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 PDF

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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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liquid crystal
light
optical switch
chamber
metal
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CN201610245863.4A
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Chinese (zh)
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单炯
饶大幸
李小莉
崔勇
高妍琦
马伟新
周士安
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中国工程物理研究院上海激光等离子体研究所
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Priority to CN201610245863.4A priority Critical patent/CN105652487A/en
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    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/132Thermal activation of liquid crystals exhibiting a thermo-optic effect
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/1326Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/35Non-linear optics
    • G02F1/3515All-optical modulation, gating, switching, e.g. control of a light beam by another light beam

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

金属纳米颗粒掺杂的液晶光开关及其制备方法和使用方法 Metal nanoparticles doped liquid crystal light switches and their preparation and use

技术领域 FIELD

[0001] 本装置涉及液晶光开关,具体涉及一种金属纳米颗粒掺杂的液晶光开关及其制备方法和使用方法。 [0001] The present device relates to a liquid crystal optical switch, particularly to a metal nanoparticle-doped liquid crystal light switches and preparation method and use.

背景技术 Background technique

[0002] 随着人类科技的飞速发展,光通信领域也蓬勃发展。 [0002] With the rapid development of human technology, optical communication is also booming. 光子无论在传输速度还是信息携带量方面都远胜电子,各种全光器件应运而生。 Photons in terms of transmission speed or information carrying capacity aspects are far better than electronic, all kinds of all-optical devices came into being. 全光开关是其中最为常见的全光器件, 液晶光开关又是全光开关中应用最为广泛的一种。 All-optical switch is one of the most common of all-optical devices, liquid crystal optical switches is all-optical switch in the most widely used one.

[0003] 液晶光开关采用一束栗浦光控制液晶分子的取向排列来改变探测光的透射光强, 从而实现开关作用。 [0003] Li a bundle of the liquid crystal optical switch pump light control alignment of liquid crystal molecules are arranged to change the transmitted light intensity of the probe light, thereby realizing switching action. 开关阈值光强和开关响应速度是全光开关最重要的两个参数。 Switching threshold intensity and the response speed of switching two all-optical switching is the most important parameters. 纯液晶全光开关的开关阈值很高,并且响应速度也比较慢,因而衍生出很多的改进工作,其中影响最大的是在液晶中掺杂入染料分子,其光开关阈值可以有2个量级的降低。 High switching threshold of pure all-optical switching of the liquid crystal, and the response speed is relatively slow, and thus derived from many of the improvements which the greatest impact is doped into the liquid crystal dye molecules, the light switch threshold may have two orders of magnitude reduced. 然而染料分子本身存在光漂白和光破坏,使用寿命不长,短时间内很难再有突破性的进展;通过改善液晶材料的性质也可以适当降低开关阈值和提高响应速度,然而对液晶新材料的寻找也不是短时间之内可以看到明朗的前景。 However, the presence of the dye molecule itself and the photobleaching light damage, service life is not long, a short time is difficult to have a breakthrough; may be appropriate to reduce the switching threshold and improved properties by improving the response speed of the liquid crystal material, however, new liquid crystal material Looking nor can see bright prospects for a short time.

发明内容 SUMMARY

[0004] 针对现有技术中存在的问题,本发明提供一种金属纳米颗粒掺杂的液晶光开关及其制备方法和使用方法,能够以降低全光开关阈值、提高开关响应速度,在光开关和光通信领域有着极好的应用潜力和前景。 [0004] For the problems in the prior art, the present invention provides a metal nanoparticle-doped liquid crystal light switches and preparation method and use, it is possible to reduce the all-optical switching threshold, switch to improve the response speed, the light switch and optical communications applications with excellent potential and prospects.

[0005] 为实现上述目的,本发明采用以下技术方案: 一种金属纳米颗粒掺杂的液晶光开关,该液晶光开关包括石英基板,两块石英基板形成一端开口的腔室,石英基板的四周用热封层完全热封封闭,所述腔室的内壁上均镀有ΙΤ0 薄膜层,所述ΙΤ0薄膜层上均涂覆有金属纳米颗粒层,所述腔室中灌有液晶分子和经过表面活性剂修饰的金属纳米颗粒,灌入液晶分子和经过表面活性剂修饰的金属纳米颗粒后,腔室的开口端热封封闭。 [0005] To achieve the above object, the present invention employs the following technical solutions: A metal nanoparticle-doped liquid crystal light shutter, the liquid crystal optical switch comprises a quartz substrate, a quartz substrate formed two chambers open at one end, surrounded by a quartz plate heat seal layer is completely closed by heat sealing, on an inner wall of the chamber are coated with a thin layer ΙΤ0, ΙΤ0 the upper film layer is coated with metal nanoparticle layer, filling the chamber through the surface of the liquid crystal molecules and after the active agent-modified metal nanoparticles, the liquid crystal molecules and poured into the surfactant-modified metal nanoparticles, heat-sealing the open end of the chamber is closed.

[0000]所述金属纳米颗粒层的厚度为10_80nm〇 [0000] thickness of the metal nanoparticle layer is 10_80nm〇

[0007] 所述金属纳米颗粒层中金属纳米颗粒在腔室内壁单层分布。 The [0007] metal nanoparticles in the metal nanoparticle layer distribution in the chamber monolayer.

[0008] 所述金属纳米颗粒在腔室内壁单层分布的覆盖率为75-78%。 [0008] The metal nanoparticles distributed in a monolayer coverage of the chamber walls 75-78%.

[0009] 所述金属纳米颗粒层为金纳米颗粒层,经过表面活性剂修饰的金属纳米颗粒为金纳米颗粒。 [0009] The metallic nanoparticle layer is a layer of gold nanoparticles, surfactant-modified metal nanoparticles are gold nanoparticles.

[0010] 所述金属纳米颗粒层为银纳米颗粒层,经过表面活性剂修饰的金属纳米颗粒为银纳米颗粒。 [0010] The metal nanoparticles are silver nanoparticles layer is a layer of surfactant-modified metal nanoparticles are silver nanoparticles.

