WO2004086107A1 - 光学フィルタ及び光学機器 - Google Patents
光学フィルタ及び光学機器 Download PDFInfo
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- WO2004086107A1 WO2004086107A1 PCT/JP2004/003975 JP2004003975W WO2004086107A1 WO 2004086107 A1 WO2004086107 A1 WO 2004086107A1 JP 2004003975 W JP2004003975 W JP 2004003975W WO 2004086107 A1 WO2004086107 A1 WO 2004086107A1
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- Prior art keywords
- refractive index
- layer
- laminated portion
- low
- index layer
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- 230000003287 optical effect Effects 0.000 title claims abstract description 70
- 239000000758 substrate Substances 0.000 claims abstract description 57
- 239000010409 thin film Substances 0.000 claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims description 35
- 239000012788 optical film Substances 0.000 claims description 19
- 230000007423 decrease Effects 0.000 claims description 8
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 33
- 238000010521 absorption reaction Methods 0.000 description 28
- 230000003595 spectral effect Effects 0.000 description 24
- 230000005284 excitation Effects 0.000 description 13
- 238000004088 simulation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/285—Interference filters comprising deposited thin solid films
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/16—Microscopes adapted for ultraviolet illumination ; Fluorescence microscopes
Definitions
- the present invention relates to an optical filter and an optical device. This application is based on Japanese Patent Application No. 2003-0884984 and Japanese Patent Application No. 2003-22993
- a fluorescence microscope which is an optical instrument used for observing a biological sample, analyzes the structure and properties of the sample by observing the fluorescence emitted by the sample when excitation light is applied to the sample such as stained cells.
- the optical filter that cuts the excitation light in the stop band to efficiently detect the fluorescence and transmits the light of the fluorescence observation wavelength in the transmission band is used for the fluorescence. It is used as a very important key part in determining the sensitivity and accuracy of measurement.
- This optical filter is required to have a sharp rise in spectral characteristics at the boundary between the transmission band and the stop band, and to transmit approximately 100% of light in the transmission band. Furthermore, it is desirable that there is no periodic fluctuation (ripple) of the transmittance with respect to the increase or decrease of the wavelength in the transmission band.
- the minus filter which is an optical filter that blocks light in a predetermined wavelength band and transmits light of other wavelengths, has a high-refractive-index layer and a low-refractive-index layer on a substrate, as shown in Figure 1OA.
- Figure 1OA are alternately laminated to produce a multilayer film.
- the horizontal axis represents the optical film thickness
- the vertical axis represents the refractive index of the film.
- FIG. 1OB shows the relationship between the wavelength of light passing through the film and the transmittance when the film is configured as spectral characteristics.
- the optical filter has a higher boundary between the transmission band and the stop band.
- the rise can be steep.
- a film design that reduces the ripple by changing the optical film thickness of each layer is also possible.
- FIG. 11B shows a case where the ripple is reduced.
- Non-Patent Document 1 WH Southwell, Using Apodization Function to Reduce Sidelobes in Rugate Filters, Appl. Opt., Vol. 28 (1989) P. 5091 -5094 ").
- a continuous refractive index distribution is approximated by dividing it stepwise, or the refractive index of the high refractive index layer and the low refractive index layer in the middle part of the period are constant.
- An optical filter of the present invention is an optical filter comprising a substrate and a thin film formed on the substrate, wherein the thin film is a low refractive index layer alternately stacked from the substrate side, and the low refractive index layer.
- a high-refractive-index layer having a higher refractive index than the refractive-index layer and further comprising: a first laminated portion in which the refractive index of the high-refractive-index layer changes gradually higher from the substrate side; A second laminated portion which is adjacent to the laminated portion and whose refractive index of the high refractive index layer is substantially the same as the highest refractive index among the high refractive index layers constituting the first laminated portion; A third laminated portion adjacent to the second laminated portion, wherein a refractive index of the high refractive index layer gradually decreases from the side of the second laminated portion; and a third laminated portion is formed from the first laminated portion.
- the high-refractive-index-variable layer section may be inserted at a boundary between the second laminated section and the first laminated section or the third laminated section, or in the vicinity thereof.
- the refractive index of the low refractive index layer may be substantially the same as the refractive index of the substrate.
- the optics of the high refractive index layer, the low refractive index layer, and the high refractive index variable layer portion may be set to about nZ 4 times the design wavelength.
