CN112129704A - Focus-dividing planar polarization imaging device based on liquid crystal microarray device - Google Patents
Focus-dividing planar polarization imaging device based on liquid crystal microarray device Download PDFInfo
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Abstract
The invention discloses a focus-dividing plane type polarization imaging device based on a liquid crystal microarray device, which mainly comprises protective glass, the liquid crystal microarray device, a phase compensation plate, a polaroid and a detector focal plane; wherein the liquid crystal microarray device and the focal plane of the detector are matched with each other by pixels, 1 pixel of the focal plane corresponds to 1 microarray element, and 1 group of 4 pixels respectively detect polarization information in different directions; the phase compensation plate is used for eliminating the residual phase difference of the liquid crystal microarray device; the polaroid is matched with the liquid crystal microarray device and the focal plane assembly of the detector to jointly complete the polarization Stokes parameter measurement of the detection light beam. The invention can realize the polarization real-time characteristic detection capability corresponding to the pixel scale of the detection target, and has low manufacturing cost and wider working wave band.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to a focus-dividing planar polarization imaging device based on a liquid crystal microarray device.
Background
Human perception of the objective world is based on the signals associated with sensors transmitted to the human brain, and the development of experimental science has greatly expanded the ability and scope of human perception of the objective world over centuries. The human visual system plays a critical role in the transmission of numerous sensor signals to the human brain. The human eye vision system can sense the wavelength and the intensity change of light within a certain range, but the wavelength and the intensity are only one part of the basic characteristics of light waves, so that even in the visible light range, the human eye vision system can only sense partial information of the outside world, and the polarization information carried by the light cannot be sensed by human eyes.
Polarization is an important feature of electromagnetic waves and is another important attribute of information carried by light, in addition to wavelength, amplitude, and phase. According to the Fresnel reflection law and the kirchhoff thermal radiation theory, any target on the earth surface and in the atmosphere can generate special polarization characteristics determined by the properties of the target and the optical basic law in the processes of emitting, scattering, transmitting and radiating electromagnetic waves, and polarization information of different objects or different states of the same object can be different to a certain extent. The polarization imaging system images a target by controlling parameters such as the polarization state of incident light, and the like, and the important characteristics and marks of the polarization imaging system are that the polarization information, the intensity information and the spatial information of the target can be simultaneously acquired, so that a data cube containing the light intensity, the polarization and the position information of the target is formed. The high-resolution polarization imaging equipment can realize the advantage complementation of the polarization imaging technology and the light intensity imaging technology, effectively increase the information amount of optical detection, complete the boundary extraction and the feature recognition of targets under a complex background, realize the multi-mode information fusion of optical imaging, and enable the targets which are invisible under a common imaging system to be visible, thereby promoting the rapid development of the information technology. The method has important application value and wide application prospect in the fields of aerial remote sensing detection, agricultural meteorological and flood emergency monitoring, environmental protection monitoring, criminal investigation material evidence identification, target detection and the like.
The current common polarization modulation modes mainly comprise a mechanical rotation type, a partial amplitude type, a partial wave front type, a partial focus plane type and an electric control modulation type of a polaroid, wherein the mechanical rotation type and the electric control modulation type belong to a time domain polarization modulation mode, and the partial amplitude type, the partial wave front type and the partial focus plane type belong to a space domain polarization modulation mode. The polarization element is integrated on a focal plane in the focusing plane, 1 pixel of the focal plane corresponds to 1 micro-polarization element, a micro-nano structure polarization array is processed or stuck on the focal plane of the imaging detector, and 1 group of 4 pixels respectively sense the polarization vectors in different directions. When the polarization imaging is resolved, the response of the current pixel and the surrounding pixels is used for directly or indirectly obtaining the polarization components or polarization states of the pixel in different directions, and then the Stokes vector is resolved, and the polarization imaging resolution is completed. The method of the focal plane division can simultaneously obtain polarization components or polarization states of incident light in different directions, so that the method can image both static scenes and dynamic scenes, has a compact structure and a small volume, is a research hotspot of current polarization imaging and is a mainstream direction of future polarization imaging.
At present, the focal plane type polarization microarray device is mainly prepared by multi-process layered etching micro-nano processing based on an iodine-containing polyethylene film polaroid and a metal grating polaroid, and the device has the technical advantages of high extinction ratio, strong stability and the like, but has the technical defects of complex preparation process, high preparation cost, easy deliquescence and depolarization, limited structural size by diffraction limit, poor technical portability and the like, so certain obstruction is brought to market popularization of the product.