[0011] 所述腔室的宽度为5微米到300微米,所述石英基板厚度为毫米量级。 [0011] The width of the chamber is 5 to 300 microns, a quartz substrate having a thickness of millimeters.

[0012] -种金属纳米颗粒掺杂的液晶光开关的制备方法,包括以下步骤: 第一步,将石英基板的四周通过热封封闭组成一个一端开口的腔室,在所述腔室的内壁表面均镀有透明的ITO导电膜; 第二步,将一部分金属纳米颗粒通过物理吸附作用分散沉积在ΙΤ0导电膜表面,金属纳米颗粒在ΙΤ0导电膜表面单层分布形成紧密排列的单层分布,单层金属纳米颗粒密集分布但不相互叠加,金属纳米颗粒在ΙΤ0导电膜表面的覆盖率不低于30%; 第三步,将另一部分金属纳米颗粒表面经过表面活性剂修饰形成全包裹的修饰层,然后将修饰后的金属纳米颗粒加入液晶分子中并灌入腔室中,在腔室中形成以金属纳米颗粒为核心液晶分子包裹的球体,受液晶分子保护后,金属纳米颗粒之间分散状分布;即金属纳米颗粒就很少再有碰撞团聚的机会,因而金属纳米颗粒可以很好地 [0012] - preparing a liquid crystal optical switch doped metal nanoparticles, comprising the steps of: a first step, the four weeks quartz substrate by heat sealing to form a closed chamber with one open end, an inner wall of the chamber surfaces are coated with a transparent ITO conductive film; a second step, a portion of the metal nanoparticles dispersed by physical adsorption ΙΤ0 conductive film deposited on the surface of the metal nanoparticles ΙΤ0 conductive film formed surface of the monolayer of closely spaced single layer distribution profile, single-layer metal nanoparticles are densely distributed, but are not superposed on each other, the metal nanoparticles in the conductive film surface coverage of not less than 30% ΙΤ0; a third step, the whole package will be modified another portion of the metal surface of the nanoparticles through the surfactant-modified form layer and then modified after the metal nanoparticles was added and poured into the liquid crystal molecules in the chamber, the metal nanoparticles to form the core of the liquid crystal molecules sphere wrapped in the chamber, the liquid crystal molecules protected metal nanoparticles dispersed among like distribution; i.e., the metal nanoparticles will rarely have the opportunity to collision and agglomeration of the metal nanoparticles and thus can be well 散在液晶之中,液晶分子通过定向摩擦作用在空腔中平行排列,其定向排列的好坏取决于液晶分子和ΙΤ0薄膜之间的锚定力大小,锚定力越大,定向排列越好,液晶分子转动的阻力就越大; 第四步,通过热封封闭腔室的开口端。 Scattered among the liquid crystal, the liquid crystal molecules are arranged in parallel by orienting the friction in the cavity, which depends on the quality of alignment anchoring force between the size of the liquid crystal molecules and ΙΤ0 film, the greater the anchoring force, the better the alignment, rotation of the liquid crystal molecules greater the resistance; a fourth step, by heat-sealing the open end of the closed chamber.

[0013] 所述表面活性剂通过官能团分子一端与金属纳米颗粒进行螯合,官能团分子另一端与液晶分子进行螯合,从而在金属纳米颗粒表面形成单层的表面活性剂层之后,在表面活性剂层外覆盖一层液晶分子。 After [0013] The surfactant is chelated by-functional molecules one end of the metal nanoparticles, the other end of the multifunctional molecule and the liquid crystal molecules chelation, thereby forming a surfactant layer monolayer on the particle surface of the metal nano, the surfactant an outer layer of liquid crystal molecules agent layer.

[0014] -种金属纳米颗粒掺杂的液晶光开关的使用方法,包括以下步骤, 第一步,采用探测光作为信号光,采用栗浦光作为控制光,所述探测光和栗浦光同时照射在石英基板的外表面,栗浦光的光斑覆盖探测光的光斑;在信号光的入射端设置起偏器, 在信号光的出射端设置检偏器,所述起偏器和检偏器的偏振方向相互垂直;当没有栗浦光照射时,信号光通过起偏器变成偏振光,经过液晶开关之后到达检偏器,由于起偏器和检偏器的偏振方向垂直,信号光无法通过检偏器,此时开关为关闭状态; 第二步,当栗浦光施加在液晶分子上的转动力矩克服石英基板对液晶分子的锚定力, 液晶分子的排列方向发生改变,从而使信号光的偏振状态由线偏振变成椭圆偏振,此时信号光到达检偏器之后,将有部分强度可以通过,此时开关为开启状态,实现液晶光开关的 [0014] - metal nanoparticle doping method using the liquid crystal optical switch, comprising the steps, the first step using the detection light as signal light, pump light chestnut employed as the control light, the probe light and pump light are irradiated simultaneously Li quartz the outer surface of the substrate, the spot Li pump light spot covering the probe light; polarizer disposed from the entrance end of the signal light, the signal light exit end disposed analyzer, the polarizing direction of the polarizer and analyzer are perpendicular to each ; Li pump when no light irradiation, the signal light becomes polarized by the polarizer, the liquid crystal switch after reaching the analyzer, since the direction of polarization from the vertical polarizer and an analyzer, the signal light can not pass through the analyzer, then switch is closed; the second step, when the rotational torque of Li pump light to the liquid crystal molecules is applied to a quartz substrate anchoring force against the liquid crystal molecules, the alignment direction of liquid crystal molecules is changed, so that the polarization state of signal light becomes a linear polarization elliptically polarized light reaches after this time the signal analyzer, the strength of the part can, at this time the switch ON state, the liquid crystal optical switch achieve 功能,透过光强的大小取决于栗浦光的强弱。 Function, through the strong light depends on the strength of Li Pu light.