- the optical film thickness of at least one layer constituting the initial region adjacent to the substrate and the final region on the opposite side of the thin film may be set to approximately n / 2 times the design wavelength.
- An optical filter according to the present invention is an optical filter comprising a substrate and a thin film formed on the substrate, wherein the thin film comprises a low refractive index layer alternately stacked from the substrate side, and a low refractive index layer.
- a high-refractive-index layer having a higher refractive index than the refractive-index layer further comprising: a first laminated portion in which the refractive index of the high-refractive-index layer changes gradually higher from the substrate side; A second laminated portion adjacent to the laminated portion, wherein the high refractive index layer has a refractive index substantially equal to the highest refractive index among the high refractive index layers constituting the first laminated portion; A third laminated portion adjacent to the second laminated portion, wherein the refractive index of the high-refractive-index layer changes gradually from the second laminated portion to the third laminated portion, and the third laminated portion is formed from the first laminated portion to the third laminated portion.
- the refractive index of the low refractive index layer is adjacent to at least one of the laminated portions via the high refractive index layer.
- a low-refractive-index variable layer portion that is set higher than the other low-refractive-index layers on both sides in contact is inserted.
- the refractive index of the high refractive index layer may be substantially the same as the refractive index of the substrate.
- An optical filter according to the present invention is an optical filter comprising a substrate and a thin film formed on the substrate, wherein the thin film comprises a low refractive index layer alternately stacked from the substrate side, and a low refractive index layer.
- the refractive index of the high-refractive-index layer gradually increases from the substrate side, and the refractive index of the low-refractive-index layer A first laminated portion that changes gradually from the substrate side, and a first refractive index of the high refractive index layer adjacent to the first laminated portion.
- the refractive index of the low refractive index layer is substantially the same as the highest refractive index of the constituent high refractive index layers, and the refractive index of the low refractive index layer is substantially equal to the lowest refractive index of the low refractive index layers of the first laminated portion.
- At least one of the high-refractive-index variable layer portion and the low-refractive-index variable layer portion is provided at a boundary between the second laminated portion and the first laminated portion or the third laminated portion, or in the vicinity thereof. May be inserted.
- the high refractive index layer, the low refractive index layer, the high refractive index variable layer portion, and The optical film thickness of the low refractive index variable layer may be set to approximately n / 4 times the design wavelength.
- the optical film thickness of at least one layer constituting the initial region adjacent to the substrate and the final region on the opposite side of the thin film may be set to approximately n / 2 times the design wavelength.
- An optical device includes the optical filter. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a diagram showing an outline of a fluorescence microscope which is a first embodiment of an optical device provided with the optical filter of the present invention.
- FIGS. 2A and 2B are graphs showing the film configuration and spectral characteristics of an absorption filter which is an optical filter provided in the fluorescence microscope.
- FIG. 3 is a graph showing the relationship between wavelength and transmittance in the same fluorescence microscope.
- FIGS. 4A and 4B show an absorption filter according to a second embodiment of the present invention.
- 6 is a graph showing the film configuration and spectral characteristics of the laser.
- 5A and 5B are graphs showing a film configuration and spectral characteristics of an absorption filter which is a third embodiment of the optical filter of the present invention.
- FIGS. 6A and 6B are diagrams showing another example of the first embodiment, and are graphs showing the film configuration and spectral characteristics 4 of the absorption filter.
- 7A and 7B are diagrams showing another example of the first embodiment, and are graphs showing the film configuration and the spectral characteristics 14 of the absorption filter.
- FIGS. 8A and 8B are diagrams showing another example of the third embodiment, and are graphs showing the film configuration and the spectral characteristics of the absorption filter.
- 9A and 9B are diagrams showing another example of the third embodiment, and are graphs showing the film configuration and the spectral characteristics of the absorption filter.
- FIGS. 10A and 10B are graphs showing the film configuration and spectral characteristics of a conventional absorption filter.
- FIGS. 11A and 11B are graphs showing the film configuration and spectral characteristics of a conventional absorption filter.
- FIGS. 12A and 12B are graphs showing the film configuration and spectral characteristics of the conventional absorption filter described in Non-Patent Document 1.
- FIGS. 13A and 13B are graphs showing the film configuration and spectral characteristics of a conventional absorption filter.
