CN104777685A - Blue-phase liquid crystal PM (Phase Modulation) optical system - Google Patents

Blue-phase liquid crystal PM (Phase Modulation) optical system Download PDF

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Publication number
CN104777685A
CN104777685A CN201510203326.9A CN201510203326A CN104777685A CN 104777685 A CN104777685 A CN 104777685A CN 201510203326 A CN201510203326 A CN 201510203326A CN 104777685 A CN104777685 A CN 104777685A
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liquid crystal
optical device
phase liquid
blue
light
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CN104777685B (en
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严静
李青
郭正波
邢宇菲
闵晓
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Southeast University
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Southeast University
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • 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
    • G02F1/13793—Blue phases

Abstract

The invention relates to a blue-phase liquid crystal PM (Phase Modulation) optical system. The blue phase liquid crystal PM optical system consists of a blue-phase liquid crystal PM device and an external optical system; the blue-phase liquid crystal PM device comprises a silicon substrate, a pixel electrode, a blue-phase liquid crystal, a public electrode and an upper substrate which are sequentially arranged from bottom to up; the external optical system comprises a first optical device, a second optical device and a third optical device, wherein the first optical device is used for receiving incident light and generating a first reflection light and a first transmission light which is opposite to the first reflection light, the second optical device is used for generating a second transmission light and a second reflection light which is vertical to the second transmission light, and the third optical device is used for forming the second transmission light by the first transmission light. The blue-phase liquid crystal PM device adopts a silicon substation reflection model for driving the blue-phase liquid crystal to control phase distribution, and an optical path is 2 times that a traditional reflection model by combining the external optical system; furthermore, the blue-phase liquid crystal PM optical system is low in voltage and quick to respond, the PM features can be improved by automatically compensating the phase deviation brought by a edge electric field, and the resolution can be improved.

Description

A kind of blue phase liquid crystal phase modulated optical system
Technical field
The present invention relates to a kind of phase modulated optical system, particularly relate to a kind of phase modulated optical system based on blue phase liquid crystal self-adaptation liquid crystal.
Background technology
Liquid crystal phase modulator, especially the liquid crystal phase modulator of phase-only modulation can only be modulated Wave-front phase, do not cause the absorption to luminous energy, therefore diffraction efficiency is high, exclusive advantage is revealed to the direction of light wave wave beam, the control table of space distribution, in fields such as optical interconnection, optical communication, optical oomputing, photoelectronic warfares, there is great potential using value.
The phase-modulator that current employing nematic liquid crystal is formed, adopts the parallel evenly distributed liquid crystal of parallel-oriented formation at the liquid crystal display having upper and lower two pieces of glass substrates to form, produces phase-modulation.Prebasal plate, from glass substrate, is public relations electrode layer, oriented layer respectively; Metacoxal plate, from glass substrate, is phase control unit control electrode layer, oriented layer respectively.Make liquid crystal display by front-back baseboard, the thickness of screen is determined by the liner being dispersed in glass substrate inside surface, liquid crystal display inside perfusion nematic liquid crystal.The principle of work of liquid crystal phase modulator, applies different voltage at the control electrode of liquid crystal phase control unit, between front-back baseboard, produces electric field.The arrangement of the liquid crystal molecule axle in the middle of liquid crystal display produces and changes, for above-mentioned parallel evenly distributed liquid crystal molecule, under electric field action, due to liquid crystal extraordinary ray n echange along with extra electric field, phase difference φ is also changed along with extra electric field, like this under different voltage effects, device produces the phase-modulation effect to incident light.Normally by selecting suitable liquid crystal material parameters, thickness of liquid crystal box, under certain voltage effect, produce the amount of phase modulation of 2 π.Along with the development of the technology such as 3-D display and optical communication, improve further the resolution requirement of phase-modulator, accelerate further the response time of phase-modulation, the phase-modulator that current nematic liquid crystal is formed can not meet the demands.
