CN114137752B - Electrically driven near-far field simultaneous multiplexing dynamic display method and application - Google Patents
Electrically driven near-far field simultaneous multiplexing dynamic display method and application Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000010287 polarization Effects 0.000 claims abstract description 46
- 239000011449 brick Substances 0.000 claims abstract description 43
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 238000003384 imaging method Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 238000013500 data storage Methods 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 239000010410 layer Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000002061 nanopillar Substances 0.000 description 2
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- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Holo Graphy (AREA)
Abstract
The invention discloses an electrically driven near-far field simultaneous multiplexing dynamic display method and application. The electrically driven dynamic display subsurface consists of a bottom liquid crystal layer and a top subsurface layer. The bottom liquid crystal layer is an electrically driven polarization rotator that can rotate the polarization of incident light by 90 ° when no external voltage is applied, and does not rotate the polarization after the voltage is applied. The top supersurface is formed by periodically arranging a plurality of unit structures, and the unit structures comprise a substrate and nano bricks arranged on the substrate. According to the method, the size parameters of the unit structure are designed to construct the super surface, so that the switching display of the polarization multiplexing near-field display and the far-field holographic image in the broadband visible light range can be realized. The single nano brick has different responses of amplitude and phase to two different linearly polarized lights respectively so as to simultaneously realize the display of two near-field images and two far-field images under different polarizations. The invention can be used as intelligent dynamic display, imaging multiplexing, information encryption/security devices and the like.
Description
Technical Field
The invention relates to the field of micro-nano optics and optical holography, in particular to an electrically driven near-far field simultaneous multiplexing dynamic display method and application.
Background
Turning to intelligent photonic technology, superoptics is in the revolutionary process of transitioning from passive to active controllable devices. While various emerging dynamic regulatory mechanisms are explored and demonstrated, they have focused primarily on amplitude modulation of the spectrum or near field imaging switches. In addition, most dynamic regulation schemes inevitably require rather complex nano-processing techniques to process nano-active materials, thereby limiting their application to the outside of the laboratory. Thus, a viable solution to achieve multi-field (near-field and far-field) dynamic displays simultaneously in real life remains a key challenge. The invention herein proposes and shows a practical electrically driven liquid crystal integrated subsurface (ELIM) for advanced smart dynamic displays. By carefully screening the building block (α -Si nanopillar) geometry to build the architecture dictionary of the system, the present invention successfully overcomes the traditional spatial multiplexing and creates degeneracy of amplitude/phase selection, allowing arbitrary multi-field encryption. By utilizing the anisotropic property of ELIM orthogonal polarizations, quadruple dynamic display of electrically driven dynamic regulation is realized for the first time, and the quadruple dynamic display comprises simultaneously switchable double nano printing (near field) and double hologram (far field) with independent encrypted free images. In general, the present invention contemplates that meta-optics integrated with liquid crystal platforms can easily find practical application in real life for intelligent dynamic display, imaging multiplexing, and information encryption/security, among others.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a near-far field simultaneous multiplexing dynamic display method based on electric drive and application thereof.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
In a first aspect, the present invention provides a near-far field simultaneous multiplexing dynamic display method and application based on electric driving, comprising the steps of:
S1: building a unit structure for forming a super surface: the structure is a two-layer structure, and the two layers comprise a substrate and nano bricks arranged on the substrate; the super surface is formed by periodically arranging a plurality of unit structures on the same plane; the nano bricks in the unit structure have independently arranged size parameters;
s2: adopting an electromagnetic simulation tool, setting working wavelength to scan the sizes of different unit structures, and obtaining the sizes, phases and amplitudes of the nano bricks under different linearly polarized light;
S3: all the data are integrated to form a nano brick database with polarization, size, phase and amplitude, degeneracy of the amplitude and the phase is adopted, and the degeneracy of 16 structures which are originally super-surface and least need to be selected is 9, so that the traditional spatial multiplexing mode is avoided, and the decoupling of the amplitude and the phase is directly carried out by adopting a single structure, so that the phase and the amplitude can be independently encoded;
s4: and adopting an improved GS algorithm, simultaneously optimizing two phase type holographic patterns and two amplitude type near field patterns, finally obtaining four-dimensional matrix distribution based on polarization, phase and amplitude, searching in the nano brick database through the required matrix distribution, and finding each point in the matrix in the database. The searched nano brick structures are arranged to form a super surface with simultaneous switching near-far field display;
S5: the super surface is placed on a liquid crystal layer with an electrically driven polarization rotator function, and the near-far field simultaneous multiplexing electrically driven super optical dynamic in the broadband visible light range is realized by changing the voltage applied to the liquid crystal layer.
