WO2001059415A1 - Short fabry-perot filter with metallic layers - Google Patents
Short fabry-perot filter with metallic layers Download PDFInfo
- Publication number
- WO2001059415A1 WO2001059415A1 PCT/FR2001/000343 FR0100343W WO0159415A1 WO 2001059415 A1 WO2001059415 A1 WO 2001059415A1 FR 0100343 W FR0100343 W FR 0100343W WO 0159415 A1 WO0159415 A1 WO 0159415A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plates
- optical filter
- wavelength
- thickness
- tunable optical
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 125000006850 spacer group Chemical group 0.000 claims abstract description 15
- 229910052737 gold Inorganic materials 0.000 claims abstract description 7
- 239000010931 gold Substances 0.000 claims abstract description 7
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 7
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 3
- 238000001228 spectrum Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005459 micromachining Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 235000012431 wafers Nutrition 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- G01J3/26—Generating the spectrum; Monochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters
Definitions
- the invention relates to n tunable optical filter of the short Fabry-Perot interferometer type with metallic layers.
- Fabry-Perot interferometers comprising two partially transparent metallic layers separated by an air gap and manufactured by well-known techniques of photolitography, doping and micro-machining on silicon.
- Fabry-Pérot interferometer makes it possible to obtain an optical effect of the pass filter type.
- -band that is to say a differential attenuation as a function of the wavelength of the light passing through the facing layers.
- Bandpass filters have two important characteristic g-waveformers, the maximum transmission over a given wavelength range, and the half-width defined as the difference between the wavelengths for which the filter transmission is halved from the maximum transmission.
- the application of a voltage between the metal layers makes it possible, by a capacitive effect, to bring the metal layers closer or further apart from one another and therefore to modify the wavelength range over which the transmission is maximum, thereby obtaining a tunable bandpass optical filter.
- the absorption and the reflection coefficient of the facing metal layers directly influence the maximum transmission and the width at half height of the filter.
- filters with maximum high transmission for low-reflection, low-thickness and weakly absorbent metal layers and filters of small width at mid-height for high-reflection, high thickness and high absorption coefficient metal layers are filters with maximum high transmission for low-reflection, low-thickness and weakly absorbent metal layers and filters of small width at mid-height for high-reflection, high thickness and high absorption coefficient metal layers.
- the technical problem underlying the invention is therefore to design a tunable optical filter of the short Fabry-Perot interferometer type with metal layers, manufactured by a micromachining technique on silicon having a maximum acceptable transmission, for example greater than 1%, and a low half-height width, for example less than 80 nm, for a wavelength between 1.55 ⁇ m and 1.85 ⁇ m.
- a tunable optical filter of the short Fabry-Perot interferometer type with metal layers intended to filter electromagnetic radiation passing through it in a transverse direction ZZ ′ and whose wavelength spectrum is centered on a wavelength ⁇ o
- the filter being characterized in that to obtain maximum transmission Tmax greater than 1% and a width at half height ⁇ less than SOn in the wavelength range between 1.55 ⁇ m and 1.85 ⁇ m centered on the wavelength ⁇ o substantially equal to 1.7 ⁇ m, the metal layers are made of a metal selected from the group of materials including Tantalum and Gold.
- Figures A, lB and lC show different embodiments of the structure of the tunable optical filter of the type Fabry-Perot short metal layers according to the invention
- FIG. 2 represents the transmission curve of said filter as a function of the wavelength for Tantalum
- Figure 3 shows the transmission curve of said filter as a function of the wavelength for Gold.
- Figure 4 shows the transmission curve of said filter as a function of the wavelength for Nickel.
- the tunable optical filter 1 is a short Fabry-Perot interferometer with metallic layers.
- This interferometer acts as an optical bandpass filter centered around the wavelength ⁇ o.
- This interferometer is manufactured by well known techniques of micro-machining on silicon.
- the filter comprises two parallel plates 2, 4 separated from each other by means of at least one spacer 3.
- the two parallel plates are for example composed of two silicon wafers ("wafer" in English) whose thickness has been reduced or not by a chemical etching technique. It is however possible to use another material for the production of these plates.
- any material which can serve as a substrate is suitable, mention may be made, for example, of glass, silicon nitride, or else III-V-InP.
- the lower 2 and upper 4 plates have been etched on a central surface and have a thickness equal to a few micrometers.
- the spacer determines the thickness of an air gap 5 existing between the two parallel plates 2, 4.
- the spacer can be chosen so that the air gap 5 has a thickness e substantially equal to the wavelength ⁇ o, for example 1.7 ⁇ m ⁇ 250nm.
- the spacer 3 is for example constituted by a ring of insulating material, such as silicon oxide or pyrex.
- the faces of the two facing plates receive respectively a lower metallic layer 6 and an upper 7.
- the metallic layers have a thickness of between 5 and 200 nm.
- An electrical connection 8, 9 is made respectively with the lower plate 2 and upper 4.
- Va a voltage
- this voltage also applies between the metal layers 6, 7.
- the average value of the applied voltage is around 5 Volts. This induces a modification of the wavelength range over which the transmission is maximum, thus making it possible to obtain a tunable bandpass optical filter.
- the lower plate 2 has been engraved on a central surface and has a thickness equal to a few micrometers.
- the upper plate which has a thickness of the order of 300 ⁇ m has been engraved and drilled on a small surface in order to be able to establish an electrical connection 8 directly with the lower metal layer 6, so that the two connections are accessible by a single of the optical filter faces.
- the optical filter comprises two parallel plates 12, 14 separated from each other by means of at least one spacer 10.
