CN105652487A - Metal nano-particle doped liquid crystal optical switch as well as preparation method and application method thereof - Google Patents
Metal nano-particle doped liquid crystal optical switch as well as preparation method and application method thereof Download PDFInfo
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- CN105652487A CN105652487A CN201610245863.4A CN201610245863A CN105652487A CN 105652487 A CN105652487 A CN 105652487A CN 201610245863 A CN201610245863 A CN 201610245863A CN 105652487 A CN105652487 A CN 105652487A
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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
- G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect
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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
- G02F1/1326—Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides
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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
- G02F1/35—Non-linear optics
- G02F1/3515—All-optical modulation, gating, switching, e.g. control of a light beam by another light beam
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- Crystallography & Structural Chemistry (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract
The invention provides a metal nano-particle doped liquid crystal optical switch. The liquid crystal optical switch comprises quartz substrates, wherein a chamber with an opening at one end is formed by the two quartz substrates; the peripheries of the quartz substrates are completely hotly sealed by adopting hot sealing layers; an inner wall of the chamber is coated with an ITO (Indium Tin Oxide) thin film layer on which metal nano-articles are coated; the chamber is filled with liquid crystal molecules and metal nano-particles modified by a surfactant; and after the liquid crystal molecules and the metal nano-particles modified by the surfactant are filled, the opening end of the chamber is hotly sealed. According to the metal nano-particle doped liquid crystal optical switch, the quartz substrates are illuminated through pumping light and a surface plasmon resonance effect on the metal nano-particles is caused, so that the orientation of the liquid crystal molecules is deflected, and transmission light intensity of signal light is changed, and furthermore, a switching effect is formed; and in the presence of the metal nano-particles, the threshold-value light intensity of the liquid crystal optical switch is remarkably alleviated, and a responding speed of the switch is also remarkably improved, so that the metal nano-particle doped liquid crystal optical switch has a considerable application prospect in full-light devices and full-light communication in the future.
Description
Technical field
This device relates to liquid crystal optical switch, is specifically related to liquid crystal optical switch and preparation method thereof and the using method of the doping of a kind of metal nanoparticle.
Background technology
Along with developing rapidly of mankind's science and technology, optical communication field is also flourish. Photon all far wins electronics in transmission speed or information carrying amount, and various all-optical device arise at the historic moment. All-optical switch is wherein most commonly seen all-optical device, and liquid crystal optical switch is again the one being most widely used in all-optical switch.
Liquid crystal optical switch adopts the orientations that a branch of pump light controls liquid crystal molecule to change the transmitted light intensity of detection light, thus realizing on-off action. Switching threshold light intensity and switch response speed are most important two parameters of all-optical switch. The switching threshold of pure liquid crystal all-optical switch is significantly high, and response speed is also slow, thus derives a lot of improvements, and what wherein have the greatest impact is be doped into dye molecule in liquid crystal, and its photoswitch threshold value can have the reduction of 2 magnitudes. But dye molecule itself exists photobleaching and photo damage, service life is not long, is difficult to there is breakthrough progress again in the short time; Can also suitably reduce switching threshold by improving the character of liquid crystal material and improve response speed, but neither it can be seen that bright and clear prospect within the short time to the searching of liquid crystal new material.
Summary of the invention
For problems of the prior art, the present invention provides liquid crystal optical switch that a kind of metal nanoparticle adulterates and preparation method thereof and using method, to reduce all-optical switch threshold value, switch response speed can be improved, have fabulous application potential and prospect at photoswitch and optical communication field.
For achieving the above object, the present invention is by the following technical solutions:
A kind of liquid crystal optical switch of metal nanoparticle doping, this liquid crystal optical switch includes quartz base plate, two pieces of quartz base plates form the chamber of one end open, the surrounding hot sealing layer of quartz base plate seals closing completely, the inwall of described chamber is all coated with ito thin film layer, described ito thin film layer is coated with metal nano-particle layer, described chamber is inoculated with liquid crystal molecule and through surfactant modified metal nanoparticle, pouring into liquid crystal molecule and after surfactant modified metal nanoparticle, the opening heat-sealing of chamber is closed.
