CN114690479B - Liquid crystal geometric phase device, preparation method thereof and detection device - Google Patents
Liquid crystal geometric phase device, preparation method thereof and detection device Download PDFInfo
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- CN114690479B CN114690479B CN202210394664.5A CN202210394664A CN114690479B CN 114690479 B CN114690479 B CN 114690479B CN 202210394664 A CN202210394664 A CN 202210394664A CN 114690479 B CN114690479 B CN 114690479B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 151
- 238000001514 detection method Methods 0.000 title abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 140
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims abstract description 102
- 125000006850 spacer group Chemical group 0.000 claims description 20
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- 238000006116 polymerization reaction Methods 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000004005 microsphere Substances 0.000 claims description 3
- UWCWUCKPEYNDNV-LBPRGKRZSA-N 2,6-dimethyl-n-[[(2s)-pyrrolidin-2-yl]methyl]aniline Chemical group CC1=CC=CC(C)=C1NC[C@H]1NCCC1 UWCWUCKPEYNDNV-LBPRGKRZSA-N 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 75
- 238000010586 diagram Methods 0.000 description 15
- 230000010287 polarization Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 230000003098 cholesteric effect Effects 0.000 description 12
- 238000000137 annealing Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 238000004528 spin coating Methods 0.000 description 5
- 238000012512 characterization method Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133541—Circular polarisers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
-
- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133543—Cholesteric polarisers
-
- 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
- G02F1/13718—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 a change of the texture state of a cholesteric liquid crystal
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Analytical Chemistry (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
The embodiment of the invention discloses a liquid crystal geometric phase device, a preparation method thereof and a detection device. The liquid crystal geometric phase device comprises a first substrate, a second substrate and a two-chiral coexisting liquid crystal layer positioned between the first substrate and the second substrate, wherein the two-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which first chiral cholesteric liquid crystals and second chiral cholesteric liquid crystals coexist; the first substrate is provided with a first orientation layer towards one side of the second substrate, and the second substrate is provided with a second orientation layer towards one side of the first substrate. According to the technical scheme provided by the embodiment of the invention, a uniformly distributed two-chiral coexistence system is formed by the first chiral cholesteric liquid crystal and the second chiral cholesteric liquid crystal, so that the spin-selective geometric phase regulation and control of the traditional cholesteric liquid crystal can be broken through, the simultaneous reflection and geometric phase modulation of the two-chiral circularly polarized light are realized, and the generation of broadband reflection vortex rotation and vector light is particularly realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of liquid crystal microstructures and planar optics, in particular to a liquid crystal geometric phase device, a preparation method thereof and a detection device.
Background
The reflection light of the cholesteric liquid crystal contains a geometric phase modulation effect, which provides a new platform for the development of the planar optical field.
However, the traditional cholesteric liquid crystal is limited by a single-chiral spiral structure, only single-chiral circularly polarized light can be modulated, simultaneous modulation of double-chiral circularly polarized light cannot be realized, and superposition of corresponding conjugate geometric phases cannot be realized.
Disclosure of Invention
The embodiment of the invention provides a liquid crystal geometric phase device, a preparation method and a detection device thereof, wherein the liquid crystal geometric phase device utilizes a first chiral cholesteric liquid crystal and a second chiral cholesteric liquid crystal to form a uniformly distributed two-chiral coexistence system so as to break through the self-selective geometric phase regulation and control of the traditional cholesteric liquid crystal, realize simultaneous reflection and geometric phase modulation of two-chiral circularly polarized light, and particularly show that broadband reflection vortex rotation and vector light are generated.
In a first aspect, an embodiment of the present invention provides a liquid crystal geometric phase device, including a first substrate, a second substrate, and a two-chiral coexisting liquid crystal layer disposed between the first substrate and the second substrate, where the two-chiral coexisting liquid crystal layer includes a liquid crystal layer in which first chiral cholesteric liquid crystal and second chiral cholesteric liquid crystal coexist, and the first chiral cholesteric liquid crystal and the second chiral cholesteric liquid crystal form interleaved liquid crystal micro-regions;
A first orientation layer is arranged on one side, facing the second substrate, of the first substrate, and a second orientation layer is arranged on one side, facing the first substrate, of the second substrate;
The first alignment layer and the second alignment layer have the same alignment direction, and the first alignment layer and the second alignment layer have control patterns with molecular directors in periodic gradual change distribution.
Optionally, the liquid crystal geometric phase device is a liquid crystal vortex light generator, and the molecular directors of the first orientation layer and the second orientation layer have control patterns of angular gradual change distribution, so that the liquid crystal molecular directors are in gradual change distribution of 0 ° -180 °, and the liquid crystal molecular director distribution satisfies: α=qθ+α 0; alpha represents the azimuth angle of the director of the liquid crystal molecules, q is a half value of the topological charge of vortex light, theta is the azimuth angle, and alpha 0 is the initial azimuth angle.
