基于激发态吸收的曙红Y全光逻辑

用倍频YAG脉冲激光作为控制光以使三重激发态对作为信号光的氦氛激光实现非线性光学吸收,从而演示了曙红Y的全光逻辑,并在理论上进行了分析和讨论。     

MCNTs及KOH活化MCNTs对曙红Y的吸附性能

以有机染料曙红Y为去除目标,利用紫外光谱法以MCNTs及KOH活化MCNTs为吸附剂研究了其对曙红Y的吸附特性,利用扫描隧道电镜(SEM),X射线粉末衍射(XRD)和BET法对KOH活化MCNTs进行了表征;实验结果表明,在相同的条件下,KOH活化MCNTs较未经处理的MCNTs对曙红Y有更好的吸附性能,另外研究了pH值和温度对吸附量的影响,结果表明溶液pH值和温度对吸附量影响较大,并利用吸附动力学和等温吸附曲线探究了其吸附过程的动力学和热力学特点.     

基于激发态吸收的C60分子全光开关特性研究

用５３２．０ｎｍ的脉冲Ｎｄ：ＹＡＧ激光作为泵浦光，７４７．０ｎｍ的连续半导体激光作为探测光，在Ｃ₆₀甲苯溶液中，利用Ｃ₆₀分子的三重态－三重态非线性吸收效应，获得Ｃ₆₀分子的全光开关和全光调制特性，并用速率方程进行了动力学数值模拟，得到与实验相一致的结果。 关键词：     

曙红Y与牛血清白蛋白相互作用机理

用分光光度法研究了在酸性介质中曙红Y（EOSY）与牛血清白蛋白（BSA）作用的吸收光谱,考察了不同pH、BSA浓度、EOSY浓度、乙醇浓度、NaCl浓度以及十二烷基硫酸钠（SDS）浓度对EOSY-BSA复合物的影响。实验结果表明,EOSY与BSA相互作用形成了EOSY-BSA复合物,最大吸收波长从原来的519nm红移到530nm。这主要是由于EOSY与BSA分子在静电作用的基础上,由EOSY与BSA分子间的疏水作用引起的。这为探讨有机小分子与生物大分子蛋白质相互作用的机理提供了依据。     

高比表面积活性炭对曙红Y染料的吸附

以海南椰树壳为原料通过复合物理活化方法制备出2162.84m2/g的高比表面积活性炭,所得活性炭孔径分布范围为1.1-2.5nm.选择对曙红Y染料进行吸附研究,采用分光光度法考查吸附剂用量、pH值、初始浓度、温度与吸附时间对单组分体系染料的吸附量与脱除效果的影响.结果表明在曙红Y浓度1600g ·m-3、pH为2.02、吸附时间10min、温度318K和吸附剂用量0.05g时脱除率可达99.9％.     

基于激发态非线性拆射效应的全光开关与光限幅

提出一种新型的光控光开关，以５３２ｎｍ脉冲激光入射金属－类卟啉有机材料，强激发态吸收导致瞬态透镜效应，使同时通过介质的６３２．８ｎｍ激光实现光开关，实验演示了开关特性，开启和关闭时间均为１００ｎｓ，还演示了激发态吸收和非线性折射两种效应共同作用的单光束光限幅，对上述两种基于非线性折射效应的器件特性进行了理论分析。     

曙红Y与牛血清白蛋白结合反应特征研究

研究了曙红Y(EOSY)与牛血清白蛋白(BSA)作用的荧光光谱和紫外-可见吸收光谱特征,实验证明EOSY具有较强地猝灭BSA荧光强度的能力,分别用Stern-Volmer方程、Lineweaver-Burk方程和热力学方程等处理试验数据,得到了25 ℃时反应的结合常数为3.601×105 L·mol-1,反应的ΔHθ,ΔGθ和ΔSθ分别为-20.66,-31.70 kJ·mol-1和37.06 J·K-1, 为研究在人体生理条件下EOSY与BSA的结合方式、EOSY对BSA构象影响和细胞染色机理等提供了重要信息。     

激发态质子转移分子2-(2'-羟基苯基)苯并噻唑溶液的全光开关效应

研究了激发态质子转移(ESPT)分子2-(2'-羟基苯基)苯并噻唑(HBT)在不同极性溶剂中的光开关行为,探讨了溶剂极性对HBT分子光开光效应的影响.揭示了光开关脉冲信号的形成原因,建立了基于光诱导HBT分子激发态非线性折射效应的皮秒全光开关的理论模型.根据对时间响应函数的理论计算和实验结果分析,确定了光开关脉冲信号下降前沿和上升后沿的形成机理以及影响因素,并提出了增强光开关信号下降前沿的关断深度,提升上升后沿的恢复速度的有效途径和方法.本文工作为制成皮秒量级关断,微秒甚至纳秒量级重新打开的快速全光开关器 关键词： 全光开关 2-(2'-羟基苯基)苯并噻唑(HBT) 激发态质子转移 非线性光学特性     

