Abstract: An interference filter includes first and second reflecting films opposed to each other across a gap, the first and second reflecting films include an Ag—Sm—Cu alloy film or an Ag—Bi—Nd alloy film, the Ag—Sm—Cu alloy film includes 0.1 atomic %?Sm?0.5 atomic %, and 0.1 atomic %?Cu and ?0.5 atomic %, and Sm+Cu?1.0 atomic %, the Ag—Bi—Nd alloy film includes 0.1 atomic %?Bi?3.0 atomic %, and 0.1 atomic %?Nd?5.0 atomic %, and the thickness of the Ag—Sm—Cu alloy film or the Ag—Bi—Nd alloy film is ?10 nm and ?40 nm.

Abstract: A spectral camera includes a wavelength variable interference filter, an imaging unit having a plurality of light receiving elements arranged in a two-dimensional array configuration, and a wavelength acquisition unit which acquires center wavelengths of light beams received by the light receiving elements in accordance with signal values output from the light receiving elements when reference light is received by the imaging unit. Light amounts of the reference light corresponding to different wavelength components in a certain wavelength range are uniform in a plane, and different signal values are acquired when light beams of the different wavelength components are received by the light receiving elements.

Abstract: An optical filter includes: a first variable wavelength bandpass filter that can extract light of a first wavelength band (400 to 460 nm), the first wavelength band having a first spectral band having a central wavelength equal to a first wavelength in the first wavelength band and a second spectral band having a central wavelength equal to a second wavelength in the first wavelength band; and a second variable wavelength bandpass filter that can extract light of a second wavelength band (480 to 540 nm) adjacent to the first wavelength band, the second wavelength band having a third spectral band having a central wavelength equal to a third wavelength in the second wavelength band and a fourth spectral band having a central wavelength equal to a fourth wavelength in the second wavelength band.

Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.

Abstract: A spectrometry device includes a wavelength-tunable interference filter that is provided with a stationary reflection film, a movable reflection film and an electrostatic actuator which changes a gap dimension between the stationary reflection film and the movable reflection film; a detector that receives incident light; a filter control unit that sets the gap dimension between the stationary reflection film and the movable reflection film to be a first dimension corresponding to light having a first wavelength which is smaller than that of a measurement target wavelength region; a cutoff filter that cuts off the light having a wavelength which is smaller than that of the measurement target wavelength region; and a light quantity acquisition unit that acquires the light quantity of stray light received by the detector when the gap dimension is changed to be the first dimension.

Abstract: Provided is a photovoltaic device prepared with a compound semiconductor, capable of reducing hazardous property and improving efficiency, and a method for manufacturing the photovoltaic device, the photovoltaic device including a photoelectric conversion layer including a compound semiconductor, a semiconductor layer layered on a surface of the photoelectric conversion layer, a contact layer arranged on the opposite side of the semiconductor layer to the photoelectric conversion layer, and an electrode layered on a surface of the contact layer, wherein the semiconductor layer includes a first crystal including Al, In, and P, and the contact layer includes a second crystal including Ge as a main component.

Abstract: An optical filter device includes a variable wavelength interference filter having a pair of reflecting films opposed to each other, and an electrostatic actuator adapted to change a gap dimension between the pair of reflecting films, and at least one bandpass filter disposed on an optical axis of the pair of reflecting films, and the bandpass filter includes a plurality of transmission wavelength bands in which light is transmitted.

Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.

Abstract: A light filter has a first reflecting film and a second reflecting film opposed to each other, a first electrode, a second electrode, a third electrode, a fourth electrode, and a potential difference control unit, the first electrode and the third electrode are opposed at a first distance, the second electrode and the fourth electrode are opposed at a second distance different from the first distance, the potential difference control unit brings the first electrode and the third electrode into contact by producing a potential difference between the first electrode and the third electrode and brings the second electrode and the fourth electrode into contact by producing a potential difference between the second electrode and the fourth electrode, and thereby, a gap between the first reflecting film and the second reflecting film may be controlled with high accuracy.

Abstract: An optical filter device includes a housing including a light passage hole making light incident on the inner side, an aperture on the outer side of the housing and limiting the light made incident on the incident light passage hole, and an interference filter on the inner side of the housing and including a fixed reflection film and a movable reflection film. In a plan view of the fixed reflection film and the movable reflection film, an opening of the aperture, the light passage hole, and the fixed reflection film and the movable reflection film overlap one another. When the diameter of the fixed reflection film close to the light passage hole is ?m, the bore of the light passage hole is ?p, and the opening diameter of the aperture is ?a, ?a<?m<?p.