Zhao et al of hong kong science university and Myhre et al (2012) of arizona university in usa propose an ultraviolet non-contact photo-alignment technique to induce the orientation of dichroic fuel in guest-host liquid crystal, thereby preparing a high-resolution "guest-host" type micro-polarizer array. The micro-polarizer array has the technical advantages of simple preparation process, stable performance and the like, and has good technical portability and market popularization potential. But at the same time, because the method has higher requirements on dichroic materials, the extinction ratio and the working waveband of the method are limited.
According to the above, in the process of implementing the technical solution of the present invention, the present inventors find that the above technology has at least the following technical problems:
in the prior art, the existing focus-dividing plane type polarization microarray device based on the iodine-containing polyethylene film polaroid and the metal grating polaroid has high preparation cost and poor technical portability, and the extinction ratio and the working waveband of the guest-host type liquid crystal microarray device are limited.
Disclosure of Invention
The invention provides a focusing plane type polarization imaging device based on a liquid crystal microarray device, and aims to solve the technical problems that an existing focusing plane type polarization microarray device is high in preparation cost, poor in technical portability and limited in extinction ratio and working waveband. The invention can realize the polarization real-time characteristic detection capability corresponding to the pixel scale of the detection target in the visible-infrared band range, and has low manufacturing cost and wider working band.
The invention is realized by the following technical scheme:
a kind of split-focus plane type polarization imaging device based on liquid crystal microarray device, the said device includes detector focal plane, polaroid, phase compensating plate, liquid crystal microarray device and protective glass set up sequentially;
the liquid crystal microarray device and the detector focal plane are matched with each other through pixels, 1 pixel of the detector focal plane corresponds to 1 microarray element, and every 4 pixels are in one group and are used for respectively detecting polarization information in different directions;
the phase compensation plate is used for eliminating the residual phase difference of the liquid crystal microarray device;
the polaroid is matched with the liquid crystal microarray device and the focal plane of the detector to jointly complete the measurement of the polarization parameters of the detection light beam;
the protective glass is used for guaranteeing the internal environment of the whole device.
The invention can also realize the fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode. Specifically, the invention also comprises a liquid crystal driver;
the liquid crystal driver is used for electrically controlling and realizing the rapid switching between a multi-parameter polarization detection mode and a non-polarization detection mode of the polarization imaging device.
The polarization focal plane imaging device is carried out based on a liquid crystal microarray device, and the liquid crystal microarray device is mainly characterized in that the modulation of the polarization azimuth of incident light is realized based on a twisted liquid crystal device. Specifically, the liquid crystal microarray device realizes orientation of the orientation film microarray matched with the focal plane pixel size of the detector by utilizing an orientation film photo-induced arrangement technology, the twisted liquid crystal molecule long axis forms a preset liquid crystal microarray under the action of two layers of orientation films, and the polarization azimuth angle regulation corresponding to the pixel size of an incident beam is realized, so that the measurement of the polarization parameter of the incident beam is realized.
Preferably, the liquid crystal microarray device of the present invention includes a first glass substrate, a first alignment film, a liquid crystal layer, a second alignment film, and a second glass substrate, which are sequentially disposed;
the liquid crystal layer is formed by pouring a nematic liquid crystal material between the first glass substrate and the second glass substrate, and the thickness of the liquid crystal layer is controlled by a spacer;
the first alignment film and the second alignment film are used for inducing liquid crystal molecules in the liquid crystal layer to be arranged according to a specific direction, so that the electrically-controlled liquid crystal microarray device has a rotation characteristic.
Preferably, the liquid crystal microarray device of the present invention further comprises a first transparent conductive film disposed between the first glass substrate and the first alignment film and a second transparent conductive film disposed between the second glass substrate and the second alignment film;
the first transparent conductive film and the second transparent conductive film provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled.
Preferably, the liquid crystal microarray device of the present invention comprises a first dielectric film disposed between the first transparent conductive film and the first alignment film and a second dielectric film disposed between the second transparent conductive film and the second alignment film;
the first dielectric film and the second dielectric film are used for optical refractive index matching, and meanwhile, a leakage effect caused by structural defects is prevented.
Preferably, the liquid crystal microarray device of the present invention further comprises a first dielectric film disposed between the first glass substrate and the first alignment film and a second dielectric film disposed between the second glass substrate and the second alignment film;
the first dielectric film and the second dielectric film are used for optical refractive index matching, and meanwhile, a leakage effect caused by structural defects is prevented.
Preferably, the liquid crystal material of the present invention uses a mixture of chiral molecules having optically active properties and liquid crystals having birefringence properties with a predetermined concentration.
Preferably, the spacer of the present invention uses glass fibers, glass beads or plastic beads.