Further, in the step S1, both the nano brick and the substrate have a cuboid structure; wherein the cross section of the substrate is square; the substrate dimensions of the cell structures are the same.
Still further, the substrate of the unit structure is constructed of a low refractive index and transparent optical material, the material includes MgF 2、Al2O3、SiO2, and the material of the nano-brick includes TiO 2, si, ag, au, cu, al.
Further, the dimensional parameters in the steps S1 and S2 include the length L, the width W, the height H of the nano brick and the side length P of the cross section of the substrate.
Further, the rectangular side of the top surface of the substrate is taken as an x axis and a y axis, the vertex is taken as an origin, an xoy rectangular coordinate system is established, the dimension of the nano brick along the x axis is long L, and the dimension along the y axis is wide W; when different polarized light is incident, the phase and the amplitude are different. The data are integrated to form a database with polarization, size, phase and amplitude changes, so that the amplitude and the phase are decoupled, and the phase and the amplitude can be utilized for independent coding, thereby avoiding the traditional spatial multiplexing mode. And degeneracy of amplitude and phase is adopted, and the degeneracy of 16 structures which are originally super-surface and least need to be selected is 9.
Further, the method for converting the two pieces of holographic image information into the nano brick size information in the step S3 is as follows: under the working wavelength, the structural units with the nano bricks with different sizes have different phases, and the relationship between the size and the phase of the nano bricks is obtained through scanning; and then establishing a one-to-one correspondence relation between the pixels in the holographic image and the size of each unit structure, and finally realizing the storage of different holographic image information with different polarizations.
Further, the method for converting the two pieces of holographic and two pieces of near-field image information into the nano brick size information in the step S4 is as follows: selecting nano bricks with required polarization, phase and amplitude corresponding to the nano bricks in a database according to the calculated distribution of the phase and the amplitude under the working wavelength; and then establishing a one-to-one correspondence relation between the pixel in the image and the size of each unit structure, and finally realizing the storage of different holographic and near-field image information with different polarizations.
In a second aspect, the present invention provides a dynamic display capable of realizing near-far field simultaneous multiplexing based on electric driving, characterized in that: with the method as described in any one of the above, the super surface is placed on a liquid crystal layer having an electrically driven polarization rotator function, and electrically driven polarization conversion is combined with polarization multiplexing super surface, so that electrically driven super optical dynamic display of near-far field simultaneous multiplexing in the broadband visible light range is realized by only changing the voltage applied to the liquid crystal layer.
In a third aspect, the present invention provides an application of an electrically driven liquid crystal integrated subsurface modulated as described above in smart dynamic display, multichannel imaging, and information encoding, optical data storage, and security.
The working principle of the invention is as follows:
1. Structural dimension parameter of scanning unit
The dielectric nano brick array super surface is formed by periodically arranging a plurality of nano brick unit structures on a plane; the unit structure comprises a two-layer structure, and a substrate and a top layer are sequentially arranged from bottom to top; wherein the substrate is a square block with a rectangular top surface; the top layer is a nano brick; the side lengths of the top surfaces of the substrates are the same; establishing an xoy rectangular coordinate system by taking right-angle edges of the top surface of the substrate as an x axis and a y axis, wherein the dimension of the nano brick along the x axis is long L, and the dimension along the y axis is wide W; l and W are in the range of 0-400 nm; the period P of the unit structure is the side length of the top surface of the dielectric layer; and scanning the relationship between the size and the phase of the nano brick by an electromagnetic simulation method. For the substrate-nano brick structure, the structural parameters comprise the length L, the width W, the height H and the period P of the nano brick, and the working mode is transmission type.