Optionally, the first chiral cholesteric liquid crystal is a left-handed cholesteric liquid crystal, the second chiral cholesteric liquid crystal is a right-handed cholesteric liquid crystal, or the first chiral cholesteric liquid crystal is a right-handed cholesteric liquid crystal, and the second chiral cholesteric liquid crystal is a left-handed cholesteric liquid crystal.
Optionally, the liquid crystal display device further comprises spacer particles located between the first substrate and the second substrate, wherein the spacer particles are used for supporting the first substrate and the second substrate, and a filling space of the two-chiral coexistence liquid crystal layer is formed.
Optionally, the extension length of the spacer is greater than or equal to 10 times of the pitch of liquid crystal molecules in the first chiral cholesteric liquid crystal along the direction perpendicular to the first substrate and the second substrate.
Optionally, the spacer includes at least one of a quartz microsphere and a quartz column.
In a second aspect, an embodiment of the present invention further provides a method for preparing a liquid crystal geometric phase device, which is used for preparing the liquid crystal geometric phase device, including:
providing a first substrate and a second substrate, wherein the first substrate and the second substrate are oppositely arranged;
forming a first orientation layer on one side of the first substrate facing the second substrate, and forming a second orientation layer on one side of the second substrate facing the first substrate;
Preparing a two-chiral coexisting liquid crystal layer between the first substrate and the second substrate to form a liquid crystal geometric phase device;
the double-chiral coexistence liquid crystal layer comprises a liquid crystal layer in which first chiral cholesteric liquid crystals and second chiral cholesteric liquid crystals coexist, the first chiral cholesteric liquid crystals and the second chiral cholesteric liquid crystals form staggered liquid crystal micro-areas, the handedness of the first chiral cholesteric liquid crystals and the handedness of the second chiral cholesteric liquid crystals are different, the first orientation layer and the second orientation layer have the same orientation direction, and the first orientation layer and the second orientation layer have control patterns in which molecular directors are periodically and gradually distributed.
Optionally, preparing a two-chiral coexisting liquid crystal layer between the first substrate and the second substrate includes:
Filling the filling area with a first chiral cholesteric liquid crystal and polymerized monomer mixture, and after the orientation layer is anchored, placing the liquid crystal box under an ultraviolet light source to complete polymerization to form a polymer network;
Immersing the polymerized liquid crystal box in acetone to wash away molecules which do not undergo polymerization reaction;
placing the washed liquid crystal box with the polymer network on a hot table, and heating to volatilize acetone molecules;
and filling the second chiral cholesteric liquid crystal into a liquid crystal box with a polymer network, wherein acetone molecules are completely volatilized.
Optionally, before the preparation of the two-chiral coexisting liquid crystal layer between the first substrate and the second substrate, the method further includes:
forming a spacer between the first substrate and the second substrate;
And the extension length of the spacer particles is more than or equal to 10 times of the liquid crystal molecular pitch in the first spiral cholesteric liquid crystal along the direction vertical to the first substrate and the second substrate.
In a third aspect, an embodiment of the present invention further provides a device for detecting an optical characteristic of a liquid crystal geometric phase device, including a generation unit and a detection unit for vortex rotation and vector light;
The generating unit comprises a laser, a half wave plate, a quarter wave plate, a beam splitter, a diaphragm and the liquid crystal geometric phase device which are sequentially arranged along a first direction and a common optical axis, the detecting unit comprises a modulator and a receiving screen which are sequentially arranged along a second direction, the modulator comprises a linear polaroid or a cylindrical lens, and the first direction and the second direction are intersected;
the light beam output by the laser device sequentially passes through the half wave plate, the quarter wave plate, the beam splitter and the diaphragm, and then enters the liquid crystal geometric phase device after being transmitted, the liquid crystal geometric phase device carries out geometric phase modulation and reflection on the incident light beam, and the reflected light beam is received by the receiving screen after being transmitted by the diaphragm, reflected by the beam splitter and transmitted by the modulator.
The liquid crystal geometric phase device provided by the embodiment of the invention comprises a first substrate, a second substrate and a double-chiral coexisting liquid crystal layer positioned between the first substrate and the second substrate, wherein the double-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which first chiral cholesteric liquid crystal and second chiral cholesteric liquid crystal coexist, and the first chiral cholesteric liquid crystal and the second chiral cholesteric liquid crystal form a staggered liquid crystal micro-area; a first orientation layer is arranged on one side of the first substrate facing the second substrate, and a second orientation layer is arranged on one side of the second substrate facing the first substrate; the first alignment layer and the second alignment layer have the same alignment direction, and the first alignment layer and the second alignment layer have control patterns with molecular directors in periodic gradual change distribution. The double-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which a first chiral cholesteric phase and a second chiral cholesteric phase coexist, and the first chiral cholesteric phase liquid crystal and the second chiral cholesteric phase liquid crystal form crisscross liquid crystal micro-areas on a sub-wavelength scale, so that a uniformly distributed double-chiral coexisting system is formed in the box; the first and second chiral cholesteric liquid crystals are anchored by the upper and lower surface orientation layers and take on a spiral structure of the cholesteric liquid crystals under the action of chiral agents, and the first chiral cholesteric liquid crystals are in a cholesteric liquid crystal polymer network form and form a stable polymer network through an ultraviolet polymerization process; the second chiral cholesteric liquid crystal is in a cholesteric liquid crystal form, and forms a spiral structure through chiral agents so as to break through the spin-selective geometric phase regulation and control of the traditional cholesteric liquid crystal, realize simultaneous reflection and geometric phase modulation of the double-chiral circularly polarized light, and particularly show the generation of broadband reflection type vortex rotation and vector light.