Indigo plant is a kind of special liquid crystal phase mutually, has the physical characteristics of many excellences.The working mechanism of blue phase liquid crystal is different from traditional nematic liquid crystal.Macroscopically say, blue phase liquid crystal is based on Kerr effect (Kerr effect), and not during added electric field, blue phase liquid crystal is isotropy; After applying electric field, molecule changes along long axis direction, shows the anisotropy of optics and electricity.Change due to its molecule occurs, so have the response time of sub-millisecond magnitude at local location.The optical isotropy of blue phase liquid crystal, sub-Millisecond response time, become display field of future generation without the need to characteristics such as orientation and large optical Kerr effects and optoelectronic areas has competitive power new material, be with a wide range of applications.
The present invention proposes a kind of blue phase liquid crystal phase modulated optical system.Adopt silica-based reflective-mode to drive blue phase liquid crystal to control the PHASE DISTRIBUTION of light, and combine outer optical system, make light path be 2 times of traditional reflective-mode.This structure has low-voltage, responds fast, and the phase offset that auto-compensation fringe field brings, can Phase Modulation Properties be improved, improve and differentiate.
Summary of the invention
The object of the invention is, for the limitation that existing liquid crystal phase modulator response speed is slow and resolution is low, to propose a kind of blue phase liquid crystal phase modulated optical system, improve response speed, improve Phase Modulation Properties, improve resolution.
Technical scheme of the present invention is:
A kind of blue phase liquid crystal phase modulated optical system, it is characterized in that: be made up of blue phase liquid crystal phase modulator and outer optical system two parts, described blue phase liquid crystal phase modulator comprises the silicon substrate, pixel electrode, blue phase liquid crystal, public electrode and the upper substrate that set gradually from bottom to top; Described outer optical system comprises, for receiving incident light and producing the first optical device of the first reflected light and first transmitted light reverse with the first reflected light, for generation of the second optical device of the second transmitted light and second reflected light vertical with the second transmitted light, and formed the 3rd optical device of described second transmitted light by described first transmitted light; Described first optical device and the second optical device are positioned at the upper surface of described upper substrate, described first transmitted light is reflected to form through described pixel electrode by the first reflected light, and described second reflected light is reflected to form through described pixel electrode and the second optical device successively by the second transmitted light.
It is characterized in that: be also provided with 1/1st wave plate at described first optical device or between the second optical device and the 3rd optical device.
Also be provided with photoresistance barricade at described upper substrate upper surface, this photoresistance barricade is between described first optical device and the second optical device.
Described first optical device and the second optical device are Amici prism or light splitting piece.
Described 3rd device is two right-angle prisms be oppositely arranged or the optical prism be oppositely arranged and lens combination.
Blue phase liquid crystal phase modulated optical System Working Principle of the present invention is as follows:
When incident ray polarized light impinges perpendicularly on the first optical device, transmissive portions light splitting is absorbed by light baffle wall through the first optical device, and the first reflected light enters into blue phase liquid crystal phase modulator left-half.By applying voltage between pixel electrode and public electrode, blue phase liquid crystal is under Kerr effect effect, and refractive index spatial changes, thus realizes the modulation to incident light phase place.Light through blue phase liquid crystal phase modulator reflects from pixel electrode, form the first transmitted light, get back to the first optical device, first transmitted light is through 1/2nd wave plates, control 1/2nd wave plates and incident light polarization angular separation are 45 degree, then after 1/2nd wave plates, the first transmitted light polarization direction turn 90 degrees.First transmitted light forms the second transmitted light again after the 3rd optical device, enters the right half part of blue phase liquid crystal phase modulator after the second optical device, by applying voltage between the pixel electrode and public electrode of correspondence, modulates incident light phase place.Second transmitted light, through pixel electrode reflection and the reflection of the second optical device, forms the second reflected light and exports.This structure light path is the twice of traditional reflective mode liquid crystal phase modulator, greatly can reduce driving voltage.Further, due to the effect of two point of one wave plate, incident light is through blue phase liquid crystal phase modulator left-half and right half part, and phase place accumulative is respectively by ordinary refraction index n owith extraordinary ray refractive index n ejointly bring.For ordinary refraction index n othe phase-delay quantity produced reduces than theoretical phase-delay quantity under fringe field effect, and for extraordinary ray refractive index n ethis modulation optical system that the phase-delay quantity produced increases than theoretical phase-delay quantity and adopts us to propose under fringe field effect, light is after 1/2nd wave plates, direction of polarized light turn 90 degrees, and total amount of phase modulation of whole system is ordinary refraction index n owith extraordinary ray refractive index n ecumulative, therefore, can the phase deviation that brings of the fringing field effect that caused by pressure reduction between pixel electrode of auto-compensation, thus improve phase-modulation precision.