The thickness of described metal nano-particle layer is 10-80nm.
In described metal nano-particle layer, metal nanoparticle is at chamber inner wall monolayer distribution.
Described metal nanoparticle is 75-78% in the coverage rate of chamber inner wall monolayer distribution.
Described metal nano-particle layer is gold nano grain layer, is gold nano grain through surfactant modified metal nanoparticle.
Described metal nano-particle layer is Silver nano-particle layer, is silver nano-grain through surfactant modified metal nanoparticle.
The width of described chamber is 5 microns to 300 microns, and described quartz base plate thickness is millimeter magnitude.
The preparation method of the liquid crystal optical switch of a kind of metal nanoparticle doping, comprises the following steps:
The first step, by the surrounding of quartz base plate by sealing the chamber closing one one end open of composition, the inner wall surface at described chamber is all coated with transparent ITO conducting film;
Second step, by a part of metal nanoparticle by physisorption dispersed deposition on ITO conducting film surface, metal nanoparticle forms compact arranged monolayer distribution in the distribution of ITO conducting film monolayer surface, single-layer metal nano-particle dense distribution but be not overlapped mutually, the metal nanoparticle coverage rate on ITO conducting film surface is not less than 30%;
3rd step, the decorative layer that another part metal nanoparticle surface is wrapped up entirely through surfactant modified formation, then the metal nanoparticle after modification is added in liquid crystal molecule and pours in chamber, form the spheroid wrapped up for core liquid crystal molecule with metal nanoparticle in the chamber, after being protected by liquid crystal molecule, dispersed distribution between metal nanoparticle; Namely metal nanoparticle just seldom has the chance that collision is reunited again, thus metal nanoparticle can be well dispersed among liquid crystal, liquid crystal molecule is arranged in parallel in the cavities by rubbing effect, its quality aligned depends on the anchorage force size between liquid crystal molecule and ito thin film, anchorage force is more big, it is more good to align, and the resistance that liquid crystal molecule rotates is more big;
4th step, by sealing the opening closing chamber.
Described surfactant carries out chelating by molecule of functional group one end and metal nanoparticle, the molecule of functional group other end and liquid crystal molecule carry out chelating, thus after metal nanoparticle surface forms the surfactant layer of monolayer, being cladded with lid layer liquid crystal molecule at surfactant layer.
The using method of the liquid crystal optical switch of a kind of metal nanoparticle doping, comprises the following steps,
The first step, adopts detection light as flashlight, adopts pump light as controlling light, and described detection light and pump light are radiated at the outer surface of quartz base plate simultaneously, and the hot spot of pump light covers the hot spot of detection light; Incidence end at flashlight arranges the polarizer, and the exit end at flashlight arranges analyzer, and the polarization direction of the described polarizer and analyzer is mutually perpendicular to; When not having pump light to irradiate, flashlight becomes polarized light by the polarizer, arrives analyzer after liquid crystal shutter, and owing to the polarizer is vertical with the polarization direction of analyzer, flashlight cannot pass through analyzer, and now switch is closed mode;
Second step, the rotating torque being applied on liquid crystal molecule when pump light overcomes the quartz base plate anchorage force to liquid crystal molecule, the orientation of liquid crystal molecule changes, so that the polarization state of flashlight is become elliptical polarization by linear polarization, after now flashlight arrives analyzer, partial intensities being had to pass through, now switch is opening, realize the function of liquid crystal optical switch, depend on the power of pump light through the size of light intensity.