[0015] 与现有技术相比,本发明的优点为:①本发明整体结构简单,装置简单明了,结构紧凑,易于制作,热封起密封液晶分子的作用,ΙΤ0薄膜用于对液晶分子进行取向定向作用; ②分别将金属纳米颗粒沉积在ΙΤ0薄膜上、部分金属纳米颗粒溶解在液晶分子中,都可以在栗浦光照射时利用金属纳米颗粒的表面等离激元共振效应,降低液晶分子在ΙΤ0薄膜表面的锚定力,开关阈值可以明显降低,同时也加快了液晶分子对电场的响应速度,实验发现采用532纳米光作为栗浦光,其开关阈值可以降低1-2个量级,响应速度可以提高2倍以上;③ 在金属纳米颗粒表面进行表面活性剂修饰,保证了金属纳米颗粒在与液晶分子混合的时候分散分布,减小液晶分子之间的阻力,使液晶分子的方向易于改变;④目前是通过电学传导控制光学开关,本发明是通过光能控制光学开 [0015] Compared with the prior art, advantages of the present invention is as follows: ① simple overall structure of the present invention, the device is simple, compact, easy to manufacture, heat sealing act as a seal of the liquid crystal molecules, ΙΤ0 film is used for the liquid crystal molecules orientation directional effect; ② respectively metal nanoparticles deposited on ΙΤ0 film, part of the metal nano-particles dissolved in the liquid crystal molecules, can use the surface of the metal nanoparticles, etc. upon irradiation Li pump light plasmon resonance effect, reduce the liquid crystal molecules in ΙΤ0 anchoring force of the film surface, the switching threshold may be significantly reduced, but also accelerated the liquid crystal molecules response speed to the electric field, was found using 532 nm light as Li pump light, the switching threshold can be reduced 1-2 orders of magnitude, the response speed can be improved more than 2 times; ③ a surfactant for modifying the surface of metal nano-particles, to ensure distribution of the metal nanoparticle dispersion is mixed with the liquid crystal molecules in time, to reduce the resistance between the liquid crystal molecules, so that the liquid crystal molecules easily change; ④ current electrically conductive by controlling the optical switch of the present invention is opened by controlling the optical energy 关,实现光控制光,本发明可以采用不同的金属材料和纳米结构,还适用于当前大部分液晶材料,其在全光开关领域的潜在应用巨大。 Off, to achieve light control light, the present invention may employ different metallic materials and nanostructures, this also applies to the majority of liquid crystal material, its enormous application potential in the field of all-optical switching.

附图说明 BRIEF DESCRIPTION

[0016] 图1为本发明的结构示意图。 [0016] FIG. 1 is a schematic structural diagram of the present invention.

[0017] 图2为图1中Α区域的放大图。 [0017] Figure 2 is an enlarged view of a region Α.

具体实施方式 Detailed ways

[0018] 下面我们结合附图和具体的实施例来对本发明的技术方案做进一步的详细阐述, 以求更为清楚明了地理解金属纳米颗粒掺杂的液晶光开关及其制备方法和使用方法,但不能以此剌艮制本发明的保护范围。 [0018] In the following accompanying drawings and specific embodiments described in detail further aspect of the present invention, in order to enhance the clarity and understanding of the metal nanoparticles doped liquid crystal light switches and their preparation and use, in this punching but not Gen scope of the invention is prepared.

[0019] 实施例1 本实施例金属纳米颗粒掺杂的液晶光开关,该液晶光开关包括石英基板1,所述石英基板厚度为毫米量级,两块石英基板形成一端开口的腔室2,所述腔室的宽度即腔室中液晶填充的厚度为5微米,石英基板的四周用热封层3完全热封封闭,所述腔室的内壁上均镀有ΙΤ0 薄膜层4,所述ΙΤ0薄膜层上均涂覆有金属纳米颗粒层,所述腔室2中灌有液晶分子5和经过表面活性剂修饰的金属纳米颗粒6,灌入液晶分子和经过表面活性剂修饰的金属纳米颗粒后,腔室的开口端7热封封闭。 [0019] Example 1 Example metal nanoparticles doped crystal embodiment of the optical switch, the optical switch comprises a crystal quartz substrate 1, a quartz substrate having a thickness of millimeter, two quartz plates forming chamber 2 opening at one end, i.e., the width of the chamber of the chamber filled with liquid crystal having a thickness of 5 micrometers, surrounded by a quartz plate heat seal heat seal layer 3 is completely enclosed, on an inner wall of the chamber are coated with a thin layer ΙΤ0 4, the ΙΤ0 after the nanoparticles are coated with a metal layer on the thin film layer, filling the chamber 2 through the liquid crystal molecules 5 and surfactant-modified metal nanoparticles 6, the liquid crystal molecules and poured into the surfactant-modified metal nanoparticles , the open end of the chamber 7 closed heat seal.

[0020] 本实施例中金属纳米颗粒层为金纳米颗粒层,金纳米颗粒层的厚度为10nm;经过表面活性剂修饰的金属纳米颗粒为金纳米颗粒,金纳米颗粒的粒径为30 nm, 作为优选,本实施例金纳米颗粒层中金纳米颗粒在腔室内壁单层分布,单层分布的覆盖率为75%。 [0020] In the present embodiment, the metal layer is a gold nanoparticle particle layer, the thickness of the layer was 10 nm gold nanoparticles; surfactant-modified metal nanoparticles are gold nanoparticles, gold nanoparticles diameter of 30 nm, preferably, the layer of gold nanoparticles embodiment according to the present embodiment gold particles distributed in the chamber monolayer, monolayer coverage of the distribution was 75%.