- FIG. 14A and FIG. 14B are rough graphs showing the film configuration and spectral characteristics of another embodiment of the absorption filter which is the optical filter of the present invention.
- FIGS. 15A and 15B are graphs showing a film configuration and spectral characteristics in another embodiment of the absorption filter which is the optical filter of the present invention.
- FIG. 16A and FIG. 16B are graphs showing a film configuration and spectral characteristics in another embodiment of the absorption filter which is the optical filter of the present invention.
- the fluorescence microscope (optical device) 10 of the present embodiment 1, a dichroic mirror 12, an absorption filter (optical filter) 13, an eyepiece 14, and an objective lens 15.
- the excitation filter 11 is disposed on the optical path of the light source 16 so as to selectively transmit only a specific wavelength of the light generated from the light source 16 as excitation light.
- the dichroic mirror 12 is a semi-transmissive mirror, which changes the optical path so that the optical path of the light transmitted through the excitation filter 11 is radiated onto a placed specimen 17 such as a living cell. However, it is set so that the fluorescence generated from the sample 17 by this irradiation is transmitted to the observation side.
- the eyepiece lens 14 and the objective lens 15 are arranged so that the fluorescence can be observed.
- the absorption filter 13 is composed of a glass substrate 18, a thin film 19 formed on the substrate 18, and an incident side medium 18 A provided on the thin film 19. Only selective transmission.
- the incident side medium 18 A is composed of a member (for example, a glass plate) having the same refractive index as the substrate 18.
- the thin film 19 is composed of a low refractive index layer 20 having a relatively low refractive index and a high refractive index layer 21 having a relatively high refractive index alternately from the substrate 18 side.
- the second laminated portion 23 whose refractive index is substantially the same as the highest refractive index among the high refractive index layers 21 constituting the first laminated portion 22 and the second laminated portion 23
- substantially the same means that the refractive indices are completely the same, or that the variation in the refractive index is in the range of 0.2 or less.
- the low refractive index layer 20 is mainly composed of silicon oxide, and the high refractive index layer 21 is mainly composed of niobium oxide.
- the refractive index of the substrate 18 and the incident side medium 18 A is 1.52
- the refractive index of the high refractive index layer 21 is changed from 1.98 to 2.3
- the low refractive index is changed.
- the refractive index of the refractive index layer 20 is set to a constant value of 1.72.
- the thin film 19 has a high refractive index variable layer portion in which the refractive index of the high refractive index layer 21 is set lower than that of the other high refractive index layers 21 adjacent on both sides via the low refractive index layer 20.
- 2 5 is the first One layer is completely inserted in the laminated portion 22 and the third laminated portion 24 and at the boundary with the second laminated portion 23.
- the refractive index of the high refractive index layer 21 in the second laminated portion 23 is the same as the highest refractive index of the high refractive index layer 21 in the first laminated portion 22.
- the refractive index of the high refractive index variable layer portion 25 is set to 2.2.
- the optical film thickness of the refractive index layer 20 is set to 1 ⁇ 4 times the design wavelength, and the initial area 26 adjacent to the substrate 18 and the final area adjacent to the incident medium 18 on the opposite side
- the optical film thickness of each one layer constituting 27 is set to be 1 to 2 times the design wavelength.
- the optical film thicknesses are 150 nm and 300 nm, respectively.
- FIG. 2B shows the result of simulation assuming that the total number of layers is 45 layers and that there is no refractive index dispersion of each layer from the initial region 26 to the final region 27 of the thin film 19.
- light emitted from the light source 16 passes through the excitation filter 11 to become excitation light of a specific wavelength, and is then projected on the dichroic mirror 12.
- the excitation light has its optical path bent by the dichroic mirror 12, is condensed by the objective lens 15, and irradiates the specimen 17. This irradiation causes fluorescence from the specimen 17. Fluorescence becomes parallel light through the objective lens 1 5, it reaches the dichroic mirror 1 2, leading to the absorption filter 1 3 and further transmitted therethrough.
- the fluorescent light that reaches the absorption filter 13 enters from the incident side medium 18A side and passes through the third laminated section 24, the second laminated section 23, and the first laminated section 22 shown in FIG. 2A. After transmission, the light is again emitted to the outside from the substrate 18 shown in FIG.
- Excitation light having a wavelength other than the fluorescence is also mixed and incident on the absorption filter 13.
