CN109212796A - A kind of negative liquid crystal reflective spatial light modulator - Google Patents
A kind of negative liquid crystal reflective spatial light modulator Download PDFInfo
- Publication number
- CN109212796A CN109212796A CN201811239636.6A CN201811239636A CN109212796A CN 109212796 A CN109212796 A CN 109212796A CN 201811239636 A CN201811239636 A CN 201811239636A CN 109212796 A CN109212796 A CN 109212796A
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- Prior art keywords
- liquid crystal
- spatial light
- light modulator
- polarizing film
- layer
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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
- G02F1/1313—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 specially adapted for a particular application
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
Negative liquid crystal reflective spatial light modulator of the invention includes polarizing film, top glass substrate, upper transparent flat electrode, upper oriented layer, liquid crystal layer, lower oriented layer, reflecting layer, lower glass substrate；Liquid crystal layer uses the nematic liquid crystal of negativity, and vertically oriented；Polarizing film is rotatable type polarizing film with a scale, and the polarization direction of polarizing film is controllable, and rotatory polarization piece realizes the switching of amplitude modulation and phase-only modulation；Upper transparent flat electrode is made of indium tin oxide transparent conductive material；Reflecting layer is made of the aluminium film of high reflectance, and surface is made of diffusive reflective film making pattern, and driving voltage is applied on metallic reflector.Negative liquid crystal reflective spatial light modulator of the invention has the characteristics that simple production, modulation system diversity and phase-modulation range are big.
Description
Technical field
The present invention relates to spatial light modulator field, specifically a kind of negative liquid crystal reflective spatial light modulator.
Background technique
It is many that spatial light modulator is widely used in optical logic operation, high speed optical interconnection, input storage, output display etc.
Application field.There are many type of spatial light modulator, such as five or six ten kinds of microchannel plate, deformable mirror, magnetic-optic devices etc..
Optical phase plays an important role in optical information processing system, interference and optical interconnection, two-dimentional pure phase bit space light modulation
Device plays even more important effect, such as optical correlation connection, light network, phase-comparison technique in terms of optical Information Processing.Liquid
Brilliant spatial light modulator can be programmed real-time control with its good stability, and low-voltage can get biggish phase change
The advantages that, it occupies an important position in terms of optical Information Processing, and make the advantages that simple, price is low, easy to control by it
Concern by numerous scholars.But traditional liquid crystal spatial light modulator can not achieve cutting for amplitude modulation and phase-only modulation
It changes, and can not achieve amplitude when carrying out amplitude modulation and be continuously adjusted, furthermore with vibration when phase-only modulation
Width modulation.
Present invention aims to overcome that defect existing in the prior art, propose that a kind of production is simple, modulation system is more
The big negative liquid crystal reflective spatial light modulator of sample, phase-modulation range.
The present invention is achieved by the following technical solutions:
The present invention includes polarizing film, top glass substrate, upper transparent flat electrode, upper oriented layer, liquid crystal layer, lower oriented layer, reflection
Layer, lower glass substrate, and be arranged successively.1 polarizing film, 2 top glass substrates, transparent flat electrode on 3,4 upper oriented layers, 5 liquid crystal
Layer, 6 lower oriented layers, 7 reflecting layer, 8 lower glass substrates.
The polarizing film is rotatable type polarizing film with a scale, i.e. the polarization axis direction of polarizing film is controllable, rotatory polarization piece
Realize the switching of amplitude modulation mode and phase-only modulation mode.
The upper transparent flat electrode is made of the transparent conductive materials such as tin indium oxide (ITO) or indium zinc oxide (IZO),
For being grounded.
The liquid crystal layer uses the nematic liquid crystal of negativity, and is orientated perpendicular to glass substrate.
The reflecting layer uses the metal film production of high reflectance, and driving voltage is applied on metallic reflector, metal
Serve as pixel electrode in reflecting layer.
It is parallel to the principle of direction of an electric field according to the liquid crystal molecule short axle of power-up negative liquid crystal, applies on metallic reflector
When voltage, liquid crystal molecule can gradually be parallel to lower glass substrate；When long axis of liquid crystal molecule is parallel with the polarization axle of polarizing film
When, enter liquid crystal layer polarised light at this time and propagated along the optical axis direction of liquid crystal molecule, birefringent, change electricity does not occur for incident light
Pressure only changes the phase of incident light, and the negative liquid crystal reflective spatial light modulator works in pure phase bit pattern at this time；Turn
Dynamic polarizing film, changes the polarization direction of polarizing film, and making the polarization direction of incident light, there are initial angle thetas (0 with long axis of liquid crystal molecule
< θ < 90 °), incident light, which enters liquid crystal layer, can occur birefringent, and light intensity of incident light is divided into two, and angle theta is in adjustable extent
Bigger, the birefringence level of incident light is bigger, and the negative liquid crystal reflective spatial light modulator works in amplitude tune at this time
Molding formula.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of negative liquid crystal reflective spatial light modulator provided in an embodiment of the present invention.