When incidence natural lights impinges perpendicularly on the first optical device, transmissive portions light splitting is absorbed by light baffle wall through the first optical device, and the first reflected light enters into blue phase liquid crystal phase modulator left-half.By applying voltage between pixel electrode and public electrode, blue phase liquid crystal is under Kerr effect effect, and refractive index spatial changes, thus realizes the modulation to incident light phase place.Light through blue phase liquid crystal phase modulator reflects from pixel electrode, forms the first transmitted light, gets back to the first optical device.First transmitted light forms the second transmitted light again after the 3rd optical device, enters the right half part of blue phase liquid crystal phase modulator after the second optical device, by applying voltage between the pixel electrode and public electrode of correspondence, modulates incident light phase place.Second transmitted light, through pixel electrode reflection and the reflection of the second optical device, forms the second reflected light and exports.This structure light path is the twice of traditional reflective mode liquid crystal phase modulator, greatly can reduce driving voltage.
Reasonable, blue phase liquid crystal phase modulated optical system of the present invention, has lower driving voltage.
Reasonable, blue phase liquid crystal phase modulated optical system of the present invention, can the phase offset brought of auto-compensation fringe field effects, effectively improves phase-modulation precision, improves resolution.
Reasonable, blue phase liquid crystal phase modulated optical system of the present invention, without the need to oriented layer, can greatly reduce technique and prepare difficulty.
Reasonable, blue phase liquid crystal phase modulated optical system of the present invention, has the response time fast.
The present invention compared with prior art, has following beneficial effect:
1, blue phase liquid crystal phase modulated optical system of the present invention, utilizes outer Optical System Design, makes light path be 2 times of traditional reflective-mode, blue phase liquid crystal phase-modulation voltage is reduced.
2, blue phase liquid crystal phase modulated optical system of the present invention, employing be blue phase liquid crystal, the response time can reduce greatly, even reaches submicrosecond magnitude.
3, blue phase liquid crystal phase modulated optical system of the present invention, can the phase offset brought of auto-compensation fringe field effects, thus more accurate phase face control can be obtained, be conducive to preparing more small pixel size, more high-resolution blue phase liquid crystal phase modulator.
Accompanying drawing explanation
Fig. 1 is blue phase liquid crystal phase modulated optical system schematic (for linearly polarized light incident light) of the present invention.
Fig. 2 is blue phase liquid crystal phase modulated optical system schematic (for natural light incident light) of the present invention.
In figure: 1, blue phase liquid crystal phase modulator; 2, outer optical system; 3, silicon substrate; 4, pixel electrode; 5, blue phase liquid crystal 6, public electrode; 7, upper substrate; 8, the first optical device; 9,1/2nd wave plates; 10, the 3rd optical device; 11, light baffle wall; 12, the second optical device.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
Embodiment one, blue phase liquid crystal phase modulated optical system schematic (for linearly polarized light incident light)
A kind of blue phase liquid crystal phase modulated optical system, its structure as shown in Figure 1, its structure is made up of blue phase liquid crystal phase modulator 1 and outer optical system 2 two parts, and blue phase liquid crystal phase modulator 1 sets gradually silicon substrate 3, pixel electrode 4, blue phase liquid crystal 5, public electrode 6 and upper substrate 7 from bottom to top; Described outer optical system 2 comprises, for receiving incident light and producing the first optical device 8 of the first reflected light and first transmitted light reverse with the first reflected light, for generation of the second optical device 12 of the second transmitted light and second reflected light vertical with the second transmitted light, and formed the 3rd optical device 10 of described second transmitted light by described first transmitted light; Described first optical device 8 and the second optical device 12 are positioned at the upper surface of described upper substrate 7, described first transmitted light is reflected to form through described pixel electrode 4 by the first reflected light, and described second reflected light is reflected to form through described pixel electrode 4 and the second optical device 12 successively by the second transmitted light.At described first optical device 8 or be also provided with 1/1st wave plate 9 between the second optical device 12 and the 3rd optical device 10.Between described first optical device 8 or the second optical device 12, be also provided with photoresistance barricade 11 at described upper substrate 7 upper surface.