- the absorption filter 13 emits light in the stop band 28 which is a wavelength band to which the excitation light or the like belongs. While preventing light from being emitted to the outside, while transmitting light in a transmission band 29, which is a wavelength band to which the fluorescence belongs.
- the high refractive index variable layer portion 25 is inserted, and the optical film thicknesses of the high refractive index layer 21 and the low refractive index layer 20 are set to ⁇ times the design wavelength. Therefore, the transmitted light has stable optical characteristics due to good film thickness controllability during film formation.
- each layer constituting the initial region 26 and the opposite final region 27 since the optical thickness of each layer constituting the initial region 26 and the opposite final region 27 is set to / times the design wavelength, it transmits at the wavelength for which fluorescence is to be detected. The rate ripple is suppressed.
- the fluorescence emitted from the absorption filter 13 passes through the eyepiece 14 and is collected, and reaches the observation side.
- the absorption filter 13 for example, as shown in FIG. 2B, the rise of the spectral characteristic at the boundary between the stop band 28 and the transmission band 29 is sharp, and the ripple 29 9 in the transmission band 29. a can be almost completely suppressed.
- the film configuration is easy to control during film formation, the stability of optical characteristics can be improved.
- the absorption filter 13 has optical characteristics close to the ideal filter shown in FIG. Light can be transmitted without reducing the amount of light (the part where the amount of light increases). As a result, the detection sensitivity in fluorescence measurement can be significantly improved, and the analysis accuracy, detection accuracy, and observation time in genome analysis and the like can be reduced.
- the difference between the present embodiment and the first embodiment is that, in the thin film 30 of the present embodiment, the refractive indices of the low refractive index layers 20 forming the first laminated portion 22 and the third laminated portion 24 are different.
- the low refractive index variable layer portion 31 is introduced instead of the high refractive index variable layer portion 25.
- the thin film 30 is formed so that the refractive index of the low refractive index layer 20 constituting the first laminated portion 22 gradually changes from the substrate 18 side to the second laminated portion 23.
- the low refractive index layer 20 is formed so that the refractive index of the low refractive index layer 20 is substantially the same as the lowest refractive index of the low refractive index layers 20 forming the first laminated portion 22, and forms the third laminated portion 24. Is formed so that the refractive index of the low refractive index layer 20 changes gradually from the second laminated portion 23 side. You.
- the low refractive index layer 20 has a refractive index adjacent to the boundary between the second laminated portion 23 and the first laminated portion 22 and the third laminated portion 24 via the high refractive index layer 21.
- One low-refractive-index variable layer portion 31 set higher than the low-refractive-index layers 20 on both sides is inserted.
- the refractive index of the low refractive index layer 20 in the first laminated portion 22 is changed from 1.5 to 1.72,
- the refractive index of the low-refractive-index layer 20 in the section 23 is set to 1.5, which is the same as the lowest refractive index of the low-refractive-index layers 20 in the first laminated section 22.
- the refractive index of 3 1 is set to 1.5 3.
- FIG. 4B shows a simulation result obtained by assuming that the total number of layers is 45 layers and that there is no refractive index dispersion of each layer from the initial region 26 to the final region 27.
- the ripple 29a in the transmission band of the fluorescence is reduced similarly to the first embodiment, and a sufficient amount of light is stabilized. Can be obtained.
- This embodiment is different from the second embodiment in that a high refractive index variable layer portion 25 is inserted into the thin film 32.
- the thin film 32 has a high refractive index variable layer portion in which the refractive index of the high refractive index layer 21 is set lower than that of the other high refractive index layers 21 adjacent on both sides via the low refractive index layer 20.
- 2 5 is within the first laminated portion 22 and at the boundary with the second laminated portion 23, and within the third laminated portion 24 and at the boundary with the second laminated portion 23. There is one layer at the boundary.
- the low refractive index layer 20 has a high refractive index layer 21 at the boundary between the first multilayer section 22 and the third multilayer section 24 within the second multilayer section 23.
- the low-refractive-index variable layer portion 31 which is set higher than the low-refractive-index layers 20 on both sides adjacent to each other, is inserted into the S1 layer.
- the refractive indices of the low refractive index layer 20 and the high refractive index layer 21 are changed in the same manner as in each of the above embodiments, and the high refractive index fluctuation is achieved.
- the refractive indices of the layer 25 and the low refractive index variable layer 31 are set to the same values as in the above embodiments.