Drawings
FIG. 1 is a schematic diagram of a y-z side structure of a liquid crystal geometry phase device according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a device for detecting optical characteristics of a liquid crystal geometric phase device according to an embodiment of the present invention;
FIG. 3 is a diffraction light path characterization flare diagram of a liquid crystal geometric phase device according to an embodiment of the present invention;
Fig. 4 is a schematic flow chart of a method for manufacturing a liquid crystal geometric phase device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device for preparing a geometric phase of liquid crystal according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a spectrum characterization result of a liquid crystal geometric phase device before polymerization and after refilling according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a photomicrograph of a liquid crystal geometry phase device before polymerization and after refilling according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic view of a y-z side structure of a liquid crystal geometric phase device according to an embodiment of the present invention, referring to fig. 1, the liquid crystal geometric phase device provided in this embodiment includes a first substrate 10, a second substrate 20, and a two-chiral coexisting liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20, where the two-chiral coexisting liquid crystal layer 30 includes a liquid crystal layer in which a first chiral cholesteric liquid crystal 31 and a second chiral cholesteric liquid crystal 32 coexist, and the first chiral cholesteric liquid crystal 31 and the second chiral cholesteric liquid crystal 32 form a staggered liquid crystal micro-region; the first substrate 10 is provided with a first alignment layer 40 on a side facing the second substrate 20, and the second substrate 30 is provided with a second alignment layer 50 on a side facing the first substrate 10; the first and second alignment layers 40 and 50 have the same alignment direction, and the first and second alignment layers 40 and 50 have control patterns in which molecular directors are periodically and gradually distributed.
The material system with both hands coexisting has a relatively mature preparation process of washing-refilling, provides a material basis for realizing hundred percent reflection of cholesteric liquid crystal, and is stable and repeatable. The alignment of the first alignment layer 40 and the second alignment layer 50 can be achieved by photo-alignment technology, the liquid crystal molecules between the first substrate 10 and the second substrate 20 are anchored, and arbitrary geometric phase adjustment is achieved. Both the first and second chiral cholesteric liquid crystals 31 and 32 are anchored by the upper and lower surface alignment layers and exhibit a helical structure of cholesteric liquid crystals by chiral agent action. Specifically, the first chiral cholesteric liquid crystal 31 is in a cholesteric liquid crystal polymer network form, and forms a stable polymer network through an ultraviolet polymerization process; the second chiral cholesteric liquid crystal 32 is in the form of cholesteric liquid crystal and has a chiral structure. The first direction of rotation can be left-handed or right-handed, the second direction of rotation can be right-handed or left-handed, optionally, the first direction of rotation cholesteric liquid crystal 31 can be left-handed cholesteric liquid crystal, the second direction of rotation cholesteric liquid crystal 32 can be right-handed cholesteric liquid crystal, or the first direction of rotation cholesteric liquid crystal 31 can be right-handed cholesteric liquid crystal, the second direction of rotation cholesteric liquid crystal 32 can be left-handed cholesteric liquid crystal, and the implementation can be selected according to practical situations. The first alignment layer 40 and the second alignment layer 50 may include at least one of a photo-crosslinking material, a photo-degradable material, and a photo-cis-trans-isomerisable material. The materials are photo-oriented materials, and can generate physical or chemical reaction under the irradiation of ultraviolet polarized light to generate anisotropic surface acting force so as to induce the alignment of liquid crystal molecules. In one embodiment, the liquid crystal geometry phase device is optionally a liquid crystal vortex light generator, and the molecular directors of the first alignment layer 40 and the second alignment layer 50 have a control pattern of angular graded distribution such that the liquid crystal molecular directors have a graded distribution of 0 ° -180 °, and the liquid crystal molecular director distribution satisfies: α=qθ+α 0; alpha represents the azimuth angle of the director of the liquid crystal molecule, q is a half value of the topological charge of vortex light, theta is the azimuth angle, and alpha 0 is the initial azimuth angle so as to realize broadband reflection vortex rotation and vector light generation. In other embodiments, the molecular directors of the first alignment layer 40 and the second alignment layer 50 may be designed into other control patterns, and may be designed according to practical situations when implementing the present invention.
With continued reference to fig. 1, the liquid crystal geometry phase device optionally further comprises spacer particles 60 between the first substrate 10 and the second substrate 20, the spacer particles 60 being configured to support the first substrate 10 and the second substrate 20 to form a filling space for the two-handed coexisting liquid crystal layer 30.
