CN111221158A - Electrically tunable optical filter insensitive to polarization state of incident light - Google Patents
Electrically tunable optical filter insensitive to polarization state of incident light Download PDFInfo
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- 239000011521 glass Substances 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 29
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 27
- 238000002310 reflectometry Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000000411 transmission spectrum Methods 0.000 abstract description 6
- 238000001228 spectrum Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 16
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/213—Fabry-Perot type
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Abstract
The invention discloses an electric adjustable optical filter insensitive to the polarization state of incident light, which comprises a first Fabry-Perot interference cavity and a second Fabry-Perot interference cavity, wherein the first Fabry-Perot interference cavity and the second Fabry-Perot interference cavity are liquid crystal boxes driven by a power supply; the first Fabry-Perot interference cavity comprises two spaced glass substrates, two opposite surfaces of the two glass substrates are inner surfaces which are parallel to each other, the incident direction of light is vertical to the inner surfaces, and transparent electrodes, a broadband high-reflectivity dielectric film and a liquid crystal orientation film are sequentially plated on the inner surfaces; the transparent electrodes on the glass substrates are respectively connected with two stages of alternating current voltage sources by leads, first nematic liquid crystals with positive dielectric anisotropy are filled between the glass substrates, and the orientation direction of the first nematic liquid crystals is parallel to the inner surfaces of the two glass substrates. The invention has the advantages of large free spectrum range, small full width at half maximum of a transmission spectrum, large adjustment range of transmission wavelength, small thickness of a liquid crystal box, short response time, simple structure and high reliability.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to an electrically tunable optical filter insensitive to the polarization state of incident light.
Background
The electrically tunable optical filter is an important optical element and has wide application in optical remote sensing, hyperspectral imaging, medical imaging and the like. Materials such as liquid crystal and electro-optic crystal are often used to manufacture electrically tunable filters, and the electro-optic effect of these materials can be used to realize the electrical control characteristic of the filters. Since liquid crystal materials have a large birefringence, their use for the production of electrically tunable filters is particularly advantageous, for example, in that a large tuning range can be achieved.
However, the conventional electrically tunable optical filter based on liquid crystal often has only a filtering effect on the incident extraordinary ray, but has no effect on the ordinary ray component, because the refractive index of the liquid crystal is changed for the extraordinary ray and remains unchanged for the ordinary ray under the action of the external electric field. This sensitivity to the polarization state of incident light characteristic of conventional electrically tunable filters limits the use of electrically tunable filters. In addition, the conventional electrically tunable optical filter based on liquid crystal (such as Lyot or Solc type optical filter) has the defects of large full-height half-width of transmission spectrum, large thickness of liquid crystal box, long response time and the like.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide an electrically tunable optical filter that is insensitive to the polarization state of incident light. The optical filter is not sensitive to the polarization state of incident light, and has the advantages of large free spectrum range, small full width at half maximum of transmission spectrum, large adjustment range of transmission wavelength, small thickness of liquid crystal box, short response time, simple structure, no mechanical moving part and high reliability.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an electric adjustable optical filter insensitive to the polarization state of incident light comprises a first Fabry-Perot interference cavity and a second Fabry-Perot interference cavity, the principle and the basic structure are the same, and the optical filter and the liquid crystal box are both driven by a power supply;
the first Fabry-Perot interference cavity comprises two spaced glass substrates, two opposite surfaces of the two glass substrates are inner surfaces which are parallel to each other, the incident direction of light is vertical to the inner surfaces, and transparent electrodes, a broadband high-reflectivity dielectric film and a liquid crystal orientation film are sequentially plated on the inner surfaces; transparent electrodes on the two glass substrates are respectively connected with two stages of an alternating-current voltage source by leads, first nematic liquid crystal with positive dielectric anisotropy is filled between the two glass substrates, and the orientation direction of the first nematic liquid crystal is parallel to the inner surfaces of the two glass substrates;
a second nematic liquid crystal with positive dielectric anisotropy is filled between the two glass substrates of the second Fabry-Perot interference cavity;
the inner surfaces of the two glass substrates of the first Fabry-Perot interference cavity and the inner surfaces of the two glass substrates of the second Fabry-Perot interference cavity are parallel to each other.