[0021] 本实施例金属纳米颗粒掺杂的液晶光开关的制备方法,包括以下步骤: 第一步,将石英基板的四周通过热封封闭组成一个一端开口的腔室,在所述腔室的内壁表面均镀有透明的IT0导电膜; 第二步,将一部分金纳米颗粒通过物理吸附作用分散沉积在IT0导电膜表面,金纳米颗粒在IT0导电膜表面单层分布形成紧密排列的单层分布,单层金纳米颗粒密集分布但不相互叠加,金纳米颗粒在IT0导电膜表面的覆盖率为75%; 第三步,将另一部分金纳米颗粒表面经过表面活性剂修饰形成全包裹的修饰层,然后将修饰后的金纳米颗粒加入液晶分子中并灌入腔室中,在腔室中形成以金纳米颗粒为核心液晶分子包裹的球体,所述表面活性剂通过官能团分子一端与金纳米颗粒进行螯合,官能团分子另一端与液晶分子进行螯合,从而在金纳米颗粒表面形成单层的表面活性 [0021] The present method of preparing a liquid crystal optical switch according to embodiment doped metal nanoparticles, comprising the steps of: a first step, the four weeks of the quartz substrate through the chamber is closed to form a heat-sealing an open end in the chamber the inner wall surfaces are coated with a transparent conductive film IT0; a second step, a portion of the gold particle dispersion is deposited by physical adsorption on the surface of the conductive film IT0, IT0 gold particles distributed in a single layer conductive film surface of the monolayer of closely spaced distribution , single gold nanoparticles are densely distributed, but are not superposed on each other, the gold nanoparticles in the conductive film surface coverage of 75% IT0; a third step, another portion of the surface of gold nanoparticles modified surfactant-modified layer forming a full wrap , gold particles were then added to the liquid crystal molecules modified and poured into the cavity formed in the core of the liquid crystal molecules gold particles encapsulated spheres in the chamber, the surfactant molecule by a functional group at one end to the gold particles chelation, the other end of the liquid crystal molecules and the functional groups chelating molecules, to form a monolayer of surfactant on the surface of gold particles 层之后,在表面活性剂层外覆盖一层液晶分子,受液晶分子保护后,金纳米颗粒之间分散状分布;本实施例第三步中官能团的选择依据是金纳米颗粒表面用来修饰的表面活性剂的电性,因为金纳米颗粒表面是柠檬酸三钠覆盖,因此整个颗粒是带有负电荷的,所以需选取带有正电荷的官能团进行螯合,比如带有3和~原子的正电荷的基团,本实施例中具体采用的表面活性剂为4-Sulfanylphenyl_4-[4-(octyloxy)phenyl]benzoate (SOPB) Thiol; 第四步,通过热封封闭腔室的开口端。 After the layer, the outer layer is covered with the surfactant molecules of the liquid crystal, the liquid crystal molecules are protected by gold particles dispersed between the distribution state; selected depending on the functional groups of the third step of the present embodiment is used to modify the surface of the gold nanoparticles electrically surfactant, since the surface of gold nanoparticles is covered trisodium citrate, and therefore the entire particle is negatively charged, so the need to select a functional group having a positive charge chelated, such as with 3 ~ atoms and positively charged group, the present embodiment in the specific surfactant used is 4-Sulfanylphenyl_4- [4- (octyloxy) phenyl] benzoate (SOPB) Thiol; a fourth step, by heat-sealing the open end of the closed chamber.

[0022] 本实施例中所述的石英基板是市场上常见的商用产品,所述的热封层是热固化胶,所述的ΙΤ0薄膜是铟锡金属氧化物薄膜,所述的金纳米颗粒直径为30纳米,通过柠檬酸三钠还原氯金酸溶液获得,再通过物理吸附作用沉积ΙΤ0薄膜表面;所述的液晶为向列相5CB液晶,液晶中掺杂的金纳米颗粒是通过对金纳米颗粒进行表面修饰后溶解到5CB液晶之中。 A quartz substrate [0022] In the embodiment of the present embodiment is common in commercial products on the market, the heat seal layer is a heat curable adhesive, the thin film is indium tin ΙΤ0 metal oxide thin film, the gold nanoparticles 30 nanometers in diameter, obtained by reducing chloroauric acid trisodium citrate solution, ΙΤ0 redeposited film surface by physisorption; said liquid crystal is a nematic liquid crystal 5CB liquid crystal doped with gold nanoparticles by gold after the nanoparticles are surface-modified crystal was dissolved into the 5CB. 液晶分子通过锚定作用和ΙΤ0薄膜相接触,并且通过该锚定作用使得液晶分子整体垂直于ΙΤ0薄膜表面排列,原理上要使液晶分子发生整体转动,首先需要克服ΙΤ0薄膜对和其接触的液晶分子的锚定力,而栗浦光照射就是在液晶分子上额外提供一个力矩,用于克服锚定力的影响。 The liquid crystal molecules by an anchoring effect and ΙΤ0 film contact, and by the anchoring effect of the liquid crystal molecules are arranged perpendicular to the ΙΤ0 overall surface of the film, to make the overall rotation of the liquid crystal molecules in principle, be overcome ΙΤ0 first liquid crystal film to the contact and the anchoring force molecule, Li Pu and the irradiation light is additionally provided a torque on the liquid crystal molecules, to overcome the effects of anchoring force.