It is understood that the positional relationship of the spacer 60 for supporting the first substrate 10 and the second substrate 20 is shown in fig. 1 by way of example only, and not the actual size and scale. Alternatively, the extending length of the spacer 60 is greater than or equal to 10 times the pitch of the liquid crystal molecules in the first-handed cholesteric liquid crystal 31 in the direction perpendicular to the first substrate 10 and the second substrate 20. In implementation, the spacer 60 may optionally include at least one of a quartz microsphere and a quartz column, and may be designed according to practical situations.
According to the technical scheme, the two-chiral coexistence liquid crystal layer comprises a liquid crystal layer with coexisting first chiral cholesteric phase and second chiral cholesteric phase, and the first chiral cholesteric phase liquid crystal and the second chiral cholesteric phase liquid crystal form crisscross liquid crystal micro-areas on a sub-wavelength scale, so that a uniformly distributed two-chiral coexistence system is formed in a box; the first and second chiral cholesteric liquid crystals are anchored by the upper and lower surface orientation layers and take on a spiral structure of the cholesteric liquid crystals under the action of chiral agents, and the first chiral cholesteric liquid crystals are in a cholesteric liquid crystal polymer network form and form a stable polymer network through an ultraviolet polymerization process; the second chiral cholesteric liquid crystal is in a cholesteric liquid crystal form, and forms a spiral structure through chiral agents so as to break through the self-selective geometric phase regulation and control of the traditional cholesteric liquid crystal, realize simultaneous reflection and geometric phase modulation of the double-chiral circularly polarized light, and particularly show that broadband reflection vortex rotation and vector light are generated.
Fig. 2 is a schematic structural diagram of a device for detecting optical characteristics of a liquid crystal geometric phase device according to an embodiment of the present invention. Referring to fig. 2, the detection apparatus provided in the present embodiment includes a generation unit 100 and a detection unit 200 of vortex rotation and vector light. The eddy current and vector light generating unit 100 includes a laser 101, a half-wave plate 102, a quarter-wave plate 103, a beam splitter 104, a diaphragm 105 and any one of the liquid crystal geometric phase devices 106 provided in the above embodiments, which are sequentially arranged along a first direction, the detecting unit 200 includes a modulator 201 and a receiving screen 202, which are sequentially arranged along a second direction, the modulator 201 includes a linear polarizer or a cylindrical lens, and the first direction and the second direction intersect; the light beam output by the laser 101 is transmitted through the half-wave plate 102, the quarter-wave plate 103, the beam splitter 104 and the diaphragm 105 in sequence and then enters the liquid crystal geometric phase device 106, the liquid crystal geometric phase device 106 carries out geometric phase modulation and reflection on the incident light beam, and the reflected light beam is received by the receiving screen 202 after being transmitted through the diaphragm 105, reflected by the beam splitter 104 and transmitted by the modulator 201.
Illustratively, referring to fig. 2, the generating unit 100 includes a laser 101, a half-wave plate 102, a quarter-wave plate 103, a beam splitter 104, a diaphragm 105, and a liquid crystal geometric phase device 106 sequentially arranged along a negative z-axis direction (the z-axis is the same as the z-axis in fig. 1, and is perpendicular to the plane in which the first substrate is located, i.e., the first direction); and modulator 201 and receiving screen 202 located in a direction perpendicular to the z direction (the negative y-axis direction in fig. 1, the same direction as in fig. 1, i.e., the second direction). The arrangement of the optical devices is merely illustrative, and is not limited to the embodiments of the present invention. When the incident light is circularly polarized light, the modulator 201 detects the vortex rotation topological charge using a cylindrical lens; when the incident light is linearly polarized light, the modulator 201 detects the vector light polarization distribution using a linear polarizing plate.
Fig. 3 is a diffraction optical path characterization flare diagram of a liquid crystal geometric phase device according to an embodiment of the present invention. Referring to fig. 3, when the incident light is right circularly polarized light (RCP), a vortex light spot can be obtained, and a cylindrical lens is used to detect that the vortex light topology charge is positive one (m= +1), corresponding to the upper left two diagrams in fig. 3; when the incident light is left circularly polarized Light (LCP), vortex light spots can be obtained, and a cylindrical lens is used for detecting that the vortex light topological charge is minus one (m= -1), which corresponds to the lower left two graphs in FIG. 3; when the incident light is linearly polarized Light (LP), a vector light spot diagram can be obtained, linear polaroids with different angles are used for detecting the polarization distribution of the vector light under the incidence condition of horizontal linear polarization, and detection light spots distributed in parallel to the direction of the polarization detection plate are obtained, so that the vector light is radial vector light and corresponds to five diagrams at the upper right in FIG. 3; under the condition of vertical linear polarization incidence, linear polarizers with different angles are used for detecting the polarization distribution of vector light, and detection light spots distributed perpendicular to the direction of the polarization detection plate are obtained, so that the vector light is angular vector light and corresponds to the lower right five diagrams in fig. 3. This is the effect of the superposition of the conjugate circular polarization geometry phases.