Compared with prior art, advantages of the present invention is: 1. overall structure of the present invention is simple, and device is simple and clear, compact conformation, it is easy to makes, has sealed the effect of encapsulated liquid crystals molecule, and ito thin film is for carrying out orientation orientation to liquid crystal molecule;2. be deposited on ito thin film by metal nanoparticle respectively, part metals nano-particle is dissolved in liquid crystal molecule, the surface plasmon resonance effect of metal nanoparticle can be utilized when pump light irradiates, reduce the liquid crystal molecule anchorage force on ito thin film surface, switching threshold can substantially reduce, also accelerate the liquid crystal molecule response speed to electric field simultaneously, experiment finds to adopt 532 nanometers of light as pump light, its switching threshold can reduce 1-2 magnitude, and response speed can improve more than 2 times; 3. carry out surfactant modified on metal nanoparticle surface, it is ensured that metal nanoparticle is dispersed and distributed when mixing with liquid crystal molecule, reduce the resistance between liquid crystal molecule, make the direction of liquid crystal molecule be easily changed; 4. it is currently and controls optical switch by electricity conduction, the present invention controls optical switch by luminous energy, it is achieved photocontrol light, and the present invention can adopt different metal materials and nanostructured, applying also for Most current liquid crystal material, its potential application in all-optical switch field is huge.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the enlarged drawing of a-quadrant in Fig. 1.
Detailed description of the invention
Technical scheme is done in conjunction with accompanying drawing and specific embodiment and is further elaborated by we below; liquid crystal optical switch in the hope of being more fully apparent from understanding metal nanoparticle doping and preparation method thereof and using method, but can not limit the scope of the invention with this.
Embodiment 1
The liquid crystal optical switch of the present embodiment metal nanoparticle doping, this liquid crystal optical switch includes quartz base plate 1, described quartz base plate thickness is millimeter magnitude, two pieces of quartz base plates form the chamber 2 of one end open, the thickness that in the width of described chamber and chamber, liquid crystal is filled is 5 microns, the surrounding hot sealing layer 3 of quartz base plate seals closing completely, the inwall of described chamber is all coated with ito thin film layer 4, described ito thin film layer is coated with metal nano-particle layer, described chamber 2 is inoculated with liquid crystal molecule 5 and through surfactant modified metal nanoparticle 6, pour into liquid crystal molecule and after surfactant modified metal nanoparticle, opening 7 heat-sealing of chamber is closed.
In the present embodiment, metal nano-particle layer is gold nano grain layer, and the thickness of gold nano grain layer is 10nm; Being gold nano grain through surfactant modified metal nanoparticle, the particle diameter of gold nano grain is 30nm,
As preferably, in the present embodiment gold nano grain layer, gold nano grain is at chamber inner wall monolayer distribution, and the coverage rate of monolayer distribution is 75%.
The preparation method of the liquid crystal optical switch of the present embodiment metal nanoparticle doping, comprises the following steps:
The first step, by the surrounding of quartz base plate by sealing the chamber closing one one end open of composition, the inner wall surface at described chamber is all coated with transparent ITO conducting film;
Second step, by a part of gold nano grain by physisorption dispersed deposition on ITO conducting film surface, gold nano grain forms compact arranged monolayer distribution in the distribution of ITO conducting film monolayer surface, single layer of gold nano-particle dense distribution but be not overlapped mutually, the gold nano grain coverage rate on ITO conducting film surface is 75%;
3rd step, the decorative layer that another part gold nano grain surface is wrapped up entirely through surfactant modified formation, then the gold nano grain after modification is added in liquid crystal molecule and pours in chamber, form the spheroid wrapped up for core liquid crystal molecule with gold nano grain in the chamber, described surfactant carries out chelating by molecule of functional group one end and gold nano grain, the molecule of functional group other end and liquid crystal molecule carry out chelating, thus after gold nano grain surface forms the surfactant layer of monolayer, it is cladded with lid layer liquid crystal molecule at surfactant layer, after being protected by liquid crystal molecule, dispersed distribution between gold nano grain,What the selection gist of the present embodiment the 3rd Bu Zhong functional group was gold nano grain surface for the surfactant modified is electrical, cover because gold nano grain surface is trisodium citrate, therefore whole granule is with negative charge, so the functional group with positive charge need to be chosen carry out chelating, such as with the group of S and the positive charge of atom N, in the present embodiment, the concrete surfactant adopted is 4-Sulfanylphenyl-4-[4-(octyloxy) phenyl] benzoate (SOPB) Thiol;
4th step, by sealing the opening closing chamber.