[0023] 本实施例金属纳米颗粒掺杂的液晶光开关的使用方法,其特征在于包括以下步骤, 第一步,采用探测光8作为信号光,探测光的波长为1064纳米的连续光,采用栗浦光9作为控制光,栗浦光是波长为532纳米的连续光,所述探测光和栗浦光同时照射在石英基板的外表面,栗浦光的光斑覆盖探测光的光斑;在信号光的入射端设置起偏器10,在信号光的出射端设置检偏器11,所述起偏器和检偏器的偏振方向相互垂直;当没有栗浦光照射时,信号光通过起偏器变成偏振光,经过液晶开关之后到达检偏器,由于起偏器和检偏器的偏振方向垂直,信号光无法通过检偏器,此时开关为关闭状态; 第二步,当栗浦光施加在液晶分子上的转动力矩克服石英基板对液晶分子的锚定力, 液晶分子的排列方向发生改变,从而使信号光的偏振状态由线偏振变成椭圆偏振,此时信 [0023] Examples of the metal nanoparticle doping method using the liquid crystal optical switch of the present embodiment, comprising the following steps, the first step using the detection light 8 as signal light, the wavelength of the probe light is continuous light of 1064 nm, using Li pump light 9 as the control light, Li pump light having a wavelength of the continuous light 532 nm, the detection spot light Li pump light while irradiating the outer surface of the quartz plate, Li pump light spot covering the probe light; at the entrance end of the signal light is provided polariser 10, in the signal light exit end disposed analyzer 11, the polarizer and analyzer polarization directions perpendicular to each other; when no Li pump light irradiation, the signal light becomes polarized by the polarizer, through the liquid crystal shutter after reaching the analyzer, since the direction of polarization from the vertical polarizer and an analyzer, the signal light can not pass through the analyzer, then the switch is turned off; the second step, when the rotational torque applied to Li pump light to the liquid crystal molecules to overcome quartz a substrate anchoring force to the liquid crystal molecules, the alignment direction of liquid crystal molecules is changed, so that the polarization state of signal light from a linear polarization into elliptical polarization, then the letter 光到达检偏器之后,将有部分强度可以通过,此时开关为开启状态,实现液晶光开关的功能,透过光强的大小取决于栗浦光的强弱,其中栗浦光首先照射到沉积在ΙΤ0薄膜上的金纳米颗粒,引起这部分金纳米颗粒的表面等离激元共振效应,该效应能够大大增强金纳米颗粒表面附近的局域光场,因而栗浦光施加在金纳米颗粒附近的那些液晶分子上的转动力矩大大增加,只需要较弱的栗浦光就能够使和ΙΤ0薄膜接触的液晶分子发生偏转;随后这部分液晶分子带动液晶整体发生转动时,由于液晶整体掺杂了金纳米颗粒,很多液晶分子都能够感受到栗浦光施加的转动力矩的增强,因而对整体液晶分子而言,转动也将变得更加容易,所需要的栗浦光强自然也相应降低,同时,由于金纳米颗粒的存在,无论是ΙΤ0表面的液晶分子还是整体液晶分子都更容易转动, After the light reaching the analyzer, there will be some level can be, at this time the switch is turned on, to realize the function of the liquid crystal optical switches, through strong light depends on the strength of Li pump light, wherein the Li pump light is first irradiated onto the deposited ΙΤ0 film gold nanoparticles, gold nanoparticles causes this part of the surface of the plasmon resonance effect, which can greatly enhance the local field near a light gold particle surfaces, and thus pump light Li is applied to the liquid crystal molecules in the vicinity of those gold nanoparticles turning torque greatly increased, a weak Li need only pump light and can make contact with the liquid crystal molecules are deflected ΙΤ0 film; then this part of the liquid crystal molecules of the liquid crystal drive rotates integrally occur, due to the overall liquid crystal doped with gold particles, many of the liquid crystal molecules can feel enhanced turning torque Li pump light is applied, so that the whole of the liquid crystal molecules, the rotation will also become easier, Li pump intensity required naturally also reduced, while the presence of gold nanoparticles, either ΙΤ0 or the overall surface of the liquid crystal molecules of the liquid crystal molecules are more easily rotated, 而对栗浦光的响应速度就更快,从而也提高了该液晶光开关的响应速度。 While the response speed of the pump light Li is faster, thus improving the response speed of the liquid crystal optical switch.

[0024] 本实施例中可以采用不同大小的金纳米颗粒,分布均为单层密集分布,金纳米颗粒对栗浦光的放大倍数,见表1: 弄1 [0024] The present embodiment may employ gold particles of different sizes, are distributed dense monolayers, gold nanoparticles magnification Li pump light, shown in Table 1: Lane 1

Figure CN105652487AD00071

本实施例金属纳米颗粒掺杂的液晶光开关,该液晶光开关包括石英基板1,所述石英基板厚度为毫米量级,两块石英基板形成一端开口的腔室2,所述腔室的宽度即腔室中液晶填充的厚度为200微米,石英基板的四周用热封层3完全热封封闭,所述腔室的内壁上均镀有ΙΤ0薄膜层4,所述ΙΤ0薄膜层上均涂覆有银纳米颗粒层,所述腔室2中灌有液晶分子5和经过表面活性剂修饰的银纳米颗粒,灌入液晶分子和经过表面活性剂修饰的银纳米颗粒后,腔室的开口端7热封封闭。 Examples of the metal nanoparticles doped liquid crystal optical switch of the present embodiment, the liquid crystal optical switch 1 comprises a quartz substrate, a quartz substrate having a thickness of millimeter, two quartz plates forming a chamber open end 2, the width of the chamber i.e., the liquid crystal filled chamber having a thickness of 200 micrometers, surrounded by a quartz plate heat seal heat seal layer 3 is completely enclosed, on an inner wall of the chamber are coated with a thin layer ΙΤ0 4, each film layer coated on the ΙΤ0 silver nanoparticle layer, filling the chamber 2 through the liquid crystal molecules 5 and surfactant-modified silver nanoparticles, the liquid crystal molecules and poured into the surfactant-modified silver nanoparticles, the end opening of the chamber 7 heat-sealing closure.

[0025] 本实施例中金属纳米颗粒层为银纳米颗粒层,银纳米颗粒层的厚度为50nm;经过表面活性剂修饰的金属纳米颗粒为银纳米颗粒,银纳米颗粒的粒径为50 nm。 [0025] In the present embodiment, the metal nanoparticle layer is a layer of silver nanoparticles, silver nanoparticles layer thickness of 50 nm; surfactant-modified metal nanoparticles are silver nanoparticles, silver nanoparticles of a particle size of 50 nm.

[0026] 作为优选,本实施例银纳米颗粒层中银纳米颗粒在腔室内壁单层分布,单层分布的覆盖率为78%。 [0026] Preferably, the silver nanoparticles are silver nanoparticles layer embodiment of the present embodiment in the chamber distributed monolayer, monolayer coverage of the distribution of 78%.

