WO2011024590A1 - 光学ユニット - Google Patents
光学ユニット Download PDFInfo
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- WO2011024590A1 WO2011024590A1 PCT/JP2010/062688 JP2010062688W WO2011024590A1 WO 2011024590 A1 WO2011024590 A1 WO 2011024590A1 JP 2010062688 W JP2010062688 W JP 2010062688W WO 2011024590 A1 WO2011024590 A1 WO 2011024590A1
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- WIPO (PCT)
- Prior art keywords
- light
- filter member
- optical unit
- substrate
- metal film
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 239000007769 metal material Substances 0.000 claims abstract description 17
- 239000010931 gold Substances 0.000 claims description 16
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052737 gold Inorganic materials 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 238000010183 spectrum analysis Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0256—Compact construction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
- G01J3/1895—Generating the spectrum; Monochromators using diffraction elements, e.g. grating using fiber Bragg gratings or gratings integrated in a waveguide
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/1013—Beam splitting or combining systems for splitting or combining different wavelengths for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
- G02B27/4244—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application in wavelength selecting devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1809—Diffraction gratings with pitch less than or comparable to the wavelength
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/204—Filters in which spectral selection is performed by means of a conductive grid or array, e.g. frequency selective surfaces
Definitions
- the present invention relates to an optical unit for performing spectrum analysis on transmitted light or reflected light from an object.
- a spectrophotometer is a device that measures the spectral distribution (spectral density) of a measurement object by irradiating the measurement object with light having different wavelengths.
- a spectrophotometer includes an optical unit and a control unit.
- the optical unit mainly includes a spectroscope and a photodetector.
- the spectrophotometer may include a light source optical unit in addition to the light receiving optical unit.
- the spectroscope splits transmitted light or reflected light from the object into light of a specific wavelength.
- the photodetector detects the dispersed light and outputs a signal according to the amount of the detected light. At this time, the output is performed for each wavelength of the detected light.
- the control unit calculates the luminance of the detected light for each output signal. As a result, a spectral distribution is obtained.
- a prism is conventionally known as a spectroscope constituting the optical unit.
- the optical unit and hence the spectrophotometer, is likely to increase in size, and it is difficult to reduce the cost of the spectrophotometer.
- a spectrophotometer using a band-pass filter that passes only light of a specific wavelength has been proposed as a spectroscope (see Patent Document 1).
- Patent Document 1 discloses an optical unit including three band-pass filters having different transmission wavelengths and three light-receiving elements corresponding to the respective band-pass filters.
- each band-band filter has a sheet shape and is arranged so that the main surfaces thereof coincide.
- Each light receiving element is arranged to receive light transmitted through the corresponding bandpass filter. Therefore, the corresponding light receiving element outputs a signal according to the wavelength of the received light.
- a general band-pass filter is formed by forming a metal film or an oxide film on a glass substrate.
- a band-pass filter it is difficult to narrow a transmission wavelength band.
- the optical units disclosed in Patent Documents 1 and 2 have a problem that it is difficult to increase the types of measurement wavelengths and the accuracy of spectrum analysis cannot be improved.
- An example of the object of the present invention is to provide an optical unit capable of solving the above-described problems and detecting a large number of lights having different wavelengths at a low cost.
- an optical unit includes a filter member that splits transmitted light, and a photodetector having a plurality of light receiving elements.
- the filter member includes a light-transmitting substrate, a plurality of protrusions formed of a first metal material on one surface of the substrate, and a second refractive index higher than that of the first metal material.
- the plurality of convex portions are arranged such that the metal film existing between adjacent convex portions serves as a diffraction grating, and the convex portions serve as a waveguide, At least one of the grating period of the diffraction grating, the height of the convex part, and the thickness of the metal film is different for each part so that the wavelength of light transmitted through the filter member changes for each part.
- Set to The photodetector is arranged such that each of the plurality of light receiving elements receives light transmitted through the filter member for each portion.
- the optical unit of the present invention it is possible to detect other numbers of light having different wavelengths at low cost.
- FIG. 1 is a cross-sectional view showing a schematic configuration of an optical unit according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view showing the configuration of the filter member shown in FIG.
- FIG. 3 is a perspective view for explaining the configuration of the filter member shown in FIG. 1.
- FIG. 4 is a cross-sectional view for explaining the function of the filter member shown in FIG.
- FIG. 5 is a diagram showing the relationship between each part of the filter member shown in FIG. 1 and the frequency of transmitted light.
- FIG. 5A is a diagram showing each part of the filter member shown in FIG. 1
- FIG. 5B is a diagram showing an example of mixed light incident on the filter member.
- FIG. 6 is a cross-sectional view showing a schematic configuration of another example of the optical unit in the embodiment of the present invention.
- FIG. 1 is a cross-sectional view showing a schematic configuration of an optical unit according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view showing the configuration of the filter member shown in FIG.