The broadband high-reflectivity dielectric film is a series of separated and alternating high-refractive-index and low-refractive-index dielectric film layers, and the high reflectivity can be realized within the working wavelength range by adjusting the thickness and the refractive index of each film layer.
The first nematic liquid crystal and the second nematic liquid crystal are the same liquid crystal.
The thickness of the first nematic liquid crystal is equal to that of the second nematic liquid crystal.
The orientation directions of the first nematic liquid crystal and the second nematic liquid crystal are vertical to each other.
And the voltage signal of the alternating current voltage source connected with the transparent electrode of the first Fabry-Perot interference cavity is the same as the voltage signal of the alternating current voltage source connected with the transparent electrode of the second Fabry-Perot interference cavity.
The invention has the beneficial effects that:
the invention can realize the band-pass filter which is insensitive to the polarization state of the incident light and can be electrically regulated and controlled, and the transmission center wavelength lambda is 2nod/m (m is an integer), and by changing the magnitude of V, the central wavelength λ of the transmitted light can be controlled. The invention has the advantages of large free spectrum range, small full width at half maximum of a transmission spectrum, large adjustment range of transmission wavelength, small thickness of a liquid crystal box, short response time, simple structure and high reliability.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an electrically tunable optical filter that is insensitive to the polarization state of incident light;
in the figure, a first Fabry-Perot interference cavity 1, a second Fabry-Perot interference cavity 2, glass substrates 3-1, 3-2, 3-3 and 3-4, transparent electrodes 4-1, 4-2, 4-3 and 4-4, broadband high-reflectivity dielectric films 5-1, 5-2 and 5-4, liquid crystal alignment films 6-1, 6-2, 6-3 and 6-4, an alternating current voltage source 7, a first alignment phase liquid crystal 8 and a second alignment phase liquid crystal 9.
FIG. 2 is a transmission spectrum of an embodiment of an electrically tunable optical filter that is insensitive to the polarization state of incident light;
in the figure, the embodiment of the electrically tunable optical filter insensitive to the polarization state of incident light has 12 light transmission channels in total, and the central wavelength of the transmitted light can be controlled by controlling different values of n.
Detailed Description
The invention is further elucidated with reference to the figures and embodiments.
Examples
As shown in fig. 1, an electrically tunable optical filter insensitive to the polarization state of incident light includes a first fabry-perot interference cavity 1 and a second fabry-perot interference cavity 2. Incident light enters the first Fabry-Perot interference cavity 1 to be filtered for the first time, and then enters the second Fabry-Perot interference cavity 2 to be filtered for the second time.
The first Fabry-Perot interference cavity 1 and the second Fabry-Perot interference cavity 2 are both liquid crystal boxes which can be driven by power supplies.
The first Fabry-Perot interference cavity 1 comprises two glass substrates (3-1, 3-2) which are spaced at a certain distance, two opposite surfaces of the two glass substrates (3-1, 3-2) are defined as inner surfaces of the two glass substrates, the inner surfaces of the two glass substrates are parallel to each other, the incident direction of light rays is vertical to the inner surfaces of the two glass substrates, and transparent electrodes (4-1, 4-2), broadband high-reflectivity dielectric films (5-1, 5-2) and liquid crystal orientation films (6-1, 6-2) are sequentially plated on the inner surfaces of the two glass substrates. Transparent electrodes (4-1, 4-2) on two glass substrates (3-1, 3-2) are respectively connected with two stages of an alternating current voltage source 7 by leads, first alignment phase liquid crystals 8 with positive dielectric anisotropy are filled between the two glass substrates, and the orientation direction of the first alignment phase liquid crystals 8 is parallel to the inner surfaces of the two glass substrates.