2. Pattern information conversion
When the polarization multiplexing super surface is realized, nano bricks with required polarization, phase and amplitude are selected from a database according to the calculated distribution of the phase and the amplitude; then establishing a one-to-one correspondence between the pixel in the image and the size of each unit structure, and finally realizing the storage of different holograms and near-field image information with different polarizations
The invention has the following advantages and beneficial effects:
1. The nano brick database suitable for polarization, amplitude and phase is constructed, the traditional spatial multiplexing mode is avoided, and the decoupling of the amplitude and the phase is directly carried out by adopting a single structure, so that the phase and the amplitude can be independently encoded.
2. The degeneracy of amplitude/phase is adopted, so that the original minimum 16 unit structures are simplified to 9 units, and the difficulty of unit structure selection is greatly reduced.
3. The super surface is combined with the liquid crystal platform, so that the practical electric drive liquid crystal integrated super surface is realized.
4. The unit structure of the element has ultra-micro size, can promote the increase of the information coding capacity, and the holographic multiplexing channel can be widely applied to the fields of intelligent dynamic display, imaging multiplexing, information encryption/security and the like.
Drawings
FIG. 1 is a functional schematic of the present invention;
FIG. 2 is a schematic diagram of the overall device structure of the present invention;
FIG. 3 is a physical diagram of the overall device of the present invention;
FIG. 4 is a schematic diagram of a unit structure according to the present invention;
FIG. 5 is a database of nano-tile structures in accordance with the present invention;
FIG. 6 is a SEM image of a subsurface according to the present invention;
FIG. 7 is a schematic diagram of an optical measurement setup of a near field image in an embodiment of the invention, where a voltage is applied to the liquid crystal by the controller;
FIG. 8 is a schematic diagram of an optical measurement setup of a far-field image in an embodiment of the invention, with a controller applying a voltage to the liquid crystal;
FIG. 9 is a near field image and far field hologram of near field and far field measurements of different voltages in an embodiment of the present invention;
fig. 10 shows a near field image switching and a far field holographic image in the broadband visible range under white light in an embodiment of the present invention.
In the figure: l is the length of the nano-tile, H is the height of the nano-tile, W is the width of the nano-tile, and P x and P y are periods in the x and y directions.
Detailed Description
The technical scheme of the invention is further elaborated by the following with reference to the drawings and specific embodiments.
Example 1:
The embodiment is a dynamic display method based on simultaneous multiplexing of an electro-optical near field and a far field and application thereof:
FIG. 1 shows a functional schematic of the present invention, which can display two near field and two far field images and perform near-field and far field synchronous switching under voltage control.
Fig. 2 is a schematic diagram of the structure of the present invention, in which the liquid crystal layer with electric driving rotates the polarization of incident light with and without an applied voltage. Under the condition of no external voltage, the liquid crystal layer can enable the polarization of incident light to rotate 90 degrees and then pass through the top super surface; after an external voltage is applied, the liquid crystal molecular arrangement changes, the liquid crystal layer loses the function of a polarization rotator, and the polarization of incident light passing through the liquid crystal does not change. Fig. 3 is a photograph of a real object of the present invention. Fig. 4 shows a cell structure, which is a two-layer structure comprising a substrate and nanorotors disposed thereon. The cell structures with independent dimensional parameters are periodically arranged along the x direction and the y direction to form a silicon geometric array. Figure 5 shows a database of nano-tiles. And (3) adopting an electromagnetic simulation tool, setting working wavelength to scan the sizes of different unit structures, and obtaining the sizes, phases and amplitudes of the nano bricks under different linearly polarized light. All data are integrated to form a nano-tile database with polarization, size, phase and amplitude. Fig. 6 shows an SEM image of the subsurface. Fig. 7 shows an optical measurement setup schematic of an electrically driven near field image, switching of the near field image by changing the applied voltage. Fig. 8 shows a schematic diagram of an optical measurement setup of an electrically driven far field image, switching of the far field image by varying the applied voltage. Fig. 9 shows near field and far field images at different voltages at design wavelength 633 nm. Fig. 10 illustrates switching of near field images under white light and far field holographic images in the broadband visible range.