- FIG. 3 is a perspective view for explaining the configuration of the filter member shown in FIG. 1. In FIG. 2, only the cross section of the convex portion is hatched.
- the optical unit 10 in the present embodiment includes a filter member 1 that splits transmitted light and a photodetector 2 having a plurality of light receiving elements 22.
- reference numeral 3 denotes a base that becomes a frame of the optical unit 10.
- the filter member 1 is being fixed to the base
- the filter member 1 includes a substrate 11 having optical transparency, a plurality of convex portions 12 formed on one surface of the substrate 11, and a plurality of convex portions 12 together with the plurality of convex portions 12. And a metal film 13 covering one surface.
- Each convex portion 12 is formed of a first metal material, and the metal film 13 is formed of a second metal material having a refractive index higher than that of the first metal material. Further, as shown in FIGS. 2 and 3, the plurality of convex portions 12 are arranged so that the metal film 13 existing between the adjacent convex portions 12 becomes the diffraction grating 15 and each convex portion 12 becomes the waveguide 14. Has been.
- the filter member 1 at least one of the grating period p of the diffraction grating 15, the height h of the convex portion 12, and the thickness t of the metal film 13 changes the wavelength of light transmitted through the filter member 1 for each part. As such, different values are set for each part. That is, the filter member 1 is formed so that the wavelength of transmitted light is different for each portion.
- the grating period p of the diffraction grating 15 is substantially equal to one side of the other convex portion 12 from the side surface of one convex portion 12 between the adjacent convex portions 12, as shown in FIG. It is the distance to the side.
- FIG. 4 is a cross-sectional view for explaining the function of the filter member shown in FIG. In FIG. 4, the description of hatching is omitted for explanation.
- the metal film 13 existing between the convex portions 12 forms the diffraction grating 15 (see FIG. 4).
- the grating period p of the diffraction grating is greater than the wavelength of light that is required to be transmitted through the portion for each portion where the wavelength of transmitted light is different. Is also set to be shorter.
- the plurality of convex portions 12 are each preferably formed in a prismatic shape from the viewpoint of the performance of the diffraction grating 15, and are preferably arranged in a matrix as shown in FIG.
- the convex part 12 becomes a subwavelength grating, it functions as the waveguide 14, and as shown in FIG. 4, the incident light L1 incident on the filter member 1 propagates in the convex part 12 as an evanescent wave. . However, only light having a set frequency among the light included in the incident light L1 reaches the substrate 11 and passes through the substrate 11. Light of other frequencies is reflected by the substrate 11. In the example of FIG. 4, the incident light L1 is a mixed light including light having a wavelength ⁇ 1, light having a wavelength ⁇ 2, and light having a wavelength ⁇ 3, and only light having a wavelength ⁇ 1 passes through the filter member 1. .
- the filter member 1 shown in FIGS. 2 to 4 selects the wavelength of transmitted light by appropriately setting the shape of the diffraction grating 15, the refractive index of each member constituting the filter member 1, and the extinction coefficient of the convex portion 12. Can be done.
- the shape of the diffraction grating 15 can be set by the grating period p of the diffraction grating 15, the height h of the convex portion 12, and the thickness t of the metal film 13.
- the extinction coefficient of the convex portion 12 is a value that depends on the height h of the convex portion 12.
- the wavelength of transmitted light for each part. It is possible to obtain filter members 1 having different values. Specifically, if the height h of the convex portion 12 is increased, the wavelength of the transmitted light tends to shift to the longer wavelength side. Similarly, when the grating period p of the diffraction grating 15 is increased and the refractive index of the substrate 11 is increased, the wavelength of the transmitted light tends to shift to the longer wavelength side.
- the wavelength of transmitted light of each part is the grating period p of the diffraction grating 15 and the convex part 12.
- the height h and the thickness t of the metal film 13 are set.
- the transmitted light actually has a narrow band wavelength, and the wavelength of the transmitted light is set for the center wavelength in the narrow band.
- the material for forming the substrate 11, the convex portion 12, and the metal film 13 may be set as appropriate so that light having a target wavelength can be easily transmitted.
- the material for forming the substrate 11 is silicon oxide (SiO 2 ).
- the substrate 11 is a so-called quartz substrate.
- money (Au) is mentioned.
- titanium oxide (TiO 2 ) can be given.
- the transmitted light is light in the infrared region
- the refractive index of titanium oxide forming the metal film 13 is “1.904”
- the refractive index of silicon oxide forming the substrate 11 is “1.465”
- the reflectance of gold is “0.944”.
- the height h of the convex portion 12 is set to “62 ⁇ m”.
- the refractive index of gold is “0.50” and the extinction coefficient is “7.1”.