Quartz base plate described in the present embodiment is commercial product common on market, described hot sealing layer is heat-curable glue, described ito thin film is indium tin metal sull, described gold nano grain diameter is 30 nanometers, obtained by trisodium citrate reduction chlorauric acid solution, deposit ito thin film surface again through physisorption; Described liquid crystal is nematic phase 5CB liquid crystal, and in liquid crystal, the gold nano grain of doping is by being dissolved among 5CB liquid crystal after gold nano grain is carried out finishing. Liquid crystal molecule is contacted by grappling effect and ito thin film, and make liquid crystal molecule entirety be perpendicular to ito thin film surface alignment by this grappling effect, principle to make liquid crystal molecule generation unitary rotation, firstly the need of the anchorage force overcoming the ito thin film liquid crystal molecule to contacting with it, and pump light irradiation is additionally provided a moment exactly on liquid crystal molecule, for overcoming the impact of anchorage force.
The using method of the liquid crystal optical switch of the present embodiment metal nanoparticle doping, it is characterised in that comprise the following steps,
The first step, adopt detection light 8 as flashlight, the continuous light that wavelength is 1064 nanometers of detection light, adopt pump light 9 as controlling light, pump light is wavelength is the continuous light of 532 nanometers, described detection light and pump light are radiated at the outer surface of quartz base plate simultaneously, and the hot spot of pump light covers the hot spot of detection light; Incidence end at flashlight arranges the polarizer 10, and the exit end at flashlight arranges analyzer 11, and the polarization direction of the described polarizer and analyzer is mutually perpendicular to; When not having pump light to irradiate, flashlight becomes polarized light by the polarizer, arrives analyzer after liquid crystal shutter, and owing to the polarizer is vertical with the polarization direction of analyzer, flashlight cannot pass through analyzer, and now switch is closed mode;
Second step, the rotating torque being applied on liquid crystal molecule when pump light overcomes the quartz base plate anchorage force to liquid crystal molecule, the orientation of liquid crystal molecule changes, so that the polarization state of flashlight is become elliptical polarization by linear polarization, after now flashlight arrives analyzer, partial intensities will be had to pass through, now switch is opening, realize the function of liquid crystal optical switch, the power of pump light is depended on through the size of light intensity, wherein first pump light is irradiated to the gold nano grain being deposited on ito thin film, cause the surface plasmon resonance effect of this part gold nano grain, this effect can be greatly enhanced the local light of gold nano grain near surface, thus the rotating torque that pump light is applied on those liquid crystal molecules near gold nano grain is greatly increased, having only to more weak pump light just can make the liquid crystal molecule contacted with ito thin film deflect, when this partial liquid crystal molecular band hydrodynamic crystalline substance entirety rotates subsequently, owing to liquid crystal entirety is doped with gold nano grain, a lot of liquid crystal molecules can both experience the enhancing of the rotating torque that pump light applies, thus for overall liquid crystal molecule, rotate and also will become to be more prone to, required pumping light intensity naturally also reduces accordingly, simultaneously, existence due to gold nano grain, it is that liquid crystal molecule or the overall liquid crystal molecule on ITO surface is all easier to rotate, thus to the response speed of pump light just faster, thus also improving the response speed of this liquid crystal optical switch.