Preferably, the device of the invention adopts a pixel group bilinear interpolation method to improve the detection resolution, namely, each group of detection units is divided into 4 original pixels again, and then the missing offset component of each pixel is obtained by weighted average fusion of field pixels, thereby realizing the improvement of the image resolution. The polarization focal plane imaging chip provided by the invention realizes the improvement of the detection resolution of the chip by utilizing an interpolation method of an image element group. The focus-dividing plane type polarization detection chip can simultaneously acquire polarization components or polarization states of incident light in different directions, so that the static scene imaging and the dynamic scene imaging can be realized, correspondingly, because 4 pixels of the corresponding chip are combined into 1 group of units for detection, the image resolution is reduced by 3/4.
The invention has the following advantages and beneficial effects:
compared with other iodine polyethylene film polaroids and metal grating polaroid base focus plane type polarization microarray chips prepared by adopting a multi-procedure layered etching micro-nano processing technology, the device provided by the invention has the technical advantages of low preparation cost, stable performance, wide application range and the like; compared with a guest-host liquid crystal micro-polarizer array chip, the chip provided by the invention has the technical advantages of wide working waveband, high extinction ratio and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a focusing planar polarization imaging device based on a liquid crystal microarray device according to the present invention.
FIG. 2 is a schematic view of a liquid crystal microarray device of the present invention.
FIG. 3 is a schematic view showing the alignment of upper and lower alignment films of the liquid crystal microarray device of the present invention.
FIG. 4 is a schematic diagram showing the twist direction of the liquid crystal cell molecules of the liquid crystal microarray device of the present invention.
FIG. 5 is a schematic diagram of an interpolation model of a micro-polarization array according to the present invention.
Reference numbers and corresponding part names in the drawings:
101-detector focal plane, 102-polarizer, 103-phase compensation plate, 104-liquid crystal microarray device, 105-protective glass, 106-liquid crystal driver, 201-glass substrate, 202-conductive film, 203-dielectric film, 204-orientation film, 205-spacer, 206-liquid crystal layer.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
Compared with other iodine polyethylene film polaroids and metal grating polaroid based focusing plane type polarization micro-array devices prepared by adopting a multi-procedure layered etching micro-nano processing technology, the embodiment provides the focusing plane type polarization imaging device based on the liquid crystal micro-array device, which is low in manufacturing cost and wide in working wave band.
Specifically, as shown in fig. 1, the focusing planar polarization imaging apparatus of the present embodiment can realize a real-time detection function, and a hardware structure of the apparatus mainly includes a protective glass 105, a liquid crystal microarray device 104, a phase compensation plate 103, a polarizer 102, and a detector focal plane 101, which are sequentially disposed. Wherein the liquid crystal microarray device and the focal plane of the detector are matched with each other by pixels, 1 pixel of the focal plane corresponds to 1 microarray element, and 1 group of 4 pixels respectively detect polarization information in different directions; the phase compensation plate is used for eliminating the residual phase difference of the liquid crystal microarray device; the fast axis direction of the polaroid is fixed and can be set to be parallel to or perpendicular to the side length of a focal plane pixel, and the polarization Stokes parameter measurement of the detection light beam is completed together by matching with the liquid crystal microarray device and the detector focal plane component; the protective glass is positioned at the foremost end of the device and used for guaranteeing the internal environments of the whole device, such as dryness, cleanliness and the like.
The phase compensation plate performance needs to be correlated with the phase retardation amount of the liquid crystal microarray device to eliminate the residual phase difference of the liquid crystal microarray device. The phase compensation plate can adopt a quartz wave plate or other birefringent materials with matched performance. In this embodiment, the phase compensation plate is a polarizing film of an iodine-containing polyethylene film injected with a liquid crystal material, and the dual functions of phase compensation and polarization detection are simultaneously realized.
The focusing planar polarization imaging apparatus of the present embodiment can realize fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode by providing the liquid crystal driver 106. The liquid crystal driver is used for controlling the working state of the liquid crystal microarray device and can realize the quick switching between the chip multi-parameter polarization detection mode and the non-polarization detection mode in an electric control mode.
The polarization focal plane imaging device is carried out based on a liquid crystal microarray device, and the liquid crystal microarray device is mainly characterized in that modulation of the polarization direction of incident light is achieved based on a twisted liquid crystal device, a twisted liquid crystal molecule long axis forms a preset liquid crystal microarray under the action of two layers of orientation films, adjustment and control of a polarization azimuth angle corresponding to the pixel size of an incident beam are achieved, and measurement of polarization parameters of the incident beam is achieved. The whole liquid crystal microarray device mainly comprises two layers of glass substrates plated with transparent conductive films and dielectric films, an upper layer of alignment film, a lower layer of alignment film, a spacer and a liquid crystal layer.