- the grating period p of the diffraction grating 15 may be set to “1064.7 ⁇ m”
- the thickness t of the metal film 13 may be set to “134 ⁇ m”.
- FIG. 5 is a diagram showing the relationship between each part of the filter member shown in FIG. 1 and the frequency of transmitted light.
- FIG. 5A is a diagram showing each part of the filter member shown in FIG. 1
- FIG. 5B is a diagram showing an example of mixed light incident on the filter member.
- the filter member 1 includes eight portions A1 to A8 having different wavelengths of transmitted light. For this reason, when the mixed light shown in FIG. 5B is incident on the filter member 1 as incident light, each light is transmitted only in a portion where light of that wavelength can be transmitted, and is reflected in other portions. For example, the light having the shortest wavelength in FIG. 5B passes through the portion A1.
- the filter member can be manufactured by the following manufacturing process. .
- a pretreatment is performed on the quartz substrate serving as the substrate 11 in order to improve adhesion with a gold film to be formed in the next step.
- a gold film is formed on one surface of the quartz substrate by sputtering or the like.
- a resist pattern is formed on the gold film in order to form the film into the convex portion 12.
- an electron beam (Electron Beam: EB) resist is coated on a gold film, and then the EB resist is processed into a set pattern shape by an electron beam drawing apparatus.
- the lattice period p between the adjacent convex portions 12 can be set to a different value for each portion.
- etching is performed using the resist pattern as a mask, and the resist pattern is removed, and the state shown in FIG. 3 is obtained.
- the state shown in FIG. 3 when the height h of some of the convex portions 12 is lowered, a mask that covers only the upper portions of the convex portions 12 that need not be lowered is created, and etching is performed.
- a titanium oxide metal film 13 is formed by vapor deposition so as to cover one surface of the substrate 11 including the protrusions 12.
- a mask that covers only the portion that is not thinned is created, and then etching is performed.
- the filter member 1 is completed through the above steps.
- the photodetector 2 is arranged such that each of the plurality of light receiving elements 22 receives the light transmitted through the filter member 1. For this reason, the transmitted light is received and detected by the different light receiving elements 22 for each part of the filter member 1.
- the photodetector 2 is a solid-state imaging device having a semiconductor substrate 21 in which a plurality of light receiving elements 22 are formed in a matrix, for example, a CCD (Charge-Coupled Device) imaging device or a MOS-type imaging device. Preferably there is.
- a solid-state imaging device When a solid-state imaging device is used, a plurality of light receiving elements 22 can be assigned to one part of the filter member, so that transmitted light can be reliably detected.
- the filter member 1 used in the present embodiment since the light transmitted by the fine diffraction grating can be selected, the transmission is made as compared with the filter members described in Patent Documents 1 and 2 above.
- the wavelength band can be narrowed. For this reason, according to the optical unit in this Embodiment, many light from which a wavelength differs can be detected, and the precision of spectrum analysis can be improved.
- the portions where the wavelengths of transmitted light are different from each other are manufactured integrally at a time, so that the filter member 1 is manufactured as compared with the filter members described in Patent Documents 1 and 2 above. Cost is also reduced. For this reason, it is possible to reduce the cost of the optical unit 10 in the present embodiment, and in turn, the spectrophotometer using the same.
- the optical unit 10 may further be an example shown in FIG.
- FIG. 6 is a cross-sectional view showing a schematic configuration of another example of the optical unit in the embodiment of the present invention.
- the optical unit 10 includes a slit member 4 and a collimator lens 5.
- the diffused light is converted into parallel light by the collimator lens 5. Only light that has passed through the slit member 4 out of the parallel light is incident on the filter member 1.
- the example shown in FIG. 6 is adopted in the optical unit 10, the light from the object can be efficiently incident on the filter member 1, so that the accuracy of light detection using the optical unit 10 can be improved.
- the optical unit in the present invention has the following characteristics.
- a filter member for dispersing transmitted light, and a photodetector having a plurality of light receiving elements includes a light-transmitting substrate, a plurality of protrusions formed of a first metal material on one surface of the substrate, and a second refractive index higher than that of the first metal material.
- the plurality of convex portions are arranged such that the metal film existing between adjacent convex portions serves as a diffraction grating, and the convex portions serve as a waveguide, At least one of the grating period of the diffraction grating, the height of the convex part, and the thickness of the metal film is different for each part so that the wavelength of light transmitted through the filter member changes for each part.
- the photodetector is a solid-state imaging device having a semiconductor substrate in which a plurality of light receiving elements are formed in a matrix.
- the present invention it is possible to provide an optical unit capable of detecting a large number of lights having different wavelengths at a low cost.
- the present invention is useful for an apparatus that performs spectral analysis on transmitted light or reflected light from an object.