It should be noted that, the embodiment of the present invention only shows spot detection of a liquid crystal geometric phase device by way of example, but the liquid crystal geometric phase device provided by the present invention is not limited thereto, and in other embodiments, liquid crystal geometric phase devices with other performances are prepared according to actual needs, so that corresponding geometric phase modulation can be performed on an optical beam.
Fig. 4 is a schematic flow chart of a method for manufacturing a liquid crystal geometric phase device according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram corresponding to the method for manufacturing a liquid crystal geometric phase device according to an embodiment of the present invention. This embodiment may be applied to the preparation of any of the liquid crystal geometric phase devices provided in the above embodiments, and referring to fig. 4 and 5, the preparation method includes:
Step S110, providing a first substrate and a second substrate, where the first substrate and the second substrate are disposed opposite to each other.
The first substrate and the second substrate may be flexible substrates or rigid substrates with high light transmittance (greater than or equal to 85%). Illustratively, the first and second substrate materials may include quartz glass, ITO glass, or plain glass, and the thickness of the substrate may be 1-2mm.
Step S120, forming a first alignment layer on a side of the first substrate facing the second substrate, and forming a second alignment layer on a side of the second substrate facing the first substrate.
Optionally, forming the first alignment layer on a side of the first substrate facing the second substrate, and forming the second alignment layer on a side of the second substrate facing the first substrate includes:
Spin-coating an orientation material on one side of the first substrate facing the second substrate and one side of the second substrate facing the first substrate;
And annealing the first substrate and the second substrate which are spin-coated with the orientation material to form a first orientation layer and a second orientation layer with the same orientation direction.
By way of example, the spin-on process may include: firstly, regulating the rotating speed to 600-900 revolutions per minute, and controlling the first spin-coating time to 5-10 seconds to ensure that the orientation materials are uniformly distributed on the surface of the spin-coated substrate; and then the rotating speed is regulated to 2500-3500 rpm, and the second spin coating time is controlled to be 30-50 seconds, so that the orientation material is coated.
The annealing process may include: the annealing atmosphere is in air, the annealing temperature is 80-120 ℃, and the annealing time is 8-12 minutes.
It should be noted that the above rotation speed and spin-coating time are only exemplary, and in other embodiments, the rotation speed and spin-coating time may be adjusted according to actual requirements, so that the alignment film may control the alignment of cholesteric liquid crystal molecules.
And step S130, preparing a double-chiral coexisting liquid crystal layer between the first substrate and the second substrate to form the liquid crystal geometric phase device.
The double-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which first and second chiral cholesteric liquid crystals coexist, the first and second chiral cholesteric liquid crystals form staggered liquid crystal micro-regions, the handedness directions of the first and second chiral cholesteric liquid crystals are different, the first and second alignment layers have the same alignment direction, and the first and second alignment layers have control patterns in which molecular directors are periodically and gradually distributed along the angular direction.
Optionally, preparing a two-chiral coexisting liquid crystal layer between the first substrate and the second substrate, including:
Filling a first chiral cholesteric liquid crystal and a polymerized monomer mixture into the filling area, wherein the polymerized monomer mixture comprises polymerized monomers and photoinitiators, and after the orientation layer is anchored, placing the liquid crystal box under an ultraviolet light source to complete polymerization to form a polymer network; immersing the polymerized liquid crystal box in acetone to wash away molecules which do not undergo polymerization reaction; placing the washed liquid crystal box with the polymer network on a hot table, and heating to volatilize acetone molecules; and filling the second chiral cholesteric liquid crystal into a liquid crystal box with a polymer network, wherein acetone molecules are completely volatilized.
Optionally, before the preparation of the two-chiral coexisting liquid crystal layer between the first substrate and the second substrate, the method further includes:
Spacer particles are formed between the first substrate and the second substrate.
The extension length of the spacer is greater than or equal to 10 times of the liquid crystal molecular pitch in the first spiral direction cholesteric liquid crystal along the direction vertical to the first substrate and the second substrate. Alternatively, the spacer may be designed according to practical situations when at least one of the silica microspheres and the silica columns is embodied.
Fig. 6 is a schematic diagram of a spectrum characterization result of a liquid crystal geometric phase device before polymerization and after refilling according to an embodiment of the present invention. Referring to fig. 6, the liquid crystal geometry phase device has both left-handed circular polarization reflection and right-handed circular polarization reflection characteristics, and can achieve extremely high reflection in the range of 575-630nm, which is distinguished from spin-selective reflection before polymerization, i.e., reflection of only right-handed circular polarization, and transmission of left-handed circular polarization. Meanwhile, due to the design of the geometric phase pattern of the surface layer, the liquid crystal geometric phase device with two chiral coexistence can respectively carry out geometric phase modulation on reflected left-handed circularly polarized light and right-handed circularly polarized light, and vortex light beams and vector light beams are generated. The spectrum corresponding to the left circularly polarized light is represented by a solid line a, the spectrum corresponding to the right circularly polarized light is represented by a broken line b, and the spectrum corresponding to the linearly polarized light is represented by a dash-dot line c. Fig. 7 is a schematic diagram of a photomicrograph of a liquid crystal geometry phase device before polymerization and after refilling according to an embodiment of the invention. Referring to fig. 7, the planar structure is good before polymerization and after refilling, and there are substantially no dislocation lines, so the "wash-off-refill" process does not affect the cholesteric liquid crystal planar structure.