Can adopting different size of gold nano grain in the present embodiment, distribution is monolayer dense distribution, the gold nano grain amplification to pump light, in Table 1:
Table 1
| Gold nano grain size (nanometer) | Pump light amplification |
| 10 | 11 |
| 30 | 32 |
| 50 | 59 |
Embodiment 2
The liquid crystal optical switch of the present embodiment metal nanoparticle doping, this liquid crystal optical switch includes quartz base plate 1, described quartz base plate thickness is millimeter magnitude, two pieces of quartz base plates form the chamber 2 of one end open, the thickness that in the width of described chamber and chamber, liquid crystal is filled is 200 microns, the surrounding hot sealing layer 3 of quartz base plate seals closing completely, the inwall of described chamber is all coated with ito thin film layer 4, described ito thin film layer is coated with Silver nano-particle layer, described chamber 2 is inoculated with liquid crystal molecule 5 and through surfactant modified silver nano-grain, pour into liquid crystal molecule and after surfactant modified silver nano-grain, opening 7 heat-sealing of chamber is closed.
In the present embodiment, metal nano-particle layer is Silver nano-particle layer, and the thickness of Silver nano-particle layer is 50nm; Being silver nano-grain through surfactant modified metal nanoparticle, the particle diameter of silver nano-grain is 50nm.
As preferably, in the present embodiment Silver nano-particle layer, silver nano-grain is at chamber inner wall monolayer distribution, and the coverage rate of monolayer distribution is 78%.
The preparation method of the liquid crystal optical switch of the present embodiment metal nanoparticle doping, comprises the following steps:
The first step, by the surrounding of quartz base plate by sealing the chamber closing one one end open of composition, the inner wall surface at described chamber is all coated with transparent ITO conducting film;
Second step, by a part of silver nano-grain by physisorption dispersed deposition on ITO conducting film surface, silver nano-grain forms compact arranged monolayer distribution in the distribution of ITO conducting film monolayer surface, single silver nano-particle dense distribution but be not overlapped mutually, the silver nano-grain coverage rate on ITO conducting film surface is 78%;
3rd step, the decorative layer that another part silver nano-grain surface is wrapped up entirely through surfactant modified formation, then the silver nano-grain after modification is added in liquid crystal molecule and pours in chamber, form the spheroid wrapped up for core liquid crystal molecule with silver nano-grain in the chamber, described surfactant carries out chelating by molecule of functional group one end and silver nano-grain, the molecule of functional group other end and liquid crystal molecule carry out chelating, thus after silver nano-grain surface forms the surfactant layer of monolayer, it is cladded with lid layer liquid crystal molecule at surfactant layer, after being protected by liquid crystal molecule, dispersed distribution between silver nano-grain, what the selection gist of the present embodiment the 3rd Bu Zhong functional group was silver nano-grain surface for the surfactant modified is electrical, cover because silver nano-grain surface is trisodium citrate, therefore whole granule is with negative charge, so the functional group with positive charge need to be chosen carry out chelating, such as with the group of S and the positive charge of atom N, in the present embodiment, the concrete surfactant adopted is 4-Sulfanylphenyl-4-[4-(octyloxy) phenyl] benzoate (SOPB) Thiol,
4th step, by sealing the opening closing chamber.
Quartz base plate described in the present embodiment is commercial product common on market, described hot sealing layer is heat-curable glue, described ito thin film is indium tin metal sull, described gold nano grain diameter is 20 nanometers, obtained by trisodium citrate reduction silver nitrate solution, deposit ito thin film surface again through physisorption;Described liquid crystal is nematic phase 5CB liquid crystal, in liquid crystal, the silver nano-grain of doping is by being dissolved among 5CB liquid crystal after silver nano-grain is carried out finishing, liquid crystal molecule is contacted by grappling effect and ito thin film, and make liquid crystal molecule entirety be perpendicular to ito thin film surface alignment by this grappling effect, principle to make liquid crystal molecule generation unitary rotation, firstly the need of the anchorage force overcoming the ito thin film liquid crystal molecule to contacting with it, and pump light irradiation is additionally provided a moment exactly on liquid crystal molecule, for overcoming the impact of anchorage force.
