50%, predetermined conditions are satisfied.

An optical coating for a glass substrate includes an inner metal or metal alloy layer, a first pair of transparent conductive oxide or dielectric layers, and a pair of outer metal or metal alloy layers. The optical coating includes an eye-weighted transmittance of less than about 20% and an eye-weighted reflectance of less than about 30%, as measured with a D65 illuminant according to the CIE 10° Standard Observer.

Provided is an optical filter capable of reducing the dependency on the angle of light incidence. An optical filter 1 includes a hydrogenated silicon-containing film 4, wherein in a Raman spectrum of the hydrogenated silicon-containing film 4 measured by Raman spectroscopy a ratio (SiH/SiH.sub.2) obtained from a ratio between an area of a peak derived from SiH and an area of a peak derived from SiH.sub.2 is 0.7 or more.

A multilayer film according to an embodiment of the present disclosure includes: semiconductor layers; and dielectric layers. In each of the semiconductor layers, a value of an optical constant k1 for light having a wavelength in a visible light region among optical constants k is larger than a value of an optical constant k2 for light having a wavelength in an infrared light region. The optical constants k each serves as an extinction coefficient that includes an imaginary part of a complex refractive index. The semiconductor layers and the dielectric layers are alternately stacked and the multilayer film has an optical distance of 0.3 μm or more and 10 μm or less in a stack direction and absorbs at least a portion of visible light and transmits infrared light.

A rearview system may comprise a light sensor assembly having: a photosensor operable to detect light and generate a signal based, at least in part, on the detected light; a dichroic filter in optical communication with the photosensor and operable to filter light; and a rearview assembly having an electro-optic element may comprise an electro-optic medium and operable to variably change the amount of light passing through the electro-optic medium based, at least in part, on the signal. The dichroic filter may be configured to substantially inhibit light having a wavelength of less than 400 nm or greater than 650 nm from transmitting therethrough.

A single crystal multilayer low-loss optical component including first and second layers made from dissimilar materials, with the materials including the first layer lattice-matched to the materials including the second layer. The first and second layers are grown epitaxially in pairs on a growth substrate to which the materials of the first layer are also lattice-matched, such that a single crystal multilayer optical component is formed. The optical component may further include a second substrate to which the layer pairs are wafer bonded after being removed from the growth substrate.

An optical system (150) is disclosed and includes an optical sensor (154), a plurality of photosensitive pixels (178) disposed on the optical sensor, a wavelength-selective optical filter (158) in optical communication with the photosensitive pixels, the wavelength-selective optical filter being disposed remotely from the optical sensor, and a plurality of spatially-variant areas (220, 224, 228, 232) disposed in the optical filter, at least one area of the plurality of spatially-variant areas including a downconverter (400, 500).

An antireflection film has high infrared transmittance and excellent flexibility. An antireflection layer includes a base material, a hard coat layer, an adhesion layer, and an antireflection layer in this order, wherein the antireflection layer includes, from the adhesion layer side, a first high refractive index layer having an optical thickness of 41 to 52 nm, a first low refractive index layer having an optical thickness of 41 to 53 nm, a second high refractive index layer having an optical thickness of 302 to 313 nm, and a second low refractive index layer having an optical thickness of 135 to 196 nm.

A sensor window may include a substrate and a set of layers disposed onto the substrate. The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index. The set of layers may be associated with a threshold transmissivity in a sensing spectral range. The set of layers may be configured to a particular color in a visible spectral range and may be associated with a threshold opacity in the visible spectral range.

A light detection device includes: a first support part disposed on a mounting surface of the wiring board; a Fabry-Perot interference filter disposed in a first support region of the first support part; and a temperature detector, wherein the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface and such that at least a part of the temperature detector overlaps a part of the first support part when seen in a second direction in which the first support part and the light detector are aligned with each other, and wherein a first distance between the temperature detector and the first support part in the second direction is smaller than a first width of the first support region in the second direction.