The technical scheme of the embodiment of the invention comprises a first substrate, a second substrate and a double-chiral coexisting liquid crystal layer positioned between the first substrate and the second substrate, wherein the double-chiral coexisting liquid crystal layer comprises a first chiral cholesteric phase and a second chiral cholesteric phase coexisting liquid crystal layer, and the first chiral cholesteric phase liquid crystal and the second chiral cholesteric phase liquid crystal form crisscross liquid crystal micro-areas on a sub-wavelength scale, so that a double-chiral coexisting system which is uniformly distributed in a box is formed. A first orientation layer is arranged on one side of the first substrate facing the second substrate, a second orientation layer is arranged on one side of the second substrate facing the first substrate, and a micro-nano photon structure specially designed for the liquid crystal material with the coexistence of the two hands is provided; the technical scheme of the embodiment of the invention breaks through the single-chiral circular polarization selective modulation characteristic of the traditional cholesteric liquid crystal and provides a thought for simultaneously modulating the conjugated circular polarization so as to realize superposition of reflective geometric phases, including but not limited to generating reflective vector light.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The liquid crystal geometric phase device is characterized by comprising a first substrate, a second substrate and a double-chiral coexisting liquid crystal layer positioned between the first substrate and the second substrate, wherein the double-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which first chiral cholesteric liquid crystal and second chiral cholesteric liquid crystal coexist, and the first chiral cholesteric liquid crystal and the second chiral cholesteric liquid crystal form staggered liquid crystal micro-areas on a sub-wavelength scale;
A first orientation layer is arranged on one side, facing the second substrate, of the first substrate, and a second orientation layer is arranged on one side, facing the first substrate, of the second substrate;
The first alignment layer and the second alignment layer have the same alignment direction, and the first alignment layer and the second alignment layer have control patterns with molecular directors periodically distributed in a gradual manner along the angular direction; the first chiral cholesteric liquid crystal is in a cholesteric liquid crystal polymer network form, and a stable polymer network is formed through an ultraviolet polymerization process; the second chiral cholesteric liquid crystal is in a cholesteric liquid crystal form, a chiral agent forms a spiral structure, and the chiral coexisting liquid crystal can generate broadband reflection vortex rotation and vector light.
2. The liquid crystal geometric phase device according to claim 1, wherein the liquid crystal geometric phase device is a liquid crystal vortex light generator, and the molecular directors of the first alignment layer and the second alignment layer have control patterns of angular gradient distribution so that the liquid crystal molecular directors are in 0 ° -180 ° gradient distribution, and the liquid crystal molecular director distribution satisfies: α=qθ+α 0; alpha represents the azimuth angle of the director of the liquid crystal molecules, q is a half value of the topological charge of vortex light, theta is the azimuth angle, and alpha 0 is the initial azimuth angle.
3. The liquid crystal geometric phase device of claim 1, wherein the first chiral cholesteric liquid crystal is a left-handed cholesteric liquid crystal, the second chiral cholesteric liquid crystal is a right-handed cholesteric liquid crystal, or the first chiral cholesteric liquid crystal is a right-handed cholesteric liquid crystal, and the second chiral cholesteric liquid crystal is a left-handed cholesteric liquid crystal.
4. The liquid crystal geometric phase device of claim 1, further comprising spacer particles between the first and second substrates, the spacer particles for supporting the first and second substrates, forming a fill space for the two-handed coexisting liquid crystal layer.
5. The liquid crystal geometric phase device according to claim 4, wherein the extension length of the spacer is greater than or equal to 10 times the pitch of liquid crystal molecules in the first chiral cholesteric liquid crystal in a direction perpendicular to the first substrate and the second substrate.
6. The liquid crystal geometry phase device of claim 4, wherein said spacer particles comprise at least one of quartz microspheres and quartz columns.