[0027] 本实施例金属纳米颗粒掺杂的液晶光开关的制备方法,包括以下步骤: 第一步,将石英基板的四周通过热封封闭组成一个一端开口的腔室,在所述腔室的内壁表面均镀有透明的ΙΤ0导电膜; 第二步,将一部分银纳米颗粒通过物理吸附作用分散沉积在ΙΤ0导电膜表面,银纳米颗粒在ΙΤ0导电膜表面单层分布形成紧密排列的单层分布,单层银纳米颗粒密集分布但不相互叠加,银纳米颗粒在ΙΤ0导电膜表面的覆盖率为78%; 第三步,将另一部分银纳米颗粒表面经过表面活性剂修饰形成全包裹的修饰层,然后将修饰后的银纳米颗粒加入液晶分子中并灌入腔室中,在腔室中形成以银纳米颗粒为核心液晶分子包裹的球体,所述表面活性剂通过官能团分子一端与银纳米颗粒进行螯合,官能团分子另一端与液晶分子进行螯合,从而在银纳米颗粒表面形成单层的表面 [0027] The present method of preparing a liquid crystal optical switch according to embodiment doped metal nanoparticles, comprising the steps of: a first step, the four weeks of the quartz substrate through the chamber is closed to form a heat-sealing an open end in the chamber the inner wall surfaces are coated with a transparent conductive film ΙΤ0; a second step, a portion of the silver nanoparticles dispersed is deposited by physical adsorption on the surface of the conductive film ΙΤ0, silver nanoparticles in the conductive film surface ΙΤ0 single profile forming a monolayer of closely spaced distribution monolayer silver nanoparticles are densely distributed, but are not superposed on each other, the coverage of silver nanoparticles in the conductive film surface ΙΤ0 78%; the third step, another portion of the surface of the silver nanoparticles through the surfactant-modified layer forming a full wrapping modified , then the modified silver nanoparticles after added to the liquid crystal molecules and poured into the cavity, the silver nanoparticles are formed in the core of the liquid crystal molecules in the chamber sphere wrapped in the surfactant molecule by a functional group at one end with silver nanoparticles chelation, the other end of the liquid crystal molecules and the functional groups chelating molecules, thereby forming the surface of the monolayer on the surface of the silver nano particles 活性剂层之后,在表面活性剂层外覆盖一层液晶分子,受液晶分子保护后,银纳米颗粒之间分散状分布;本实施例第三步中官能团的选择依据是银纳米颗粒表面用来修饰的表面活性剂的电性,因为银纳米颗粒表面是柠檬酸三钠覆盖,因此整个颗粒是带有负电荷的,所以需选取带有正电荷的官能团进行螯合,比如带有3和~原子的正电荷的基团;本实施例中具体采用的表面活性剂为4-Sulfanylphenyl_4-[4-(octyloxy)phenyl]benzoate (SOPB) Thiol; 第四步,通过热封封闭腔室的开口端。 After the active agent layer, the outer layer is covered with the surfactant molecules of the liquid crystal, the liquid crystal molecules are protected by dispersing the silver nanoparticles form distribution; selected depending on the functional groups in a third embodiment according to the present embodiment is a step surface of the silver nano-particles used modified electrical surfactant, because the silver nanoparticle surface is covered trisodium citrate, and therefore the entire particle is negatively charged, so the need to select a functional group having a positive charge chelated, such as with 3 and ~ positively charged atom groups; embodiment according to the present embodiment in particular the surfactant used is 4-Sulfanylphenyl_4- [4- (octyloxy) phenyl] benzoate (SOPB) Thiol; a fourth step, by heat-sealing the open end of the closed chamber .

[0028] 本实施例中所述的石英基板是市场上常见的商用产品,所述的热封层是热固化胶,所述的ΙΤ0薄膜是铟锡金属氧化物薄膜,所述的金纳米颗粒直径为20纳米,通过柠檬酸三钠还原硝酸银溶液获得,再通过物理吸附作用沉积ΙΤ0薄膜表面;所述的液晶为向列相5CB液晶,液晶中掺杂的银纳米颗粒是通过对银纳米颗粒进行表面修饰后溶解到5CB液晶之中,液晶分子通过锚定作用和ΙΤ0薄膜相接触,并且通过该锚定作用使得液晶分子整体垂直于ΙΤ0薄膜表面排列,原理上要使液晶分子发生整体转动,首先需要克服ΙΤ0薄膜对和其接触的液晶分子的锚定力,而栗浦光照射就是在液晶分子上额外提供一个力矩,用于克服锚定力的影响。 A quartz substrate [0028] In the embodiment of the present embodiment is common in commercial products on the market, the heat seal layer is a heat curable adhesive, the thin film is indium tin ΙΤ0 metal oxide thin film, the gold nanoparticles 20 nanometers in diameter, obtained by reduction of silver nitrate solution trisodium citrate, ΙΤ0 redeposited film surface by physisorption; said liquid crystal is a nematic liquid crystal 5CB, liquid crystal is doped with silver nanoparticles by silver nano after dissolution of the surface-modified particles into the 5CB liquid crystal molecules by an anchoring effect and ΙΤ0 film contact, and by the anchoring effect of the liquid crystal molecules are arranged perpendicular to the ΙΤ0 overall surface of the film, to make the overall rotation of the liquid crystal molecules in principle firstly to overcome ΙΤ0 film and anchoring force on liquid crystal molecules in contact therewith, the light irradiation is to provide a Li Pu additional torque on the liquid crystal molecules, the anchoring force to overcome the effects.