Attached drawing 2 is negative liquid crystal reflective spatial light modulator phase-only modulation mode tripping in provided in an embodiment of the present invention
Light phase is penetrated with the relationship of voltage change.
Attached drawing 3 be under negative liquid crystal reflective spatial light modulator amplitude modulation mode provided in an embodiment of the present invention (θ=
45 °) reflectivity of incident light with voltage change relationship.
Shown by reference numeral in above-mentioned attached drawing are as follows:
1 polarizing film, 2 top glass substrates, transparent flat electrode on 3,4 upper oriented layers, 5 liquid crystal layers, 6 lower oriented layers, 7 reflecting layer, 8
Lower glass substrate.
Specific embodiment
To enable those skilled in the art to be further understood that the present invention, this hair is explained in detail below in conjunction with attached drawing
Bright specific embodiment.It should be noted that attached drawing is only for the purpose of description, and map not according to original size.
The structural schematic diagram of the negative liquid crystal reflective spatial light modulator provided in an embodiment of the present invention of attached drawing 1, the negativity
Liquid crystal reflective spatial light modulator include polarizing film, top glass substrate, upper transparent flat electrode, upper oriented layer, liquid crystal layer, under
Oriented layer, reflecting layer, lower glass substrate；Liquid crystal layer uses the nematic liquid crystal of negativity, and vertically oriented, with a thickness of d；Institute
Stating polarizing film is rotatable type polarizing film with a scale, i.e. the polarization direction of polarizing film is controllable, and rotatory polarization piece realizes amplitude modulation
With the switching of phase-only modulation；The upper transparent flat electrode is made of transparent conductive material；The reflecting layer uses
The aluminium film of high reflectance makes, and surface is made of diffusive reflective film, and driving voltage is applied on metallic reflector；?
When applying voltage on metallic reflector, liquid crystal molecule can gradually be parallel to lower glass substrate；When long axis of liquid crystal molecule and polarization
When the polarization axle of piece is parallel, the polarised light into liquid crystal layer is propagated along the optical axis direction of liquid crystal molecule, and incident light is not sent out
Life is birefringent, changes the voltage being applied on metallic reflector, only changes the phase of incident light, the negative liquid crystal is anti-at this time
The formula spatial light modulator of penetrating works in pure phase bit pattern；When rotatory polarization piece, changes the polarization direction of polarizing film, make incident light
There are initial angle theta (0 < θ < 90 °), incident light, which enters liquid crystal layer, can occur birefringent for polarization direction and long axis of liquid crystal molecule, enter
It penetrates light light intensity to be divided into two, and angle theta is bigger in adjustable extent, the birefringence level of incident light is bigger, described at this time
Negative liquid crystal reflective spatial light modulator works in amplitude modulation mode.
The characterisitic parameter of negative liquid crystal material used in the present embodiment are as follows: dielectric coefficient Δ ε=- 8.2, the material of liquid crystal
Refractive index is no=1.6, ne=1.4763, lambda1-wavelength λ=550nm, d=5 μm of thickness of liquid crystal layer.
Attached drawing 2 is negative liquid crystal reflective spatial light modulator phase-only modulation mode tripping in provided in an embodiment of the present invention
The phase of light is penetrated with the relationship of voltage change, rotatory polarization piece, direction of the polarizing film light transmission shaft relative to top glass substrate at this time
It is 0 °.From attached drawing 2 as can be seen that when driving voltage is less than 10VrmsWhen, the variation of incident light phase is very bright with the variation of voltage
It is aobvious, when voltage is greater than 10VrmsWhen, liquid crystal layer gradually tends to be saturated relative to the refractive index of incident light, the phase of incident light accumulation
Tend to saturation.When drive voltages are 1VrmsWhen, incident light is 53.69 π in the phase that liquid crystal layer is accumulated, when driving voltage is
16VrmsWhen, incident light is 60.15 π in the phase that liquid crystal layer is accumulated, and phase-modulation range is 0~6.46 π, is realized a wide range of
Phase-modulation.In addition, o light and the phase that e light is accumulated are always consistent, it was demonstrated that incident light with the variation of driving voltage
Do not occur into liquid crystal layer birefringent, the reflectivity of incident light is constant always, the negative liquid crystal Reflective spatial light modulation
Device can be realized phase-only modulation.