As follows shown in this blue phase liquid crystal phase modulated optical System Working Principle: when incident ray polarized light impinges perpendicularly on the first optical device 8, transmissive portions light splitting is absorbed by light baffle wall 11 through the first optical device 8, and the first reflected light enters into blue phase liquid crystal phase modulator 1 left-half.By applying voltage between pixel electrode 4 and public electrode 6, blue phase liquid crystal 5 is under Kerr effect effect, and refractive index spatial changes, thus realizes the modulation to incident light phase place.Light through blue phase liquid crystal phase modulator 1 reflects from pixel electrode 4, form the first transmitted light, get back to the first optical device 8, first transmitted light is through 1/2nd wave plates 9, controlling 1/2nd wave plates 9 is 45 degree with incident light polarization angular separation, then after 1/2nd wave plates 9, the first transmitted light polarization direction turn 90 degrees.First transmitted light forms the second transmitted light again after the 3rd optical device 10, the right half part of blue phase liquid crystal phase modulator 1 is entered after the second optical device 12, by applying voltage between the pixel electrode 4 and public electrode 6 of correspondence, incident light phase place is modulated.Second transmitted light to reflect and the second optical device 12 reflects through pixel electrode 4, forms the second reflected light and exports.Wherein, Δ n is the electroluminescent variations in refractive index of blue phase liquid crystal, Δ n sfor blue phase liquid crystal saturated index change, E sfor saturated electric field level, E is extra electric field size, n isofor blue phase liquid crystal refractive index size during non-making alive, n ofor ordinary refraction index, n efor extraordinary ray refractive index, n efffor effective extraordinary ray refractive index, θ is the angle between incident light and the optical axis of crystal, and λ is lambda1-wavelength, and d is that the box of blue phase liquid crystal phase modulator 1 is thick, and ψ is phase-delay quantity.Therefore, this structure, compared with traditional reflective lcd phase-modulator, has the optical path difference of twice, effectively can reduce driving voltage, and employing is blue phase liquid crystal, has the response speed of sub-millisecond.Further, because its total phase-delay quantity is by ordinary refraction index n owith extraordinary ray refractive index n ecumulative to obtain, can the phase deviation that brings of auto-compensation fringe field effects, obtain accurate phase control, improve resolution.
Δn＝Δn s(1-exp(-E/E S) 2) (1)
n o = n iso - Δn 3 - - - ( 2 )
n e = n iso + 2 Δn 3 - - - ( 3 )
n eff ( E ) = n o ( E ) n e ( E ) n o 2 ( E ) sin 2 ( θ ) + n e 2 ( E ) cos 2 ( θ ) - - - ( 4 )
ψ = 4 π λ ∫ 0 d ( n eff ( E ) + n o ( E ) ) dz - - - ( 5 )
Embodiment two, blue phase liquid crystal phase modulated optical system schematic is for natural light incident light
A kind of blue phase liquid crystal phase modulated optical system, its structure as shown in Figure 2, its structure is made up of blue phase liquid crystal phase modulator 1 and outer optical system 2 two parts, and blue phase liquid crystal phase modulator 1 sets gradually silicon substrate 3, pixel electrode 4, blue phase liquid crystal 5, public electrode 6 and upper substrate 7 from bottom to top; Described outer optical system 2 comprises, for receiving incident light and producing the first optical device 8 of the first reflected light and first transmitted light reverse with the first reflected light, for generation of the second optical device 12 of the second transmitted light and second reflected light vertical with the second transmitted light, and formed the 3rd optical device 10 of described second transmitted light by described first transmitted light; Described first optical device 8 and the second optical device 12 are positioned at the upper surface of described upper substrate 7, described first transmitted light is reflected to form through described pixel electrode 4 by the first reflected light, and described second reflected light is reflected to form through described pixel electrode 4 and the second optical device 12 successively by the second transmitted light.Between described first optical device 8 or the second optical device 12, be also provided with photoresistance barricade 11 at described upper substrate 7 upper surface.