- Fig. 5B shows the result of simulation assuming that the total number of layers is 45 layers and that there is no refractive index dispersion in each layer from the initial region 26 to the final region 27.
- the ripple of the fluorescence in the transmission band is more effectively suppressed, and a sufficient amount of light is stably provided. Can be obtained.
- the optical film thickness of each layer constituting the initial region 26 and the final region 27 on the opposite side is set to twice, that is, 1 ⁇ 2.
- the optical film thickness of the high refractive index layer 21 and the low refractive index layer 20 is set to 1Z times the design wavelength, and the initial region 26 and its Even if the thin film 32 is formed by setting the optical thickness of each layer constituting the final region 27 on the opposite side to 11 times, which is twice that of the one layer, the same spectral characteristics as those in FIG. An absorption filter can be obtained.
- the design wavelength is set to 60 ⁇ ⁇ ⁇ ( ⁇ is an integer) ⁇ m
- the optical film thickness of the high refractive index layer 21 and the low refractive index layer 20 is set to the design wavelength.
- n Z is quadrupled, and the optical film thickness of each layer constituting the initial region 26 and the final region 27 on the opposite side is set to n / 2 times, which is twice as large, to form a thin film.
- the technical scope of the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention.
- the low refractive index layer A thin film 33 whose refractive index gradually changes may be employed.
- the high refractive index variable layer portion 25 is inside the second laminated portion 23 and the first laminated portion 22 A thin film 34 inserted one layer at a time near the boundary with the third laminated portion 24 may be employed.
- the same operation and effect as in the first embodiment can be obtained as shown in FIGS. 6B and 7B as a simulation result using each thin film.
- a high refractive index variable layer portion 25 is inserted one layer at a time into the first laminated portion 22 and the third laminated portion 24.
- a thin film 35 may be used.
- Figure 8B shows the result of a similar simulation. According to the thin film 35, ripples can be suppressed more than in the first embodiment.
- a thin film 36 in which the optical thicknesses of the high refractive index layer 21 and the low refractive index layer 20 are all set to 1 to 4 times the design wavelength is adopted. You can.
- Fig. 9B shows the result of a similar simulation. Also in this thin film 36, the ripple 29a can be reduced.
- the design wavelength is set to 600 / n (n is an integer) nm with respect to the center wavelength of 600 nm, and the optical film thickness of the high refractive index layer 21 and the low refractive index layer 20 is set to the design wavelength. Even if a thin film is formed at n / 4 times the above value, an absorption filter having exactly the same spectral characteristics as in FIG. 9B can be obtained.
- the refractive index of the low refractive index layer 20 is lower than that of the substrate 18.
- the refractive index is set to a constant value of 1.8, which is the same as the refractive index, and is gradually increased so that the refractive index of the high refractive index layer 21 in the first laminated portion 22 gradually increases from 1.82 to 2.2.
- the refractive index of the high refractive index layer 21 in the third laminated portion 24 may be changed so that the refractive index gradually changes from 2.2 to 1.82 so as to gradually decrease. .
- the high refractive index variable layer portion 25 having a refractive index of 2.12 is located within the first laminated portion 22 and between the boundary with the second laminated portion 23 and the third laminated portion 23.
- One layer is completely inserted in the section 24 and at the boundary with the second laminated section 23.
- Fig. 14B shows the results of 12 erasures.
- this thin film 37 can also obtain the same operation and effect as in the first embodiment, and can suppress ripple. Further, it is possible to sufficiently prevent transmission of light in the P band and to transmit light in the transmission band more favorably.
- the refractive index of the low refractive index layer 20 is the same as that of the substrate 18.
- the rate of change of the refractive index of the high refractive index layer 21 in the first laminated portion 22 changes linearly and high from 1.6 to 2.3, and the high refractive index layer in the third laminated portion 24 It is also possible to adopt a material whose refractive index changes linearly and slowly from 2.3 to 1.6.
- the high-refractive-index variable layer portion 25 having a refractive index of 2.18 is placed inside the first laminated portion 22 and the boundary between the second laminated portion 23 and the third laminated portion 24.
- FIG. 15B shows the result of simulation assuming that there is no refractive index dispersion of each layer from the initial region 26 to the final region 27.
- this thin film 38 can also obtain the same operation and effect as in the first embodiment, and can suppress ripple.