- the two plates parallels are for example composed of two silicon wafers with a thickness between a few micrometers and several hundreds of micrometers, for example between l ⁇ m and 300 ⁇ m.
- the central surfaces of the two plates 12, 14 lying opposite each other receive a lower metal layer 6 and an upper layer 7.
- the metal layers have a thickness of between 5 and 200 nm.
- the spacer 10 determines the thickness of an air gap 5 existing between the two parallel plates 12, 14.
- the spacer can be chosen so that the air gap 5 has a thickness e substantially equal to the wavelength ⁇ o, for example L7 ⁇ m.
- the spacer 10 is for example a ring made of piezoelectric material, and comprises two metallized faces, 19 between which a voltage Va is applied.
- a voltage Va is applied.
- the average value of the applied voltage is of the order of 5 volts. This induces a modification of the wavelength range over which the transmission is maximum, thus making it possible to obtain a tunable bandpass optical filter.
- the Applicant has noted an important and unexpected advantage when the choice of materials constituting the metal layer used for all of the embodiments described above relates to Tantalum or Gold. By way of comparison, the choice of a metal such as Nickel, Platinum or any other metal does not give rise to such results.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01907709A EP1255971A1 (en) | 2000-02-14 | 2001-02-06 | Short fabry-perot filter with metallic layers |
AU2001235612A AU2001235612A1 (en) | 2000-02-14 | 2001-02-06 | Short fabry-perot filter with metallic layers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001871A FR2805052A1 (en) | 2000-02-14 | 2000-02-14 | FABRY-PEROT FILTER WITH METALLIC LAYERS |
FR00/01871 | 2000-02-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001059415A1 true WO2001059415A1 (en) | 2001-08-16 |
Family
ID=8847027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/000343 WO2001059415A1 (en) | 2000-02-14 | 2001-02-06 | Short fabry-perot filter with metallic layers |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1255971A1 (en) |
AU (1) | AU2001235612A1 (en) |
FR (1) | FR2805052A1 (en) |
WO (1) | WO2001059415A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100472201C (en) * | 2005-12-27 | 2009-03-25 | 中国科学院物理研究所 | Sensing unit having both interaction effect and plasma oscillation effect and uses thereof |
CN109884837A (en) * | 2019-04-26 | 2019-06-14 | 昆山锐芯微电子有限公司 | Lightwave filter |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5381232A (en) * | 1992-05-19 | 1995-01-10 | Akzo Nobel N.V. | Fabry-perot with device mirrors including a dielectric coating outside the resonant cavity |
DE4334578A1 (en) * | 1993-10-11 | 1995-04-20 | Dirk Winfried Dipl In Rossberg | Spectrally tunable IR-sensor |
EP0668490A2 (en) * | 1994-02-17 | 1995-08-23 | Vaisala Oy | Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis |
EP0693683A1 (en) * | 1994-07-07 | 1996-01-24 | Vaisala Oy | Selective infrared detector |
US5584117A (en) * | 1995-12-11 | 1996-12-17 | Industrial Technology Research Institute | Method of making an interferometer-based bolometer |
EP0903565A1 (en) * | 1997-09-19 | 1999-03-24 | Commissariat A L'energie Atomique | Integrated tunable Fabry-Pérot interferometer |
US5920391A (en) * | 1995-10-27 | 1999-07-06 | Schlumberger Industries, S.A. | Tunable Fabry-Perot filter for determining gas concentration |
EP0930481A2 (en) * | 1995-06-07 | 1999-07-21 | Northrop Grumman Corporation | Interferometer |
-
2000
- 2000-02-14 FR FR0001871A patent/FR2805052A1/en active Pending
-
2001
- 2001-02-06 EP EP01907709A patent/EP1255971A1/en not_active Withdrawn
- 2001-02-06 AU AU2001235612A patent/AU2001235612A1/en not_active Abandoned
- 2001-02-06 WO PCT/FR2001/000343 patent/WO2001059415A1/en not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5381232A (en) * | 1992-05-19 | 1995-01-10 | Akzo Nobel N.V. | Fabry-perot with device mirrors including a dielectric coating outside the resonant cavity |
DE4334578A1 (en) * | 1993-10-11 | 1995-04-20 | Dirk Winfried Dipl In Rossberg | Spectrally tunable IR-sensor |
EP0668490A2 (en) * | 1994-02-17 | 1995-08-23 | Vaisala Oy | Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis |
EP0693683A1 (en) * | 1994-07-07 | 1996-01-24 | Vaisala Oy | Selective infrared detector |
EP0930481A2 (en) * | 1995-06-07 | 1999-07-21 | Northrop Grumman Corporation | Interferometer |
US5920391A (en) * | 1995-10-27 | 1999-07-06 | Schlumberger Industries, S.A. | Tunable Fabry-Perot filter for determining gas concentration |
US5584117A (en) * | 1995-12-11 | 1996-12-17 | Industrial Technology Research Institute | Method of making an interferometer-based bolometer |
EP0903565A1 (en) * | 1997-09-19 | 1999-03-24 | Commissariat A L'energie Atomique | Integrated tunable Fabry-Pérot interferometer |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100472201C (en) * | 2005-12-27 | 2009-03-25 | 中国科学院物理研究所 | Sensing unit having both interaction effect and plasma oscillation effect and uses thereof |
CN109884837A (en) * | 2019-04-26 | 2019-06-14 | 昆山锐芯微电子有限公司 | Lightwave filter |
Also Published As
Publication number | Publication date |
---|---|
FR2805052A1 (en) | 2001-08-17 |
EP1255971A1 (en) | 2002-11-13 |
AU2001235612A1 (en) | 2001-08-20 |
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