As shown in fig. 2 in particular, the liquid crystal microarray device of the present embodiment includes a glass substrate 201, a transparent conductive film 202, a dielectric film 203, an alignment film 204, a spacer 205, and a liquid crystal layer 206.
The transparent conductive film is prepared on the inner surface of the glass substrate, is connected with the multichannel driving source through electrodes, and provides an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled. The dielectric film is positioned between the transparent conductive film and the orientation film, is mainly used for optical refractive index matching, and can prevent the electric leakage effect introduced by the structural defects. The alignment film is coated on the dielectric film, and the alignment direction of the upper and lower layers of alignment films can induce the liquid crystal molecules in the liquid crystal layer to be arranged according to a specific direction, so that the liquid crystal microarray device has optical rotation characteristics; the liquid crystal layer is formed by pouring nematic liquid crystal materials between the glass substrates, and the adopted liquid crystal materials are formed by a mixture with a certain concentration of chiral molecules with optical rotation properties and liquid crystal with birefringence properties; the thickness of the liquid crystal layer is controlled by a spacer, and the spacer can be made of glass fiber, glass beads or plastic beads. Particularly, when the surface quality of the transparent electrode film meets the device performance, the dielectric film layer can be omitted; if the chip does not need to switch between polarization modulation and non-polarization modulation states, the transparent conductive film layer can be omitted.
As shown in fig. 3, the schematic orientation diagram of the upper and lower orientation films of the liquid crystal polarization microarray is shown, wherein the orientation film on the glass substrate near one side of the protective glass is oriented horizontally with respect to the focal plane pixel side length as a whole, and the orientation film on the glass substrate on the other side is oriented in a microarray orientation matched with the focal plane pixel size by using a photo-alignment technology, wherein each 4 units are 1 group, and the angles between the photo-induced orientation directions of the 4 units in each group and the focal plane pixel side length are respectively, but not limited to, 0 degree, 45 degrees, 90 degrees and 135 degrees.
In order to realize the microarray orientation of the device, the orientation film on one side of the overall horizontal orientation can be a conventional mechanical friction orientation film or a light-induced orientation film, the orientation material on the other side is a light-operated orientation film, and the microarray orientation of the orientation film can be realized by utilizing a digital mask plate or a mechanical mask plate photoinduced alignment technology. In this embodiment, the photoalignment material is azobenzene SDl, and a mechanical mask plate is used to realize the photoinduced alignment of the microarray alignment film.
The polarization focal plane imaging device of the embodiment utilizes an interpolation method of an image element group to realize the improvement of the detection resolution of the chip. The focus-dividing plane type polarization detection chip can simultaneously acquire polarization components or polarization states of incident light in different directions, so that the static scene imaging and the dynamic scene imaging can be realized, correspondingly, because 4 pixels of the corresponding chip are combined into 1 group of units for detection, the image resolution is reduced by 3/4. In this embodiment, the detection resolution of the chip is improved by using, but not limited to, an image tuple bilinear interpolation method, that is, each group of detection units is subdivided into 4 original pixels, and then the polarization component missing from each pixel can be obtained by weighted average fusion of neighborhood pixels, so that the improvement of the image resolution is realized.
Specifically, as shown in fig. 4, the liquid crystal molecules in the liquid crystal cell of the liquid crystal microarray device rotate by different angles in the 4 cells in each group under the orientation induction of the orientation film. When the incident light enters the liquid crystal unit module, the polarization direction of the incident light is driven by the liquid crystal molecular spiral structure to realize optical rotation of different degrees. In the present embodiment, the long axis directions of the liquid crystal molecules in the 4 cells in each group respectively realize rotation of 0 degree, 45 degree, 90 degree and 135 degree, and correspondingly, the polarization directions of the incident light respectively realize rotation of 0 degree, 45 degree, 90 degree and 135 degree. If the polarizing direction of the rear polarizer is set to be 90 degrees, the light intensity respectively passes through the 0-degree, 45-degree, 90-degree and 135-degree optical rotation and the polarizer in each group, and the light intensity values obtained by the detector are respectivelyI 0 、I 45 、I 90 AndI 135 the Stokes parameters of the light polarization within each group (I、Q、U) And degree of polarizationDoPAngle of polarizationAoPRespectively according to the formula (1):
the image resolution of the focusing plane type polarization detection device of the embodiment is reduced by 3/4 because 4 pixels of the corresponding chip are combined into 1 group of units for detection. In this embodiment, the detection resolution of the chip is improved by using, but not limited to, an image tuple bilinear interpolation method, that is, each group of detection units is subdivided into 4 original pixels, and then the polarization component missing from each pixel can be obtained by weighted average fusion of neighborhood pixels, so that the improvement of the image resolution is realized.