- the ripple can be suppressed in any case. Further, the loss between the substrate 18 and the thin film 38 can be reduced, and the light in the transmission band can be transmitted better.
- the refractive index of the substrate 18 forming the thin film 39 is 1.8
- the refractive index of the high refractive index layer 21 is the same as the refractive index of the substrate 18.
- the constant value of 1.8 is set, and the refractive index of the low refractive index layer 20 in the first laminated portion 22 is changed so that the rate of change linearly decreases from 1.76 to 1.4.
- the refractive index of the low refractive index layer 20 in 24 may be changed so that the change rate linearly increases from 1.4 to 1.76.
- the low-refractive-index variable layer portion 31 having a refractive index of 1.48 is P2004 / 003975
- Figure 16B shows the result of a simulation assuming that there is no refractive index dispersion in each layer from the initial region 26 to the final region 27.
- this thin film 39 can also obtain the same operation and effect as those of the other embodiments, and can suppress ripple. Further, the loss between the substrate 18 and the thin film 39 can be reduced, and the light in the transmission band can be transmitted well.
- the center wavelength (e) is not limited to 600 nm, and desired optical characteristics can be obtained by appropriately changing the value of ⁇ according to the wavelength of the excitation light or the wavelength of the fluorescence to be detected.
- the material of the substrate is not limited to glass, but may be plastic. Furthermore, a plurality of low refractive index variable layers 31 may be provided, and at least one high refractive index variable layer 25 and at least one low refractive index variable layer 31 may be inserted. However, the insertion position of the high refractive index variable layer portion 25 is at the boundary between the second laminated portion 23 and the first laminated portion 22 or the third laminated portion 24, or at a position near the boundary (for example, (Within 4 layers from the boundary) can obtain a better effect.
- Low refractive index layer 20 in first laminated section 22 refractive index change rate of high refractive index layer 21 in first laminated section 22, low refractive index layer 20 in third laminated section 24
- the rate of change of the refractive index of the high refractive index layer 21 in the third laminated portion 24 may be linear or curved, and the same operation and effect can be obtained. Can be. As described above, the present invention can provide the following effects.
- the filter characteristics when transmitting light, while blocking light corresponding to a stop band near a predetermined wavelength, and transmitting light in a transmission band corresponding to other wavelengths, the filter characteristics include: By steepening the boundary between the transmission band and the stop band, the amount of transmitted light can be increased, and ripples in the transmission band can be suppressed. That is, the first to third laminated portions, and the first to third laminated portions. Since at least the refractive index varying layer portion of the laminated portion of No. 3 is inserted, the rising of the spectral characteristic at the boundary between the stop band and the transmission band can be made steep. Ripple in the transmission band can be almost completely suppressed, and a high-performance filter characteristic with a clearer boundary between the transmission band and the stop band with a film configuration that allows easy control of the film thickness during film formation. Obtainable.
- the refractive index of the low-refractive-index layer is the same as the refractive index of the substrate, light can be sufficiently blocked in the stop band and the amount of transmitted light can be further increased in the transmission band.
- the optical thickness of the high refractive index layer, low refractive index layer, and high refractive index variable layer is set to approximately n / 4 times the design wavelength, the controllability of the film thickness in actual film formation is improved. As a result, stable optical characteristics can be obtained.
- the optical thickness of at least one layer in the initial region adjacent to the substrate and the final region on the opposite side is set to approximately n / 2 times the design wavelength, ripples in the transmission band are further suppressed. Spectral characteristics can be improved.
- the optical apparatus of the present invention includes an optical filter having a sharp boundary between the transmission band and the stop band even when the wavelength to be transmitted is close to the wavelength to block the transmission, so that the wavelength in the transmission band can be improved.
- the light can be transmitted efficiently without reducing the amount of light, and filter performance with excellent spectral characteristics can be exhibited.
- the provision of the optical filter of the present invention makes it possible to efficiently cut off unnecessary light during observation and to select light of a desired wavelength, thereby increasing the sensitivity of detecting light such as fluorescence. Can be improved.
- the present invention relates to an optical filter and an optical device.
- the optical filter of the present invention the first to third laminated portions and the refractive index variable layer portion inserted in at least one of the first to third laminated portions are provided.
- the rise of spectral characteristics at the boundary between the P-band and the transmission band can be made steep. Ripple in the transmission band can be almost completely suppressed, and film thickness can be easily controlled during film formation. Filter characteristics can be obtained.