7. A method for manufacturing a liquid crystal geometric phase device according to any one of claims 1 to 6, comprising:
providing a first substrate and a second substrate, wherein the first substrate and the second substrate are oppositely arranged;
forming a first orientation layer on one side of the first substrate facing the second substrate, and forming a second orientation layer on one side of the second substrate facing the first substrate;
Preparing a two-chiral coexisting liquid crystal layer between the first substrate and the second substrate to form a liquid crystal geometric phase device;
The double-chiral coexisting liquid crystal layer comprises a liquid crystal layer in which first and second chiral cholesteric liquid crystals coexist, staggered liquid crystal micro-areas are formed by the first and second chiral cholesteric liquid crystals on a sub-wavelength scale, the handedness directions of the first and second chiral cholesteric liquid crystals are different, the first and second alignment layers have the same alignment direction, and the first and second alignment layers have control patterns in which molecular directors are periodically and gradually distributed along the angular direction;
Preparing a two-chiral coexisting liquid crystal layer between the first substrate and the second substrate, comprising:
Filling the filling area with a first chiral cholesteric liquid crystal and polymerized monomer mixture, and after the orientation layer is anchored, placing the liquid crystal box under an ultraviolet light source to complete polymerization to form a polymer network;
Immersing the polymerized liquid crystal box in acetone to wash away molecules which do not undergo polymerization reaction;
placing the washed liquid crystal box with the polymer network on a hot table, and heating to volatilize acetone molecules;
Filling the second chiral cholesteric liquid crystal into a liquid crystal box with a polymer network, wherein acetone molecules are completely volatilized.
8. The method of manufacturing according to claim 7, further comprising, before manufacturing the two-chiral coexisting liquid crystal layer between the first substrate and the second substrate:
forming a spacer between the first substrate and the second substrate;
And the extension length of the spacer particles is more than or equal to 10 times of the liquid crystal molecular pitch in the first spiral cholesteric liquid crystal along the direction vertical to the first substrate and the second substrate.
9. The device for detecting the optical characteristics of the liquid crystal geometric phase device is characterized by comprising a vortex rotation and vector light generating unit and a detecting unit;
The generating unit comprises a laser, a half wave plate, a quarter wave plate, a beam splitter, a diaphragm and the liquid crystal geometric phase device according to any one of claims 1 to 6, wherein the laser, the half wave plate, the quarter wave plate, the beam splitter, the diaphragm and the liquid crystal geometric phase device are sequentially arranged along a first direction, the detecting unit comprises a modulator and a receiving screen which are sequentially arranged along a second direction, the modulator comprises a linear polaroid or a cylindrical lens, and the first direction and the second direction are intersected;
the light beam output by the laser device sequentially passes through the half wave plate, the quarter wave plate, the beam splitter and the diaphragm, and then enters the liquid crystal geometric phase device after being transmitted, the liquid crystal geometric phase device carries out geometric phase modulation and reflection on the incident light beam, and the reflected light beam is received by the receiving screen after being transmitted by the diaphragm, reflected by the beam splitter and transmitted by the modulator.
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Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09265081A (en) * | 1996-03-29 | 1997-10-07 | Toshiba Corp | Reflection type liquid crystal display element |
| KR19990001276A (en) * | 1997-06-13 | 1999-01-15 | 구자홍 | LCD and its manufacturing method |
| JP2006276599A (en) * | 2005-03-30 | 2006-10-12 | Toshiba Corp | Reflective liquid crystal display and method for manufacturing same |
| CN101672947A (en) * | 2008-09-12 | 2010-03-17 | Jds尤尼弗思公司 | Optical vortex retarder micro-array |
| CN104142587A (en) * | 2014-07-16 | 2014-11-12 | 北京大学 | Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film |
| CN105093649A (en) * | 2015-08-14 | 2015-11-25 | 深圳市华星光电技术有限公司 | Blue light prevention polarizer and liquid crystal display panel |
| CN107193160A (en) * | 2017-07-28 | 2017-09-22 | 广西天山电子股份有限公司 | A kind of cholesteric liquid crystal device, preparation method and beam control system |
| CN107346084A (en) * | 2017-07-21 | 2017-11-14 | 华南师范大学 | A kind of ATR-FTIR reflection device and preparation method thereof |
| CN108051884A (en) * | 2018-01-03 | 2018-05-18 | 南京大学 | A kind of vortex beams detector and preparation method thereof |