The using method of the liquid crystal optical switch of the present embodiment metal nanoparticle doping, it is characterised in that comprise the following steps,
The first step, adopt detection light 8 as flashlight, detection optical wavelength is the continuous light of 1064 nanometers, adopt pump light 9 as controlling light, pump light is wavelength is the continuous light of 400 nanometers, described detection light and pump light are radiated at the outer surface of quartz base plate simultaneously, and the hot spot of pump light covers the hot spot of detection light; Incidence end at flashlight arranges the polarizer 10, and the exit end at flashlight arranges analyzer 11, and the polarization direction of the described polarizer and analyzer is mutually perpendicular to; When not having pump light to irradiate, flashlight becomes polarized light by the polarizer, arrives analyzer after liquid crystal shutter, and owing to the polarizer is vertical with the polarization direction of analyzer, flashlight cannot pass through analyzer, and now switch is closed mode;
Second step, the rotating torque being applied on liquid crystal molecule when pump light overcomes the quartz base plate anchorage force to liquid crystal molecule, the orientation of liquid crystal molecule changes, so that the polarization state of flashlight is become elliptical polarization by linear polarization, after now flashlight arrives analyzer, partial intensities will be had to pass through, now switch is opening, realize the function of liquid crystal optical switch, the power of pump light is depended on through the size of light intensity, wherein first pump light is irradiated to the silver nano-grain being deposited on ito thin film, cause the surface plasmon resonance effect of this part silver nano-grain, this effect can be greatly enhanced the local light of silver nano-grain near surface, thus the rotating torque that pump light is applied on those liquid crystal molecules near silver nano-grain is greatly increased, having only to more weak pump light just can make the liquid crystal molecule contacted with ito thin film deflect, when this partial liquid crystal molecular band hydrodynamic crystalline substance entirety rotates subsequently, owing to liquid crystal entirety is doped with silver nano-grain, a lot of liquid crystal molecules can both experience the enhancing of the rotating torque that pump light applies, thus for overall liquid crystal molecule, rotate and also will become to be more prone to, required pumping light intensity naturally also reduces accordingly, simultaneously, existence due to silver nano-grain, it is that liquid crystal molecule or the overall liquid crystal molecule on ITO surface is all easier to rotate, thus to the response speed of pump light just faster, thus also improving the response speed of this liquid crystal optical switch.
Can adopting different size of silver nano-grain in the present embodiment, distribution is monolayer dense distribution, and the silver nano-grain amplification to pump light, in Table 2.
Table 2
| Silver nano-grain size (nanometer) | Pump light amplification |
| 10 | 8 |
| 30 | 28 |
| 50 | 55 |
Claims (10)
1. the liquid crystal optical switch of a metal nanoparticle doping, it is characterized in that, this liquid crystal optical switch includes quartz base plate (1), two pieces of quartz base plates form the chamber (2) of one end open, the surrounding hot sealing layer (3) of quartz base plate seals closing completely, the inwall of described chamber is all coated with ito thin film layer (4), described ito thin film layer is coated with metal nano-particle layer, described chamber (2) is inoculated with liquid crystal molecule (5) and through surfactant modified metal nanoparticle (6), pour into liquid crystal molecule and after surfactant modified metal nanoparticle, opening (7) heat-sealing of chamber is closed.
2. the liquid crystal optical switch of metal nanoparticle according to claim 1 doping, it is characterised in that the thickness of described metal nano-particle layer is 10-80nm.
3. the liquid crystal optical switch of metal nanoparticle according to claim 1 doping, it is characterised in that in described metal nano-particle layer, metal nanoparticle is at chamber inner wall monolayer distribution.
4. the liquid crystal optical switch of metal nanoparticle according to claim 3 doping, it is characterised in that described metal nanoparticle is 75-78% in the coverage rate of chamber inner wall monolayer distribution.
5. the liquid crystal optical switch of metal nanoparticle according to claim 1 doping, it is characterised in that described metal nano-particle layer is gold nano grain layer, is gold nano grain through surfactant modified metal nanoparticle.
