共查询到20条相似文献,搜索用时 78 毫秒
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胆甾相液晶具有自发的螺旋排列,是一个有趣又引人入胜的手性超分子各向异性体系。近几年胆甾相液晶体系,特别是光调谐的胆甾相液晶在新领域的应用出现令人欣喜的研究结果。本文综述了近几年光调谐的胆甾相液晶在滤波、液晶光栅以及液晶激光中的研究成果。具有光调谐特性胆甾相液晶在特殊需求的光学器件中的应用将是胆甾相液晶研究的一个很有潜力的研究方向。 相似文献
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不同单体配比对聚合物网络及聚合物稳定胆甾相液晶器件光电性能的影响 总被引:1,自引:1,他引:0
为了调节聚合物网络与液晶分子之间的相互作用,从而改善聚合物稳定胆甾相液晶(PSCLC)的光电性能,本文采用紫外光聚合诱导相分离法(PIPS)制备了聚合物稳定胆甾相液晶,通过控制2种单体RM257与BAB6的比例来改善器件性能。随着RM257含量的减少,聚合物网络由取向排列的纤维状结构向疏松不规整的交联状结构转变,形成的聚合物网络对液晶分子的锚定作用减弱,聚合物稳定胆甾相液晶的饱和电压降低,关闭时间增大。当RM257与BAB6质量比为1∶4时,聚合物稳定胆甾相液晶器件具有较好的对比度。 相似文献
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聚合物稳定的双稳态胆甾液晶显示器的电光特性 总被引:3,自引:1,他引:2
将一种具很高黏度系数的聚合物单体以不同的百分比浓度掺入到胆甾液晶中,形成不同聚合物网络稳定的双稳态胆甾液晶显示器件。本文主要针对它们的反射光谱特性及阈值电压特性进行测试分析,并联系其中聚合物网络的结构形态,分析得出了此种聚合物单体所形成的聚合物网络对双稳态胆甾液晶显示特性的影响关系。 相似文献
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研制了染料掺杂胆甾相液晶激光器,测试分析了器件激光输出特性。将激光染料DCM、手性剂S-811、液晶TEB30A按一定比例混合,注入摩擦取向的液晶盒中,形成平面态排列的胆甾相液晶激光器件。利用532 nm波段的Nd:YAG脉冲倍频激光泵浦液晶器件,获得了禁带边沿激光输出,测量分析了激光能量阈值特性与激光光斑能量分布特点。液晶激光器在光子禁带边沿607 nm和680 nm处获得激光输出,线宽小于0.5 nm。在液晶器件中,光子禁带边缘处光子态密度最大,此处器件阈值较低,容易产生激光辐射。 相似文献
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Based on the nonlinear medium transfer theory, optical bistability of nonlinear microcavity is investigated at oblique incidence. It is found that the critical frequency of incident light inducing bistability phenomenon is related to the polarization and incident angle. The critical frequency increases with the incident angle. Increasing the incident angle can make bistability happen easier for focusing Kerr medium, but will hinder bistability for defocusing Kerr medium. The bistability switch threshold of TE mode is significantly lower than that of TM mode at a large incident angle. 相似文献
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本文第一次报导了Ag-TCNQ薄膜的双稳态现象。双稳F-P腔是由Ag-AgTCNQ-Ag膜系组成。并观察了Ag-TCNQ薄膜典型的双稳回线。 相似文献
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Xuefei Tang van der Ziel J.P. Bing Chang Johnson R. Tatum J.A. 《Quantum Electronics, IEEE Journal of》1997,33(6):927-932
Two different types of bistability in proton-implanted GaAs quantum-well (QW) vertical-cavity surface-emitting lasers (VCSELs) have been observed. The first type of bistability has a small hysteresis width (~50 μA) in the light versus current and voltage versus current characteristics. Light-induced large negative differential resistance, random fluctuations, and self-pulsations are observed at the switching point. The emission patterns show that the bistability occurs at a spatially localized area under the output facet that covers only a small fraction of the N1S-μm-diameter aperture. The bistability stems from spatially localized saturable absorption. The second type of bistability has a large hysteresis width (~1 μA) in the L-1 characteristics and is observed well above the threshold current. In this case, no observable bistable loop exists in the voltage versus current characteristics, and the bistability is associated with transverse mode-hopping 相似文献
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We present a theoretical study of multiple bistability in an optical-fiber double-ring resonator. The multiple bistability is caused by the optical Kerr effect, which modulates the refractive index of the fiber. The dependence of the multiple bistability on various parameters of the fibers and the couplers is investigated 相似文献
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Rubbing Mura是以接触式摩擦工艺生产TFT_LCD产品时常见的顽固缺陷,尤其在HADS产品上不良发生率更高。本文对Rubbing Mura产生的原因及机理进行分析,发现该不良由TFT基板上的源极线(Source Data,SD)附近的Rubbing弱区漏光引起。研究了Rubbing强度(Nip值)、Rubbing布型号、Rubbing布寿命、黑矩阵(Black Matrix,BM)加宽和SD减薄对HADS产品的Rubbing Mura的影响,选择最优的工艺条件,Rubbing Mura的不良发生率由2.4%降至0%,改善效果明显。 相似文献
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用半经典理论分析了含有多普勒加宽的斯塔克效应光学双稳性,分析了多普勒加宽及其饱和效应对该斯塔克效应光学双稳性的影响. 相似文献
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Polarization bistability in vertical-cavity surface-emitting lasers (VCSELs) subject to optical feedback has been studied both experimentally and theoretically. Optical feedback is shown to reduce the width of the bistability hysteresis loop and, hence, suppress the bistability. It is also demonstrated experimentally that polarization-selective optical feedback can be utilized to eliminate VCSEL polarization switching without inducing instabilities in the device. 相似文献
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在CdS吸收型热光双稳态现象中的空间效应 总被引:1,自引:0,他引:1
在CdS单晶片(厚度为1~3μm)上,用Ar~+激光(λ=514.5nm)作光源,实现了室温热光光学双稳态(OB),记录了热光光学双稳态下的横向空间效应和开关波。研究了在热光光学双稳态和热击穿状态下晶体的不同性状,估算出相互独立工作的热光OB元件之间的最小距离为200μm。 相似文献