| CN108132569A (en) * | 2016-11-30 | 2018-06-08 | 乐金显示有限公司 | Mirror unit and the display device including the mirror unit |
| CN110412808A (en) * | 2019-07-25 | 2019-11-05 | 苏州晶萃光学科技有限公司 | A kind of light beam deflector part, preparation method and light beam deviation detection device |
| CN111367004A (en) * | 2020-04-29 | 2020-07-03 | 刘奡 | Ink-jet printing preparation method of polarizer holographic grating |
| CN113138505A (en) * | 2021-02-23 | 2021-07-20 | 西北工业大学 | Ferroelectric liquid crystal geometric phase device and preparation system and preparation method thereof |
| CN113467117A (en) * | 2021-07-06 | 2021-10-01 | 南京大学 | Temperature-controlled vector vortex light beam detector, preparation method thereof and detection device |
| AU2021105963A4 (en) * | 2021-08-19 | 2021-10-28 | Nanjing University | Optical switch array based on chiral liquid crystals, preparation method thereof and method for beam steering |
| CN113777841A (en) * | 2021-08-13 | 2021-12-10 | 华南师范大学 | Reflector as well as preparation method and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6669999B2 (en) * | 2001-05-30 | 2003-12-30 | Industrial Technology Research Institute | Method for broadening bandwidth of cholesteric liquid crystal |
| ITTO20060303A1 (en) * | 2006-04-26 | 2007-10-27 | Consiglio Nazionale Ricerche | LETTER OF ASSIGNMENT FOLLOWS |
| US8300183B2 (en) * | 2010-11-15 | 2012-10-30 | MacroDisplay Inc. | Single layer high brightness full color reflective cholesteric displays |
| JP6689186B2 (en) * | 2013-03-13 | 2020-04-28 | イマジンオプティクス・コーポレイション | Polarization conversion system and manufacturing method thereof |
| US9690161B2 (en) * | 2014-07-30 | 2017-06-27 | Kent State University | Field induced heliconical structure of cholesteric liquid crystal |
| US20160170118A1 (en) * | 2014-12-15 | 2016-06-16 | Kent State University | Active retardation films based on polymer stabilized cholesteric liquid crystal |
-
2022
- 2022-04-14 CN CN202210394664.5A patent/CN114690479B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09265081A (en) * | 1996-03-29 | 1997-10-07 | Toshiba Corp | Reflection type liquid crystal display element |
| KR19990001276A (en) * | 1997-06-13 | 1999-01-15 | 구자홍 | LCD and its manufacturing method |
| JP2006276599A (en) * | 2005-03-30 | 2006-10-12 | Toshiba Corp | Reflective liquid crystal display and method for manufacturing same |
| CN101672947A (en) * | 2008-09-12 | 2010-03-17 | Jds尤尼弗思公司 | Optical vortex retarder micro-array |
| CN104142587A (en) * | 2014-07-16 | 2014-11-12 | 北京大学 | Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film |
| CN105093649A (en) * | 2015-08-14 | 2015-11-25 | 深圳市华星光电技术有限公司 | Blue light prevention polarizer and liquid crystal display panel |
| CN108132569A (en) * | 2016-11-30 | 2018-06-08 | 乐金显示有限公司 | Mirror unit and the display device including the mirror unit |
| CN107346084A (en) * | 2017-07-21 | 2017-11-14 | 华南师范大学 | A kind of ATR-FTIR reflection device and preparation method thereof |
| CN107193160A (en) * | 2017-07-28 | 2017-09-22 | 广西天山电子股份有限公司 | A kind of cholesteric liquid crystal device, preparation method and beam control system |
| CN108051884A (en) * | 2018-01-03 | 2018-05-18 | 南京大学 | A kind of vortex beams detector and preparation method thereof |
| CN110412808A (en) * | 2019-07-25 | 2019-11-05 | 苏州晶萃光学科技有限公司 | A kind of light beam deflector part, preparation method and light beam deviation detection device |
| CN111367004A (en) * | 2020-04-29 | 2020-07-03 | 刘奡 | Ink-jet printing preparation method of polarizer holographic grating |
| CN113138505A (en) * | 2021-02-23 | 2021-07-20 | 西北工业大学 | Ferroelectric liquid crystal geometric phase device and preparation system and preparation method thereof |
| CN113467117A (en) * | 2021-07-06 | 2021-10-01 | 南京大学 | Temperature-controlled vector vortex light beam detector, preparation method thereof and detection device |
| CN113777841A (en) * | 2021-08-13 | 2021-12-10 | 华南师范大学 | Reflector as well as preparation method and application thereof |
| AU2021105963A4 (en) * | 2021-08-19 | 2021-10-28 | Nanjing University | Optical switch array based on chiral liquid crystals, preparation method thereof and method for beam steering |
Non-Patent Citations (7)
| Title |
|---|
| Bragg reflective polychromatic vector beam generation from opposite-handed cholesteric liquid crystals;TIEGANG LIN;《Optics Letters》;第44卷(第11期);第2720-2723页 * |
| polychromatic optical vortex generation from patterned cholesteric liquid crystals;Junji Kobashi;《Physical Review Letters》(第116期);第253903(5)页 * |
| Realisation of cholesteric liquid-crystalline materials reflecting both right- and left-circularly polarised light using the wash-out/refill technique;Jinbao Guo;《Liquid Crystals》;第37卷(第2期);第171-178页 * |
| Ultra-broadband tunable Bragg-Berry optical vortex generators of a circularly symmetric chiroptic structure;Shun-An Jiang;《Advanced optical materials》;20210721;第9卷(第20期);第2100746页 * |
| 具有双螺旋结构胆甾相液晶聚合物复合材料研究进展;郭金宝;魏杰;;高分子通报(第04期);第87-98页 * |
| 叠层结构的手性液晶单元的反射谱特性;秦臻;方旭;毛鑫;黄子强;;液晶与显示;第26卷(第05期);第592-597页 * |
| 基于胆甾相液晶的光场调控器件的实验实现与性能研究;程顶立;《中国优秀硕士学位论文全文数据库基础科学辑》;20220315(第3（2022）期);第A005-198页 * |
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