6. the liquid crystal optical switch of metal nanoparticle according to claim 1 doping, it is characterised in that described metal nano-particle layer is Silver nano-particle layer, is silver nano-grain through surfactant modified metal nanoparticle.
7. the liquid crystal optical switch of metal nanoparticle according to claim 1 doping, it is characterised in that the width of described chamber is 5 microns to 300 microns, and described quartz base plate thickness is millimeter magnitude.
8. the preparation method of the liquid crystal optical switch of the metal nanoparticle doping described in a claim 7, it is characterised in that comprise the following steps:
The first step, by the surrounding of quartz base plate by sealing the chamber closing one one end open of composition, the inner wall surface at described chamber is all coated with transparent ITO conducting film;
Second step, by a part of metal nanoparticle by physisorption dispersed deposition on ITO conducting film surface, metal nanoparticle forms compact arranged monolayer distribution in the distribution of ITO conducting film monolayer surface, single-layer metal nano-particle dense distribution but be not overlapped mutually, the metal nanoparticle coverage rate on ITO conducting film surface is not less than 30%;
3rd step, the decorative layer that another part metal nanoparticle surface is wrapped up entirely through surfactant modified formation, then the metal nanoparticle after modification is added in liquid crystal molecule and pours in chamber, form the spheroid wrapped up for core liquid crystal molecule with metal nanoparticle in the chamber, after being protected by liquid crystal molecule, dispersed distribution between metal nanoparticle;
4th step, by sealing the opening closing chamber.
9. the preparation method of the liquid crystal optical switch of metal nanoparticle according to claim 8 doping, it is characterized in that, described surfactant carries out chelating by molecule of functional group one end and metal nanoparticle, the molecule of functional group other end and liquid crystal molecule carry out chelating, thus after metal nanoparticle surface forms the surfactant layer of monolayer, being cladded with lid layer liquid crystal molecule at surfactant layer.
10. the using method of the liquid crystal optical switch of the metal nanoparticle doping described in a claim 7, it is characterised in that comprise the following steps,
The first step, adopts detection light (8) as flashlight, adopts pump light (9) as controlling light, and described detection light and pump light are radiated at the outer surface of quartz base plate simultaneously, and the hot spot of pump light covers the hot spot of detection light; Incidence end at flashlight arranges the polarizer (10), and the exit end at flashlight arranges analyzer (11), and the polarization direction of the described polarizer (10) and analyzer (11) is mutually perpendicular to; When not having pump light to irradiate, flashlight becomes polarized light by the polarizer, arrives analyzer after liquid crystal shutter, and owing to the polarizer is vertical with the polarization direction of analyzer, flashlight cannot pass through analyzer, and now switch is closed mode;
Second step, the rotating torque being applied on liquid crystal molecule when pump light overcomes the quartz base plate anchorage force to liquid crystal molecule, the orientation of liquid crystal molecule changes, so that the polarization state of flashlight is become elliptical polarization by linear polarization, after now flashlight arrives analyzer, partial intensities will be had to pass through, and now switch is opening, it is achieved the function of liquid crystal optical switch.
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| US20020145792A1 (en) * | 1996-07-19 | 2002-10-10 | Jacobson Joseph M | Electrophoretic displays using nanoparticles |
| US20060124922A1 (en) * | 2004-12-09 | 2006-06-15 | Seong Hyun Kim | Conductive ink, organic semiconductor transistor using the conductive ink, and method of fabricating the transistor |
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| CN101520565A (en) * | 2009-01-09 | 2009-09-02 | 中国工程物理研究院流体物理研究所 | Quick-response liquid crystal optical switch and preparation method thereof |
| CN102181830A (en) * | 2011-04-12 | 2011-09-14 | 华中科技大学 | Silver nanometer material and application thereof |
| CN104321830A (en) * | 2011-12-22 | 2015-01-28 | 3M创新有限公司 | Electrically conductive article with high optical transmission |
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