Attached drawing 3 is incident under negative liquid crystal reflective spatial light modulator amplitude modulation mode provided in an embodiment of the present invention
Relationship of the reflectivity of light with voltage change, rotatory polarization piece, at this time direction of the polarizing film light transmission shaft relative to top glass substrate
It is 45 °.From attached drawing 3 as can be seen that when driving voltage is less than 10VrmsWhen, the negative liquid crystal reflective spatial light modulator
Reflectivity to incident light is 95%, and the variation of light intensity of incident light degree is unobvious with the variation of voltage.When driving voltage is greater than
10VrmsWhen, the negative liquid crystal reflective spatial light modulator is gradually reduced the reflectivity of incident light, emergent light luminous intensity
It is gradually reduced, when driving voltage is 16VrmsWhen, reflectivity of the negative liquid crystal reflective spatial light modulator to incident light
It is 12%, emergent light light intensity reaches minimum.It can be seen that driving voltage from 10V from attached drawing 3rmsTo 16Vrms, reflectivity changes model
Enclose is 0~83%.The negative liquid crystal reflective spatial light modulator can carry out continuous modulation to the amplitude of incident light, and
And it can be realized larger range amplitude modulation.
The above description is only a preferred embodiment of the present invention, however, the present invention is not limited thereto embodiment.The common skill of this field
Art personnel should be appreciated that in the case where not departing from the spirit and scope of the present invention being defined by the claims to its shape
The various changes that formula and details are made should all belong in the scope of the present invention.
Claims (4)
1. a kind of negative liquid crystal reflective spatial light modulator include polarizing film, top glass substrate, upper transparent flat electrode, on take
To layer, liquid crystal layer, lower oriented layer, reflecting layer, lower glass substrate；Liquid crystal layer uses dielectric coefficient size for the negativity liquid of negative
Crystalline substance, and liquid crystal layer is vertically oriented relative to upper lower glass substrate；Reflection is placed on above lower glass substrate.
2. a kind of negative liquid crystal reflective spatial light modulator according to claim 1, characterized in that polarizing film is that band is carved
Rotatable type polarizing film is spent, the polarization direction of polarizing film is controllable.
3. a kind of negative liquid crystal reflective spatial light modulator according to claim 1, characterized in that amplitude modulation mode
Switching with phase-only modulation mode is realized by rotatory polarization piece.
4. a kind of negative liquid crystal reflective spatial light modulator according to claim 1, characterized in that reflecting layer is using high
The metal film production of reflectivity, driving voltage are applied on reflecting layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811239636.6A CN109212796A (en) | 2018-10-24 | 2018-10-24 | A kind of negative liquid crystal reflective spatial light modulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811239636.6A CN109212796A (en) | 2018-10-24 | 2018-10-24 | A kind of negative liquid crystal reflective spatial light modulator |
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| CN109212796A true CN109212796A (en) | 2019-01-15 |
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| CN201811239636.6A Pending CN109212796A (en) | 2018-10-24 | 2018-10-24 | A kind of negative liquid crystal reflective spatial light modulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113348497A (en) * | 2019-01-18 | 2021-09-03 | 杜比实验室特许公司 | Attenuated wavefront determination for noise reduction |
| WO2022088203A1 (en) * | 2020-10-28 | 2022-05-05 | 广州铁路职业技术学院（广州铁路机械学校） | Tunable terahertz signal deflector and preparation method therefor |
| WO2023192320A1 (en) * | 2022-03-31 | 2023-10-05 | Meta Platforms Technologies, Llc | Configurable multifunctional display panel |
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| US20180059490A1 (en) * | 2016-08-24 | 2018-03-01 | Liqxtal Technology Inc. | Electrically tunable optical phase modulation element |
| CN108681129A (en) * | 2018-07-11 | 2018-10-19 | 上海交通大学 | A kind of non-dependent silicon-based liquid crystal device of polarization |
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| CN1425942A (en) * | 2001-12-11 | 2003-06-25 | 富士通显示技术株式会社 | Reflective liquid crystal display and its producing process |
| CN1791828A (en) * | 2003-05-16 | 2006-06-21 | 皇家飞利浦电子股份有限公司 | Optical modulation method for a liquid crystal layer and liquid crystal device using the method |
| JP2008070567A (en) * | 2006-09-13 | 2008-03-27 | Ricoh Co Ltd | Display device |
| CN101779168A (en) * | 2007-06-13 | 2010-07-14 | 视瑞尔技术公司 | Device for amplitude and phase modulation of light |
| CN101369067A (en) * | 2008-10-10 | 2009-02-18 | 深圳华为通信技术有限公司 | LCD device and terminal |
| CN105676498A (en) * | 2016-03-23 | 2016-06-15 | 北京航空航天大学 | Amplitude modulation method and device for pure-phase spatial light modulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113348497A (en) * | 2019-01-18 | 2021-09-03 | 杜比实验室特许公司 | Attenuated wavefront determination for noise reduction |
| CN113348497B (en) * | 2019-01-18 | 2023-11-28 | 杜比实验室特许公司 | Attenuated wavefront determination for noise reduction |
| WO2022088203A1 (en) * | 2020-10-28 | 2022-05-05 | 广州铁路职业技术学院（广州铁路机械学校） | Tunable terahertz signal deflector and preparation method therefor |
| WO2023192320A1 (en) * | 2022-03-31 | 2023-10-05 | Meta Platforms Technologies, Llc | Configurable multifunctional display panel |
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