[0029] 本实施例金属纳米颗粒掺杂的液晶光开关的使用方法,其特征在于包括以下步骤, 第一步,采用探测光8作为信号光,探测光波长为1064纳米的连续光,采用栗浦光9作为控制光,栗浦光是波长为400纳米的连续光,所述探测光和栗浦光同时照射在石英基板的外表面,栗浦光的光斑覆盖探测光的光斑;在信号光的入射端设置起偏器10,在信号光的出射端设置检偏器11,所述起偏器和检偏器的偏振方向相互垂直;当没有栗浦光照射时,信号光通过起偏器变成偏振光,经过液晶开关之后到达检偏器,由于起偏器和检偏器的偏振方向垂直,信号光无法通过检偏器,此时开关为关闭状态; 第二步,当栗浦光施加在液晶分子上的转动力矩克服石英基板对液晶分子的锚定力, 液晶分子的排列方向发生改变,从而使信号光的偏振状态由线偏振变成椭圆偏振,此时信号 [0029] Examples of the metal nanoparticle doping method using the liquid crystal optical switch of the present embodiment, comprising the following steps, the first step using the detection light 8 as signal light, the probe light having a wavelength of 1064 nm continuous light, using a light pump Li 9 as the control light, Li pump light having a wavelength of the continuous light 400 nm, the probe light Li pump light while irradiating the outer surface of the quartz plate, Li pump light spot covering the spot of the probe light; at the entrance end of the signal light is provided polarizer 10, the signal light exit end disposed analyzer 11, the polarization direction of the polarizer and analyzer are perpendicular to each; when no Li pump light irradiation, the signal light passes through the polarizer become polarized, after liquid crystal shutter reaches the analyzer, since the direction of polarization from the vertical polarizer and an analyzer, the signal light can not pass through the analyzer, then the switch is turned off; the second step, when the rotational torque applied to Li pump light to the liquid crystal molecules against a quartz substrate anchoring force on liquid crystal molecules, the alignment direction of liquid crystal molecules is changed, so that the polarization state of signal light becomes elliptically polarized by the linear polarizer, this time the signal 光到达检偏器之后,将有部分强度可以通过,此时开关为开启状态,实现液晶光开关的功能,透过光强的大小取决于栗浦光的强弱,其中栗浦光首先照射到沉积在ΙΤ0薄膜上的银纳米颗粒,引起这部分银纳米颗粒的表面等离激元共振效应,该效应能够大大增强银纳米颗粒表面附近的局域光场,因而栗浦光施加在银纳米颗粒附近的那些液晶分子上的转动力矩大大增加,只需要较弱的栗浦光就能够使和ΙΤ0薄膜接触的液晶分子发生偏转;随后这部分液晶分子带动液晶整体发生转动时,由于液晶整体掺杂了银纳米颗粒,很多液晶分子都能够感受到栗浦光施加的转动力矩的增强,因而对整体液晶分子而言,转动也将变得更加容易,所需要的栗浦光强自然也相应降低,同时,由于银纳米颗粒的存在,无论是ITO表面的液晶分子还是整体液晶分子都更容易转动,因 After the light reaching the analyzer, there will be some level can be, at this time the switch is turned on, to realize the function of the liquid crystal optical switches, through strong light depends on the strength of Li pump light, wherein the Li pump light is first irradiated onto the deposited ΙΤ0 film silver nanoparticles on, causing the surface of this part of the silver nanoparticles plasmon resonance effect, which can greatly enhance the local light field around the silver nanoparticle surface, thereby Li pump light applied to those liquid crystal molecules in the vicinity of the silver nanoparticles turning torque greatly increased need weaker Li pump light is only able to make the liquid crystal molecules ΙΤ0 film contact deflected; then this part of the liquid crystal molecules are driven by rotation of the liquid crystal overall incidence, since the entire liquid crystal doped with silver nanoparticles, a lot of the liquid crystal molecules can feel enhanced turning torque Li pump light is applied, so that the whole of the liquid crystal molecules, the rotation will also become easier, Li pump intensity required naturally also reduced, while the presence of silver nanoparticles, either ITO or the overall surface of the liquid crystal molecules of the liquid crystal molecules are more easily rotated, because 对栗浦光的响应速度就更快,从而也提高了该液晶光开关的响应速度。 Li response speed is faster pump light, thus improving the response speed of the liquid crystal optical switch.

[0030] 本实施例中可以采用不同大小的银纳米颗粒,分布均为单层密集分布,银纳米颗粒对栗浦光的放大倍数,见表2。 [0030] This may take different size silver nanoparticles embodiment, a single layer distribution are densely distributed, the magnification of the silver nanoparticles pump light chestnut, see Table 2.

[0031] 表2 [0031] TABLE 2

Figure CN105652487AD00091

Claims (10)