The second Fabry-Perot interference cavity 2 comprises two glass substrates (3-3, 3-4) which are spaced apart at a certain distance, two opposite surfaces of the two glass substrates (3-3, 3-4) are defined as inner surfaces of the two glass substrates, the inner surfaces of the two glass substrates are parallel to each other, the incident direction of light is vertical to the inner surfaces of the two glass substrates, transparent electrodes (4-3, 4-4), broadband high-reflectivity dielectric films (5-3, 5-4) and liquid crystal orientation films (6-3, 6-4) are sequentially plated on the inner surfaces of the two glass substrates, the transparent electrodes of the two glass substrates are respectively connected with two stages of an alternating current voltage source 7 through leads, a second nematic liquid crystal 9 with positive dielectric anisotropy is filled between the two glass substrates, and the orientation direction of the second nematic liquid crystal 9 is parallel to the two glass substrates 3-3, 3-4 inner surface.
The inner surfaces of the two glass substrates (3-1, 3-2) of the first Fabry-Perot interference cavity 1 and the inner surfaces of the two glass substrates (3-3, 3-4) of the second Fabry-Perot interference cavity 2 are parallel to each other.
The broadband high-reflectivity dielectric film (5-1, 5-2, 5-4) is an optical thin film with high reflectivity and low loss in a wide wavelength range, and can be realized by plating a plurality of dielectric films, and the reflectivity of the broadband high-reflectivity dielectric film is defined as R, and the transmissivity of the broadband high-reflectivity dielectric film is defined as T.
An effective value of the voltage signal of the alternating voltage source 7 is defined as V.
The first nematic phase liquid in the first Fabry-Perot interference cavity 1The crystal 8 and the second nematic liquid crystal 9 in the second Fabry-Perot interference cavity 2 are the same liquid crystal, and the refractive index of the ordinary light of the liquid crystal is defined as noThe refractive index of the extraordinary ray is ne. The orientation direction of the first alignment phase liquid crystal 8 in the first Fabry-Perot interference cavity 1 is vertical to the orientation direction of the second alignment phase liquid crystal 9 in the second Fabry-Perot interference cavity 2. The thickness of the first nematic liquid crystal 8 is equal to the thickness of the second nematic liquid crystal 9, which is defined as d. An included angle theta is defined between the director of the first nematic liquid crystal 8 and the normal line of the inner surfaces of the two glass substrates (3-1, 3-2)1The angle between the director of the second nematic liquid crystal 9 and the normal of the inner surfaces of the two glass substrates (3-3, 3-4) is theta2. Equivalent refractive index n of extraordinary ray incident to the first Fabry-Perot interference cavity 11Is composed of
Equivalent refractive index n of extraordinary ray incident to the second Fabry-Perot interference cavity 22Is composed of
Due to theta1And theta2Equal in size and determined by the value of V, so n1And n2The sizes are equal and are determined by the value of V. Definition of n1＝n2N, the size of n can be controlled by changing the size of V.
The light entering the first Fabry-Perot interference cavity 1 or the light entering the second Fabry-Perot interference cavity 2 has only the wavelength lambda satisfying 2noThe ordinary light component whose d/λ is an integer and the extraordinary light component whose wavelength λ satisfies 2nd/λ is an integer can be transmitted from the first fabry-perot interference cavity 1 or the second fabry-perot interference cavity 2. Since the ordinary light component of the light entering the first Fabry-Perot interference cavity 1 corresponds to the extraordinary light component of the light entering the second Fabry-Perot interference cavity 2, the extraordinary light component of the light entering the first Fabry-Perot interference cavity 1 corresponds to the ordinary light component of the light entering the second Fabry-Perot interference cavity 2Therefore, for any polarization state light rays sequentially entering the first Fabry-Perot interference cavity 1 and the second Fabry-Perot interference cavity 2, only when the wavelength lambda of the light rays simultaneously satisfies 2nod/λ and 2nd/λ are integers, light of that wavelength can eventually be transmitted from the second fabry-perot interference cavity 2. Therefore, the invention can realize the band-pass filter which is insensitive to the polarization state of the incident light and can be electrically regulated, and the transmission center wavelength lambda is 2nod/m (m is an integer), and by changing the magnitude of V, the central wavelength λ of the transmitted light can be controlled.