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Abstract
Description
前記フィルタ部材は、光透過性を有する基板と、前記基板の一方の面上に第1の金属材料で形成された複数の凸部と、前記第1の金属材料よりも屈折率の高い第2の金属材料によって、前記複数の凸部と共に前記基板の前記一方の面を覆うように形成された金属膜とを備え、
前記複数の凸部は、隣り合う凸部間に存在する前記金属膜が回折格子となり、前記凸部が導波路となるように配置され、
前記回折格子の格子周期、前記凸部の高さ、及び前記金属膜の厚みの少なくとも一つは、前記フィルタ部材を透過する光の波長が部分毎に変化するように、前記部分毎に異なる値に設定され、
前記光検出器は、前記複数の受光素子それぞれが、前記フィルタ部材を透過する光を前記部分毎に受光するように配置されている、ことを特徴とする。
以下、本発明の実施の形態における光学ユニットについて、図1~図6を参照しながら説明する。最初に、図1~図3を用いて、本実施の形態における光学ユニットの構成について説明する。
前記フィルタ部材は、光透過性を有する基板と、前記基板の一方の面上に第1の金属材料で形成された複数の凸部と、前記第1の金属材料よりも屈折率の高い第2の金属材料によって、前記複数の凸部と共に前記基板の前記一方の面を覆うように形成された金属膜とを備え、
前記複数の凸部は、隣り合う凸部間に存在する前記金属膜が回折格子となり、前記凸部が導波路となるように配置され、
前記回折格子の格子周期、前記凸部の高さ、及び前記金属膜の厚みの少なくとも一つは、前記フィルタ部材を透過する光の波長が部分毎に変化するように、前記部分毎に異なる値に設定され、
前記光検出器は、前記複数の受光素子それぞれが、前記フィルタ部材を透過する光を受光するように配置されている、ことを特徴とする光学ユニット。
2 光検出器
3 基盤
4 スリット部材
5 コリメータレンズ
10 光学ユニット
11 基板
12 凸部
13 金属膜
14 導波路
15 回折格子
21 半導体基板
22 受光素子
Claims (5)
- 透過する光を分光するフィルタ部材と、複数の受光素子を有する光検出器とを備え、
前記フィルタ部材は、光透過性を有する基板と、前記基板の一方の面上に第1の金属材料で形成された複数の凸部と、前記第1の金属材料よりも屈折率の高い第2の金属材料によって、前記複数の凸部と共に前記基板の前記一方の面を覆うように形成された金属膜とを備え、
前記複数の凸部は、隣り合う凸部間に存在する前記金属膜が回折格子となり、前記凸部が導波路となるように配置され、
前記回折格子の格子周期、前記凸部の高さ、及び前記金属膜の厚みの少なくとも一つは、前記フィルタ部材を透過する光の波長が部分毎に変化するように、前記部分毎に異なる値に設定され、
前記光検出器は、前記複数の受光素子それぞれが、前記フィルタ部材を透過する光を受光するように配置されている、ことを特徴とする光学ユニット。 - 前記回折格子の格子周期が、前記部分毎に、当該部分において透過することが求められている光の波長よりも短くなるように形成されている、請求項1に記載の光学ユニット。
- 前記基板の形成材料が酸化シリコンを含み、前記第1の金属材料が金(Au)を含み、前記第2の金属材料が酸化チタンを含む、請求項1または2に記載の光学ユニット。
- 前記複数の凸部が、角柱状に形成され、且つ、マトリクス状に配置されている、請求項1~3のいずれかに記載の光学ユニット。
- 前記光検出器が、複数の受光素子がマトリクス状に形成された半導体基板を有する固体撮像装置である、請求項1~4のいずれかに記載の光学ユニット。
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KR1020127004913A KR20120088654A (ko) | 2009-08-25 | 2010-07-28 | 광학 유닛 |
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KR20160142426A (ko) * | 2015-06-02 | 2016-12-13 | 고려대학교 산학협력단 | 광학 필터링 유닛 및 이를 포함하는 분광 장치 |
TWI541493B (zh) * | 2015-09-01 | 2016-07-11 | 國立交通大學 | 一種分光器及其光譜儀 |
CN108458785A (zh) * | 2018-01-31 | 2018-08-28 | 云谷(固安)科技有限公司 | 光谱检测组件及其制备方法、光谱仪 |
FR3084459B1 (fr) * | 2018-07-30 | 2020-07-10 | Silios Technologies | Capteur d'imagerie multispectrale pourvu de moyens de limitation de la diaphonie |
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JP2011047693A (ja) | 2011-03-10 |
KR20120088654A (ko) | 2012-08-08 |
US20120147373A1 (en) | 2012-06-14 |
EP2472239A4 (en) | 2017-11-22 |
US8570510B2 (en) | 2013-10-29 |
EP2472239A1 (en) | 2012-07-04 |
CN102498374A (zh) | 2012-06-13 |
CN102498374B (zh) | 2015-02-18 |
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