Abstract: A communication system includes a transmission terminal for displaying a color code having a plurality of colors of code patterns arranged two-dimensionally, and a spectroscopic measurement device including a variable wavelength interference filter for dispersing the light from the image displayed on the transmission terminal, an imaging section adapted to image the light dispersed by the variable wavelength interference filter to obtain a spectral image, a colorimetric section adapted to measure a dispersion spectrum of each of pixels in each of spectral images of a plurality of wavelengths with respect to the color code based on the light intensity value in each of the pixels, in the case in which the spectral images are obtained, and a decode section adapted to detect an arrangement of the code patterns based on the pixel positions and the dispersion spectrums of the respective pixels, and decode the color code.

Abstract: A spectrometry device includes a wavelength-tunable interference filter that is provided with a stationary reflection film, a movable reflection film and an electrostatic actuator which changes a gap dimension between the stationary reflection film and the movable reflection film; a detector that receives incident light; a filter control unit that sets the gap dimension between the stationary reflection film and the movable reflection film to be a first dimension corresponding to light having a first wavelength which is smaller than that of a measurement target wavelength region; a cutoff filter that cuts off the light having a wavelength which is smaller than that of the measurement target wavelength region; and a light quantity acquisition unit that acquires the light quantity of stray light received by the detector when the gap dimension is changed to be the first dimension.

Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.

Abstract: A wavelength-variable interference filter includes first and second electrodes provided at first and second substrates, respectively, the second substrate including a movable section, first and second electrode wires that extend from the first and second electrodes toward outer circumferential edges of the first and second substrates, respectively, a first opposite electrode wire disposed so as to be isolated from the second electrode, and a first conductive section that connects the first electrode wire with the first opposite electrode wire. The second electrode wire and the first opposite electrode wire extend passing through a center point of an imaginary circle of the movable section in respective directions and dividing the imaginary circle at regular angular intervals.

Abstract: An optical module includes a stationary substrate, a movable substrate, a stationary reflecting film provided to the stationary substrate, a movable reflecting film provided to the movable substrate and opposed to the stationary reflecting film, a first control electrode disposed outside the stationary reflecting film in a filter plan view, a second control electrode disposed outside the movable reflecting film in the filter plan view, and opposed to the first control electrode, and a tilt control section adapted to make a first control current flow through the first control electrode, and make a second control current, which has an opposite direction to the first control current in the filter plan view, flow through the second control electrode.

Abstract: A spectrometer includes a first reflective film, a second reflective film facing the first reflective film with a gap interposed therebetween, a gap change portion that changes the amount of the gap by changing the relative position of the second reflective film with respect to the first reflective film, and a processing unit that outputs optical characteristic data at a predetermined first wavelength interval on the basis of light of a plurality of the wavelengths to be measured which are extracted by the first reflective film and the second reflective film by changing the gap amount using the gap change portion, wherein a full width at half maximum of a spectrum of at least one component of light among the light of the plurality of wavelengths to be measured which are extracted by the first reflective film and the second reflective film is larger than the first wavelength interval.

Abstract: An optical module includes a wavelength variable interference filter having a fixed reflective film, a movable reflective film which faces the fixed reflective film with a gap between reflective films interposed therebetween, and an electrostatic actuator that changes the gap between reflective films, and a gap control unit that controls the electrostatic actuator. The gap control unit controls the electrostatic actuator on the basis of an order which is set in accordance with a wavelength to be measured, and changes the gap between the reflective films.

Abstract: A variable-wavelength interference filter includes: a first substrate; a second substrate facing the first substrate; a first reflection layer provided on a surface facing the second substrate, of the first substrate; a second reflection layer which is provided on a surface facing the first substrate, of the second substrate, and faces the first reflection layer via an inter-layer gap; and an electrostatic actuator which flexes the second substrate in a direction toward the first substrate and thus changes the inter-layer gap. The first reflection layer and the second reflection layer have a reflectance characteristic showing a higher reflectance to light with a second wavelength that is shorter than a first wavelength, than a reflectance to light with the first wavelength.

Abstract: A filter includes a fixed substrate, a movable substrate opposed to the fixed substrate, a first reflection film provided on a surface of the fixed substrate facing the movable substrate, a second reflection film provided on the movable substrate and opposed to the first reflection film across a gap, a first electrode provided on the surface of the fixed substrate facing the movable substrate, a second electrode provided on the movable substrate and opposed to the first electrode, bonding parts provided on opposing surfaces of the fixed and movable substrates and bonding the fixed substrate to the movable substrate, and a groove part provided in at least one of the opposing surfaces, and the gap is in communication with an exterior of the filter via the groove part.

Abstract: An optical filter includes a first substrate, a second substrate, a first reflective film that is disposed on the first substrate, a second reflective film that is disposed on the second substrate, first and second fixed electrodes that are disposed on the first substrate at positions located at the periphery of the first reflective film in plan view, and first and second variable electrodes that are disposed on the second substrate and face the first and second fixed electrodes. Slit portions of the second variable electrode are formed such that the first and second variable electrodes have a center symmetrical structure with the reflective film as its center.