In order to facilitate understanding of the technical scheme of the invention, the technical principle of the structure of the invention for realizing the dynamic display of the simultaneous multiplexing of the super-optical near-far field of the electric drive is described in detail as follows:
The geometry of the nano-cell structure on the glass substrate along the polarization direction of the light determines its resonant phase shift. Based on this, the single-layer supersurface designed in this embodiment comprises a plurality of unit structures of different dimensional parameters, the length and width of which lie between 80nm and 360 nm. Such a rectangular array can be regarded as an integration of two separate arrays. Establishing an xoy rectangular coordinate system by taking right-angle sides of the top surface of the substrate as an x axis and a y axis and taking vertexes as original points, wherein the dimension of the nano brick along the x axis is long L, and the dimension along the y axis is wide W; when different polarized light is incident, the phase and the amplitude are different. The data are integrated to form a database with polarization, size, phase and amplitude changes, so that the amplitude and the phase are decoupled, and the phase and the amplitude can be utilized for independent coding, thereby avoiding the traditional spatial multiplexing mode. And degeneracy of amplitude and phase is adopted, and the degeneracy of 16 structures which are originally super-surface and least need to be selected is 9. Therefore, under the working wavelength, the structural units with the nano bricks with different sizes have different phases, and the relationship between the size and the phase of the nano bricks is obtained through scanning; and then establishing a one-to-one correspondence relation between the pixels in the holographic image and the size of each unit structure, and finally realizing the storage of different holographic image information with different polarizations.
In order to realize the electrically driven dynamic display of simultaneous multiplexing of the super-optics near-far field, the present embodiment combines a polarization multiplexing super-surface with a liquid crystal having a polarization rotator function. The super surface is placed on a liquid crystal layer with an electrically driven polarization rotator function, and electrically driven polarization conversion and polarization multiplexing type super surface are combined, so that the near-far field and simultaneous multiplexing type electrically driven super optical dynamic display in the broadband visible light range is realized only by changing the voltage applied to the liquid crystal layer.
In order to fully show the near-far field simultaneous multiplexing electric driving super-optical dynamic display method in the broadband visible light range, the embodiment shows the near-far field multiplexing display driven by voltage, and the meta-optical integrated with the liquid crystal platform is envisaged to be capable of easily finding practical application in real life for intelligent dynamic display, imaging multiplexing, information encryption/security and the like. The conceptual diagram of the near-far field simultaneous multiplexed electrically driven superoptical dynamic display of this embodiment shows that it can be simultaneously switchable with dual nano-printing (near-field) and dual hologram (far-field) with independent encryption free images.
In summary, the invention proposes and realizes an advanced intelligent dynamic display-oriented device, which can realize quadruple dynamic display, including switchable double nano printing (near field) and double holographic (far field) images, and is free to encrypt independently. By building up the architecture dictionary of the system and carefully screening the building block (silicon nanopillar) geometry, the present invention attempts and successfully achieves degeneracy of amplitude/phase selection, avoids the use of traditional spatial multiplexing, and facilitates near/far field optical displays. By integrating the super surface pattern onto the liquid crystal platform and exploiting its anisotropic properties for polarized light, the proposed device actually has electrically driven controllability enabling a four-fold multiplexing dynamic display in the near/far field. The device can realize multi-field fast dynamic display (millisecond level) at the same time, and can be used in the fields of intelligent dynamic display, imaging multiplexing, information encryption/security and the like.
The present invention is not limited to the above-mentioned embodiments, but any modifications, equivalents, improvements and modifications within the scope of the invention will be apparent to those skilled in the art.