For example, when the broadband high-reflectivity dielectric film has the wavelength of 400nm-700nm, R is 0.9, T is 0.1, d is 3.626 μm, no＝1.517，ne1.741, the invention can realize narrow-band filtering of 12 channels in the range of 400nm-700 nm. By changing the size of V, the value of n in the range of 1.517 < n ≦ 1.741 can be controlled, thereby controlling the central wavelength of the transmitted light. Table 1 lists the transmission wavelengths of the transmitted light for the 12 channels, and the corresponding values of n. Fig. 2 shows the transmission spectra of the 12 channels, and the corresponding values of n.
TABLE 1
| Channel number | Center wavelength of transmitted light | Value of n |
| 1 | 407.4nm | 1.5732 or 1.6293 |
| 2 | 423.1nm | 1.5754 or 1.6338 |
| 3 | 440.0nm | 1.5777 or 1.6384 |
| 4 | 458.3nm | 1.5801 or 1.6433 |
| 5 | 478.3nm | 1.5831 or 1.6490 |
| 6 | 500.0nm | 1.5860 or 1.6549 |
| 7 | 523.8nm | 1.5892 or 1.6614 |
| 8 | 550.0nm | 1.5929 or 1.6687 |
| 9 | 579.0nm | 1.5970 or 1.6768 |
| 10 | 611.1nm | 1.6012 |
| 11 | 647.1nm | 1.6063 or 1.6956 |
| 12 | 687.5nm | 1.6118 |
Claims (6)
1. An electric adjustable optical filter insensitive to the polarization state of incident light is characterized by comprising a first Fabry-Perot interference cavity and a second Fabry-Perot interference cavity, wherein the first Fabry-Perot interference cavity and the second Fabry-Perot interference cavity are liquid crystal boxes driven by a power supply;
the first Fabry-Perot interference cavity comprises two spaced glass substrates, two opposite surfaces of the two glass substrates are inner surfaces which are parallel to each other, the incident direction of light is vertical to the inner surfaces, and transparent electrodes, a broadband high-reflectivity dielectric film and a liquid crystal orientation film are sequentially plated on the inner surfaces; transparent electrodes on the two glass substrates are respectively connected with two stages of an alternating-current voltage source by leads, first nematic liquid crystal with positive dielectric anisotropy is filled between the two glass substrates, and the orientation direction of the first nematic liquid crystal is parallel to the inner surfaces of the two glass substrates;
a second nematic liquid crystal with positive dielectric anisotropy is filled between the two glass substrates of the second Fabry-Perot interference cavity;
the inner surfaces of the two glass substrates of the first Fabry-Perot interference cavity and the inner surfaces of the two glass substrates of the second Fabry-Perot interference cavity are parallel to each other.
2. The electrically tunable optical filter of claim 1, wherein the broadband high reflectivity dielectric film is a series of separate, alternating layers of high and low refractive index dielectric films, the high reflectivity being achieved over the operating wavelength range by adjusting the thickness and refractive index of each layer.
3. The electrically tunable optical filter of claim 1, wherein the first nematic liquid crystal and the second nematic liquid crystal are the same liquid crystal.
4. An electrically tunable optical filter according to claim 1 or 3, wherein the thickness of the first nematic liquid crystal is equal to the thickness of the second nematic liquid crystal.
5. The electrically tunable optical filter according to claim 1 or 3, wherein the alignment directions of the first nematic liquid crystal and the second nematic liquid crystal are perpendicular to each other.
6. The electrically tunable optical filter of claim 1, wherein a voltage signal of an ac voltage source connected to the transparent electrode of the first fabry-perot interference cavity is the same as a voltage signal of an ac voltage source connected to the transparent electrode of the second fabry-perot interference cavity.
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| CN111956006A (en) * | 2020-09-03 | 2020-11-20 | 合肥京东方光电科技有限公司 | Sleeping cabin and pillow adjusting method thereof |
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- 2020-02-18 CN CN202010100731.9A patent/CN111221158A/en active Pending
- 2020-02-18 CN CN202020182033.3U patent/CN211698504U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111956006A (en) * | 2020-09-03 | 2020-11-20 | 合肥京东方光电科技有限公司 | Sleeping cabin and pillow adjusting method thereof |
| CN111956006B (en) * | 2020-09-03 | 2024-05-17 | 合肥京东方光电科技有限公司 | Sleep cabin and pillow adjusting method thereof |
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Application publication date: 20200602 |