As shown in the schematic diagram of the micro-polarization array interpolation model shown in fig. 5, in this embodiment, a bilinear interpolation method is selected to achieve the improvement of image resolution, taking the No. 6 pixel unit as an example, the corresponding polarization modulation component can be interpolated by a formula (2), and then the incident light polarization parameter corresponding to the No. 6 pixel can be completed according to the formula (1).
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A focusing plane type polarization imaging device based on a liquid crystal microarray device is characterized by comprising a detector focal plane (101), a polaroid (102), a phase compensation plate (103), a liquid crystal microarray device (104) and protective glass (105) which are arranged in sequence;
the liquid crystal microarray device (104) and the detector focal plane (101) are subjected to pixel matching, 1 pixel of the detector focal plane (101) corresponds to 1 microarray element, and every 4 pixels are in a group and are used for respectively detecting polarization information in different directions;
the phase compensation plate (103) is used for eliminating residual phase difference of the liquid crystal microarray device (104);
the polaroid (102) is matched with the liquid crystal microarray device (104) and the detector focal plane (101) to jointly complete the measurement of the polarization parameters of the detection light beam;
the protective glass (105) is used for protecting the internal environment of the whole device.
2. The liquid crystal microarray device-based focus-resolving planar polarization imaging apparatus of claim 1, further comprising a liquid crystal driver (106);
the liquid crystal driver (106) is used for realizing the quick switching between the multi-parameter polarization detection mode and the non-polarization detection mode of the polarization imaging device by electric control.
3. The device of claim 1 or 2, wherein the liquid crystal microarray device (104) utilizes an alignment film photoalignment technology to achieve alignment of an alignment film microarray matched with the focal plane pixel size of the detector, and the twisted liquid crystal molecule long axis forms a preset liquid crystal microarray under the action of two layers of alignment films, so that the polarization azimuth angle regulation corresponding to the pixel size of the incident beam is achieved, and further the measurement of the polarization parameters of the incident beam is achieved.
4. The device of claim 1 or 2, wherein the liquid crystal microarray device (104) comprises a first glass substrate, a first alignment film, a liquid crystal layer, a second alignment film and a second glass substrate arranged in sequence;
the liquid crystal layer is formed by pouring a nematic liquid crystal material between the first glass substrate and the second glass substrate, and the thickness of the liquid crystal layer is controlled by a spacer;
the first alignment film and the second alignment film are used for inducing liquid crystal molecules in the liquid crystal layer to be arranged according to a specific direction, so that the electrically-controlled liquid crystal microarray device has a rotation characteristic.
5. The liquid crystal microarray device-based focusing planar polarization imaging apparatus of claim 4, wherein the liquid crystal microarray device (104) further comprises a first transparent conductive film disposed between the first glass substrate and the first alignment film and a second transparent conductive film disposed between the second glass substrate and the second alignment film;
the first transparent conductive film and the second transparent conductive film provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled.
6. The device of claim 5, wherein the liquid crystal microarray device (104) further comprises a first dielectric film disposed between the first transparent conductive film and the first alignment film and a second dielectric film disposed between the second transparent conductive film and the second alignment film;
the first dielectric film and the second dielectric film are used for optical refractive index matching, and meanwhile, a leakage effect caused by structural defects is prevented.
7. The device of claim 4, wherein the liquid crystal microarray device (104) further comprises a first dielectric film disposed between the first glass substrate and the first alignment film and a second dielectric film disposed between the second glass substrate and the second alignment film;
the first dielectric film and the second dielectric film are used for optical refractive index matching, and meanwhile, a leakage effect caused by structural defects is prevented.
8. The device of claim 4, wherein the liquid crystal material is a mixture of chiral molecules with optically active properties and liquid crystals with birefringence with a predetermined concentration.
9. The liquid crystal microarray device-based focus-dividing planar polarization imaging apparatus according to claim 4, wherein the spacer is made of glass fiber, glass bead or plastic bead.
10. The device according to claim 1 or 2, wherein the device uses a pixel group bilinear interpolation method to improve the detection resolution, that is, each group of detection units is subdivided into the original 4 pixels, and then the missing offset component of each pixel is obtained by weighted average fusion of the field pixels, thereby realizing the improvement of the image resolution.
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| CN114414052A (en) * | 2022-01-21 | 2022-04-29 | 中国科学院长春光学精密机械与物理研究所 | Polarization intensity dual-mode imaging system based on twisted liquid crystal array |
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