Claims (5)
1. An electrically driven near-far field simultaneous multiplexing dynamic display method, characterized in that: the method comprises the following steps:
s1: building a unit structure for forming a super surface: the structure is a two-layer structure, and the two layers comprise a substrate and nano bricks arranged on the substrate; the super surface is formed by periodically arranging a plurality of unit structures on the same plane; the nano bricks in the unit structure have independently arranged size parameters; the dimension parameters comprise the length L, the width W, the height H of the nano brick and the side length P of the cross section of the substrate;
s2: adopting an electromagnetic simulation tool, setting working wavelength to scan the sizes of different unit structures, and obtaining the sizes, phases and amplitudes of the nano bricks under different linearly polarized light;
S3: the size, the phase and the amplitude data of the nano bricks under different linearly polarized lights obtained at the working wavelength are integrated into a nano brick database with polarization, size, phase and amplitude, the degeneracy of the amplitude and the phase is adopted, the degeneracy of 16 structures which are originally and have the minimum need to be selected on the super surface is 9, the traditional spatial multiplexing mode is avoided, and the decoupling of the amplitude and the phase is directly carried out by adopting a single structure, so that the independent coding of the phase and the amplitude can be carried out; the method for constructing the nano brick database is as follows:
Establishing an xoy rectangular coordinate system by taking right-angle sides of the top surface of the substrate as an x axis and a y axis and taking vertexes as original points, wherein the dimension of the nano brick along the x axis is long L, and the dimension along the y axis is wide W; when different polarized lights are incident, the polarized lights have different phase and amplitude changes; the data are integrated to form a database with polarization, size, phase and amplitude changes, so that the amplitude and the phase are decoupled, the phase and the amplitude can be utilized for independent coding, and the traditional spatial multiplexing mode is avoided; the degeneracy of amplitude and phase is adopted, and the degeneracy of 16 structures which are originally super-surface and least need to be selected is 9;
S4: adopting an improved GS algorithm, simultaneously optimizing two phase type holographic patterns and two amplitude type near field patterns, finally obtaining four-dimensional matrix distribution based on polarization, phase and amplitude, searching in the nano brick database according to the demand of matrix distribution, and selecting nano bricks corresponding to the demanded polarization, phase and amplitude in the database according to the distribution of calculated phase and amplitude; then establishing a one-to-one correspondence relation between the pixel in the image and the size of each unit structure, and finally realizing that different polarizations store different holographic and near-field image information, so that a super surface with simultaneous switching near-field display can be formed;
s5: the super surface is placed on a liquid crystal layer with an electrically driven polarization rotator function, and emergent light is switched between a first linear polarization state and a second linear polarization state by changing voltage applied to the liquid crystal layer, wherein the first linear polarization state and the second linear polarization state are orthogonal, so that near-field and far-field simultaneous multiplexing of electrically driven super optical dynamics in a broadband visible light range is realized.
2. The electrically driven near-far field simultaneous multiplexing dynamic display method of claim 1, wherein: in the step S1, the nano bricks and the substrate are both in cuboid structures; wherein the cross section of the substrate is square; the substrate dimensions of the cell structures are the same.
3. The electrically driven near-far field simultaneous multiplexing dynamic display method of claim 1 or 2, wherein: the substrate of the unit structure is constructed by a transparent optical material with low refractive index; the material is any one of MgF 2、Al2O3 or SiO 2; the nano brick is made of any one of TiO 2, si, ag, au, cu or Al.
4. A dynamic display capable of achieving near-far field simultaneous multiplexing based on electric driving, characterized in that: a method according to any one of claims 1 to 3, wherein the super-surface is placed on a liquid crystal layer having an electrically driven polarization rotator function, and the electrically driven polarization conversion is combined with the polarization multiplexing super-surface, whereby the near-far field simultaneous multiplexing electrically driven super-optical dynamic display in the broadband visible light range is achieved only by changing the voltage applied to the liquid crystal layer.
5. A use of the dynamic display of claim 4 for enabling near-far field simultaneous multiplexing based on electric driving, characterized by: use of an electrically driven liquid crystal integrated subsurface modulated by the method of any one of claims 1 to 3 for smart dynamic display, multichannel imaging, and information encoding, optical data storage and security.
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| 融合计算全息术与纳米印刷术的多功能超表面研究进展;郑国兴等;红外与激光工程;第49卷(第9期);115-129页 * |
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