As follows shown in this blue phase liquid crystal phase modulated optical System Working Principle: when incident ray polarized light impinges perpendicularly on the first optical device 8, transmissive portions light splitting is absorbed by light baffle wall 11 through the first optical device 8, and the first reflected light enters into blue phase liquid crystal phase modulator 1 left-half.By applying voltage between pixel electrode 4 and public electrode 6, blue phase liquid crystal 5 is under Kerr effect effect, and refractive index spatial changes, thus realizes the modulation to incident light phase place.Light through blue phase liquid crystal phase modulator 1 reflects from pixel electrode 4, forms the first transmitted light, gets back to the first optical device 8.First transmitted light forms the second transmitted light again after the 3rd optical device 10, the right half part of blue phase liquid crystal phase modulator 1 is entered after the second optical device 12, by applying voltage between the pixel electrode 4 and public electrode 6 of correspondence, incident light phase place is modulated.Second transmitted light to reflect and the second optical device 12 reflects through pixel electrode 4, forms the second reflected light and exports.Wherein, Δ n is the electroluminescent variations in refractive index of blue phase liquid crystal, Δ n sfor blue phase liquid crystal saturated index change, E sfor saturated electric field level, E is extra electric field size, n isofor blue phase liquid crystal refractive index size during non-making alive, n ofor ordinary refraction index, λ is lambda1-wavelength, and d is that the box of blue phase liquid crystal phase modulator 1 is thick, and ψ is phase-delay quantity.Therefore, this structure, compared with traditional reflective lcd phase-modulator, has the optical path difference of twice, effectively can reduce driving voltage, and employing is blue phase liquid crystal, has the response speed of sub-millisecond.
Δn＝Δn s(1-exp(-E/E S) 2) (1)
n o = n iso - Δn 3 - - - ( 2 )
ψ = 8 π λ ∫ 0 d n o ( E ) dz - - - ( 3 )
The present embodiment only gives the concrete example application of part, but for the patent personnel being engaged in flat-panel monitor, also can design various deformation product according to above enlightenment, this is still considered to be covered by among the present invention.

Claims (5)

1. a blue phase liquid crystal phase modulated optical system, it is characterized in that: be made up of blue phase liquid crystal phase modulator (1) and outer optical system (2) two part, described blue phase liquid crystal phase modulator (1) comprises the silicon substrate (3), pixel electrode (4), blue phase liquid crystal (5), public electrode (6) and the upper substrate (7) that set gradually from bottom to top; Described outer optical system (2) comprises, for receiving incident light and producing first optical device (8) of the first reflected light and first transmitted light reverse with the first reflected light, for generation of second optical device (12) of the second transmitted light and second reflected light vertical with the second transmitted light, and formed the 3rd optical device (10) of described second transmitted light by described first transmitted light; Described first optical device (8) and the second optical device (12) are positioned at the upper surface of described upper substrate (7), described first transmitted light is reflected to form through described pixel electrode (4) by the first reflected light, and described second reflected light is reflected to form through described pixel electrode (4) and the second optical device (12) successively by the second transmitted light.
2. a kind of blue phase liquid crystal phase modulated optical system according to claim 1, is characterized in that: be also provided with 1/1st wave plate (9) described first optical device (8) or between the second optical device (12) and the 3rd optical device (10).
3. the blue phase liquid crystal phase modulated optical system according to claims 1 or 2, it is characterized in that:, also be provided with photoresistance barricade (11) at described upper substrate (7) upper surface, this photoresistance barricade (11) is positioned to be stated between the first optical device (8) and the second optical device (12).
4. blue phase liquid crystal phase modulated optical system according to claim 1 and 2, is characterized in that: described first optical device (8) and the second optical device (12) are Amici prism or light splitting piece.
5. the blue phase liquid crystal phase modulated optical system according to claims 1 or 2, is characterized in that: described 3rd optical device (10) is two right-angle prisms be oppositely arranged or the optical prism be oppositely arranged and lens combination.
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CN109964171A (en) * 2016-11-11 2019-07-02 依视路国际公司 Phase-modulator and optical device
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