1. 一种金属纳米颗粒掺杂的液晶光开关,其特征在于,该液晶光开关包括石英基板(1),两块石英基板形成一端开口的腔室(2),石英基板的四周用热封层(3)完全热封封闭, 所述腔室的内壁上均镀有ITO薄膜层(4),所述ITO薄膜层上均涂覆有金属纳米颗粒层,所述腔室(2)中灌有液晶分子(5)和经过表面活性剂修饰的金属纳米颗粒(6),灌入液晶分子和经过表面活性剂修饰的金属纳米颗粒后,腔室的开口端(7)热封封闭。 A metal nanoparticle-doped liquid crystal optical switch, wherein the optical switch comprises a quartz crystal plate (1), two quartz plates forming chamber (2) open at one end, surrounded by a heat-sealed quartz substrate layer (3) is completely heat sealed closure, on the inner wall of the chamber are coated with an ITO thin film layer (4), is coated with the metal nanoparticle layer on the ITO film layer, the chamber (2) of the filling liquid crystal molecules (5) and the surfactant-modified metal nanoparticles (6), the liquid crystal molecules after instillation and surfactant-modified metal nanoparticles, the open end of the chamber (7) heat-sealed closed.
2. 根据权利要求1所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述金属纳米颗粒层的厚度为10-80nm〇 The metal nanoparticles according to a liquid crystal doped optical switch as claimed in claim, characterized in that the thickness of the metal nanoparticle layer is 10-80nm〇
3. 根据权利要求1所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述金属纳米颗粒层中金属纳米颗粒在腔室内壁单层分布。 The liquid crystal metal nanoparticle according to claim 1 doped optical switch, wherein the metal nanoparticles in the metal nanoparticle layer distribution in the chamber monolayer.
4. 根据权利要求3所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述金属纳米颗粒在腔室内壁单层分布的覆盖率为75-78%。 The liquid crystal metal nanoparticles according to claim 3 doped optical switch, wherein the metal nanoparticles in the coverage of the chamber monolayer distribution of 75-78%.
5. 根据权利要求1所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述金属纳米颗粒层为金纳米颗粒层,经过表面活性剂修饰的金属纳米颗粒为金纳米颗粒。 The liquid crystal metal nanoparticle according to claim 1 doped optical switch, wherein said metallic nanoparticle layer is a layer of gold nanoparticles, surfactant-modified metal nanoparticles are gold nanoparticles.
6. 根据权利要求1所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述金属纳米颗粒层为银纳米颗粒层,经过表面活性剂修饰的金属纳米颗粒为银纳米颗粒。 The liquid crystal metal nanoparticle according to claim 1 doped optical switch, wherein said metallic nanoparticle layer is a layer of silver nanoparticles, surfactant-modified metal nanoparticles are silver nanoparticles.
7. 根据权利要求1所述的金属纳米颗粒掺杂的液晶光开关,其特征在于,所述腔室的宽度为5微米到300微米,所述石英基板厚度为毫米量级。 The metal nanoparticles according to a liquid crystal doped optical switch as claimed in claim, characterized in that the width of the chamber is 5 to 300 microns, a quartz substrate having a thickness of millimeters.
8. -种权利要求7所述的金属纳米颗粒掺杂的液晶光开关的制备方法,其特征在于包括以下步骤: 第一步,将石英基板的四周通过热封封闭组成一个一端开口的腔室,在所述腔室的内壁表面均镀有透明的ITO导电膜; 第二步,将一部分金属纳米颗粒通过物理吸附作用分散沉积在ITO导电膜表面,金属纳米颗粒在ITO导电膜表面单层分布形成紧密排列的单层分布,单层金属纳米颗粒密集分布但不相互叠加,金属纳米颗粒在ITO导电膜表面的覆盖率不低于30%; 第三步,将另一部分金属纳米颗粒表面经过表面活性剂修饰形成全包裹的修饰层,然后将修饰后的金属纳米颗粒加入液晶分子中并灌入腔室中,在腔室中形成以金属纳米颗粒为核心液晶分子包裹的球体,受液晶分子保护后,金属纳米颗粒之间分散状分布; 第四步,通过热封封闭腔室的开口端。 8. - Preparation of the metal nanoparticles in the liquid crystal 7 doped optical switch as claimed in claim species, characterized by comprising: a first step, the four weeks quartz substrate by heat sealing to form a closed chamber with one open end the inner wall surface of the chamber are coated with a transparent ITO conductive film; a second step, a portion of the metal nanoparticle dispersion is deposited by physical adsorption on the surface of the ITO conductive film, metal nanoparticles distributed in the ITO conductive film surface of the monolayer forming a monolayer of closely spaced distribution, single-layer metal nanoparticles are densely distributed, but are not superposed on each other, the metal nanoparticle coverage conductive surface of the ITO film is not less than 30%; the third step, another portion of the metal surface of the nanoparticles through surface modifying agent to form a full wrapping of the modified layer, and the metal nanoparticles after added to the liquid crystal molecules modified and poured into the cavity, the metal nanoparticles are formed in the core of the liquid crystal molecules sphere wrapped in the chamber, the liquid crystal molecules are protected by after, the dispersion state between the distribution of metal nanoparticles; a fourth step, by heat-sealing the open end of the closed chamber.
9. 根据权利要求8所述的金属纳米颗粒掺杂的液晶光开关的制备方法,其特征在于,所述表面活性剂通过官能团分子一端与金属纳米颗粒进行螯合,官能团分子另一端与液晶分子进行螯合,从而在金属纳米颗粒表面形成单层的表面活性剂层之后,在表面活性剂层外覆盖一层液晶分子。 9. A method for preparing metal nanoparticles according to the liquid crystal 8 doped optical switch according to claim, characterized in that the surface active agent chelating molecule via a functional group with one end of the metal nanoparticles, the other end of the molecule of the liquid crystal molecules a functional group after chelation, thereby forming a surfactant layer in a monolayer surface of the metal nano-particles, the outer layer is covered with the surfactant molecules of the liquid crystal.
10. -种权利要求7所述的金属纳米颗粒掺杂的液晶光开关的使用方法,其特征在于包括以下步骤, 第一步,采用探测光(8)作为信号光,采用栗浦光(9)作为控制光,所述探测光和栗浦光同时照射在石英基板的外表面,栗浦光的光斑覆盖探测光的光斑;在信号光的入射端设置起偏器(10),在信号光的出射端设置检偏器(11),所述起偏器(10)和检偏器(11)的偏振方向相互垂直;当没有栗浦光照射时,信号光通过起偏器变成偏振光,经过液晶开关之后到达检偏器,由于起偏器和检偏器的偏振方向垂直,信号光无法通过检偏器,此时开关为关闭状态; 第二步,当栗浦光施加在液晶分子上的转动力矩克服石英基板对液晶分子的锚定力, 液晶分子的排列方向发生改变,从而使信号光的偏振状态由线偏振变成椭圆偏振,此时信号光到达检偏器之后,将有部分强度可以 10. - 7 The metal nanoparticles doping method using the liquid crystal optical switch as claimed in claim species, comprising the following steps, the first step, using probe light (8) as signal light, pump light using Li (9) as a control light, the probe light spots light Li pump light while irradiating the outer surface of the quartz plate, Li pump light spot covering the probe light; at the entrance end of the signal light is provided polarizer (10), at the signal light exit end disposed subject polarizer (11), said polarizer (10) and an analyzer (11) in the direction of polarization perpendicular to each other; and when there is no irradiation of light chestnut pump, signal light into polarized light through the polarizer, the liquid crystal switch after reaching the subject polarizer, since the direction of polarization from the vertical polarizer and an analyzer, the signal light can not pass through the analyzer, then the switch is turned off; the second step, when the rotational torque is applied to the light Li pump the liquid crystal molecules of the liquid crystal against a quartz substrate after anchoring force molecular arrangement direction of liquid crystal molecules is changed, so that the polarization state of signal light becomes elliptically polarized by the linear polarizer, this time the signal light reaches the analyzer, the intensity may have a portion 通过,此时开关为开启状态,实现液晶光开关的功能。 By this time the switch is turned on, to realize the function of the liquid crystal optical switch.
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