- the optical device of the present invention since the optical device of the present invention includes the optical filter of the present invention, it is possible to efficiently select light having a desired wavelength by focusing unnecessary light upon observation.
- the detection sensitivity of light such as fluorescence can be improved more than before.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP04722695A EP1607772B1 (en) | 2003-03-26 | 2004-03-23 | Optical filter and optical apparatus |
DE602004015431T DE602004015431D1 (de) | 2003-03-26 | 2004-03-23 | Optisches filter und optische vorrichtung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003084984 | 2003-03-26 | ||
JP2003-84984 | 2003-03-26 | ||
JP2003299223A JP4331546B2 (ja) | 2003-03-26 | 2003-08-22 | 光学フィルタ及び光学機器 |
JP2003-299223 | 2003-08-22 |
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WO2004086107A1 true WO2004086107A1 (ja) | 2004-10-07 |
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US (1) | US6961183B2 (ja) |
EP (1) | EP1607772B1 (ja) |
JP (1) | JP4331546B2 (ja) |
DE (1) | DE602004015431D1 (ja) |
WO (1) | WO2004086107A1 (ja) |
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JP2006201450A (ja) * | 2005-01-20 | 2006-08-03 | Olympus Corp | 光学フィルタ及び光学機器 |
JP2006317678A (ja) * | 2005-05-12 | 2006-11-24 | Olympus Corp | 光学フィルタ及び光学機器 |
US7903338B1 (en) | 2006-07-08 | 2011-03-08 | Cirrex Systems Llc | Method and system for managing light at an optical interface |
US9513417B2 (en) | 2012-11-16 | 2016-12-06 | Canon Denshi Kabushiki Kaisha | Optical filter and optical apparatus |
JP6162947B2 (ja) * | 2012-11-16 | 2017-07-12 | キヤノン電子株式会社 | 光学フィルタ及び光学機器、電子機器 |
JP6224314B2 (ja) * | 2012-11-16 | 2017-11-01 | キヤノン電子株式会社 | 光学フィルタ及び光学機器 |
JP6506522B2 (ja) * | 2014-09-29 | 2019-04-24 | キヤノン株式会社 | 情報処理装置、その制御方法、及びプログラム |
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JP2000009928A (ja) * | 1998-06-22 | 2000-01-14 | Alps Electric Co Ltd | 光学多層膜フィルタ |
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JPS53107383A (en) * | 1977-02-28 | 1978-09-19 | Matsushita Electric Ind Co Ltd | Multicolor separation optical system |
US5559825A (en) * | 1995-04-25 | 1996-09-24 | The United States Of America As Represented By The Secretary Of The Army | Photonic band edge optical diode |
JP2002333519A (ja) * | 2001-05-09 | 2002-11-22 | Alps Electric Co Ltd | 光学フィルタ |
US7193780B2 (en) * | 2003-08-22 | 2007-03-20 | Olympus Corporation | Optical filter and optical instrument |
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2003
- 2003-08-22 JP JP2003299223A patent/JP4331546B2/ja not_active Expired - Fee Related
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2004
- 2004-03-23 DE DE602004015431T patent/DE602004015431D1/de not_active Expired - Lifetime
- 2004-03-23 EP EP04722695A patent/EP1607772B1/en not_active Expired - Fee Related
- 2004-03-23 WO PCT/JP2004/003975 patent/WO2004086107A1/ja active IP Right Grant
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JP2000009928A (ja) * | 1998-06-22 | 2000-01-14 | Alps Electric Co Ltd | 光学多層膜フィルタ |
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SOUTHWELL W H: "Using apodization functions to reduce sidelobes in rugate filters", APPLIED OPTICS, vol. 28, no. 23, 1 December 1989 (1989-12-01), pages 5091 - 5094, XP000081084 * |
Also Published As
Publication number | Publication date |
---|---|
EP1607772B1 (en) | 2008-07-30 |
EP1607772A1 (en) | 2005-12-21 |
JP2004310008A (ja) | 2004-11-04 |
EP1607772A4 (en) | 2006-09-06 |
DE602004015431D1 (de) | 2008-09-11 |
US20050012999A1 (en) | 2005-01-20 |
US6961183B2 (en) | 2005-11-01 |
JP4331546B2 (ja) | 2009-09-16 |
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