碳量子点/曙红Y比率型荧光探针测定L-抗坏血酸

以天然生物质去皮的蓖麻为碳源,采用一步水热法合成了荧光性能优良的绿色荧光蓖麻碳量子点(CO-CQDs),对其形貌和发光性能进行了表征。通过将该CO-CQDs与荧光极强的卤代荧光素染料曙红Y(EY)复合,二者可形成荧光发射峰相距较远的新型CO-CQDs/EY复合物。在pH=4.00的Na₂HPO₄-柠檬酸缓冲溶液中,在320 nm的激发波长下,CO-CQDs/EY复合物于405 nm和540 nm处显示出两个独立的荧光发射峰。在该体系中加入Cr(Ⅵ),405 nm和540 nm两处的荧光信号均显著猝灭。L-抗坏血酸(L-ascorbic acid,AA)的加入可使复合物于540 nm的荧光信号恢复,而405 nm处的荧光强度基本不变。据此建立了一种以CO-CQDs/EY复合物为比率型荧光探针测定AA的新方法。实验测定了荧光信号恢复的最佳条件和影响荧光恢复的因素,初步探讨了反应机理。在优化的实验条件下,该探针于540 nm/405 nm两处的荧光强度比值与AA的浓度在5.0×10^-8～4.0×10^-6 ...     

交叉波导中的非线性全光开关

提出了交叉波导结构中的非线性全光开关设想。用光束传输法，就自聚焦以及自散焦两种不同衬材料导，显示了全光开关的原理以及结构参量与开关特性之间的关系。     

Polarization-Dependent Phase-Conjugate Reflectivity in Randomly Oriented Saturable Absorbers: Effects of Direction of Transition Dipole Moment Associated with Excited-State Absorption

The effects of the direction of transition dipole moment on polarization-dependent phase-conjugate (PC) reflectivity by degenerate four-wave mixing in a saturable-dye-doped film are theoretically investigated. On the basis of a four-energy-level model for the saturable dyes, the pump-intensity dependence of the PC reflectivity is calculated for the two cases of a probe wave being polarized either parallel or perpendicular to pump waves, when the transition dipole moment associated with excited-state absorption tilts from that associated with ground-state one. For the parallel polarization, in the case of two transition dipole moments having different directions, a dip appears in the PC reflectivity curve near a resonant frequency on account of the characteristics of nonlinear absorption, whereas it disappears when the frequency of light is off resonance due to the influence of nonlinear refractive index.     

Analyzing the Switching Characteristics of a NOLM Demultiplexer with on Analytic and Numrical Methods

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Analyzing the Switching Characteristics of a NOLM Demultiplexer with on Analytic and Numerical Methods

The switching characteristics of a NOLM demultiplexer are investigated by using an analytic and numerical methods. The results reveal that the switching characteristics of a NOLM demultiplexer depend on parameters such as the power coupling ratio of the coupler,the peak power of control pulses,the walk-off and the initial time delay between signal pulses and control pulses,etc. The efficiency of NOLM is dependent on the peak power of control pulses. However,the switching window profile begins to oscillate as the power exceeds a critical value and this will be detrimental to the demultiplexed signals. The signal-control pulse walk-off can broaden the switching window of NOLM,make the window profile deviate from its central position,and decrease its switching efficiency.     

Conformational changes of Na,K-ATPase probed with eosin Y

Time-resolved fluorescence and binding studies have been carried out on Na,K-ATPase in the presence of the fluorescent dye eosin Y to obtain thermodynamic and kinetic parameters for the interaction of the enzyme with different cations. Eosin Y binding is indicated by a 3 ns fluorescence decay process and is observed only in the presence of mono- and divalent cations. This type of cation binding is interpreted as a nonselective electrostatic interaction, with negatively charged groups of the enzyme providing a high-affinity eosin Y binding site. Eosin Y binding is observed only under conditions where the enzyme exists in the conformational state F₁. The kinetic parameters of eosin Y binding have been determined employing stopped-flow fluorometry.     

Coupled-Soliton All-Optical Logic Device with Two Parallel Tapered Waveguides

In this article, a new all-optical logic device by using the interaction of spatial solitons has been proposed. The operation of the proposed device is based on the evolution of a nonlinear guided wave propagating along two parallel tapered waveguides with a Kerr-type nonlinear medium between them. The numerical results show that this device could be potentially useful in several all-optical logic functions (AND, OR, and XOR).     

细菌视紫红质膜的光吸收非线性特性研究

对细菌视紫红质（ＢＲ）膜的光学吸收非性进行了研究,分别测量了细菌视紫红质光照前后的光吸收谱,结果显示它的吸收发生了明显的变化。用Ｚ扫描法研究了它的光学非线性,理论计算的结果表明它具有较大的光学非线性系数,且测量它的透过率随光强变化的关系曲线和理论模拟发现它对６３２．８ｎｍ波和匠光具有饱和吸收特性。     

分散橙3掺杂聚合物薄膜的全光极化特性及其驰豫过程研究

利用旋涂法制备了分散橙3(DO3)/PMMA主客体掺杂薄膜,对其吸收谱、厚度和折射率进行了测量,并采用全光极化的方法对薄膜的二阶非线性光学特性进行了研究.实验结果表明,随着厚度的增加其二阶非线性先增强后减弱,d33最大值约为0.827×10~(-2) pm/V.对极化饱和后的驰豫情况进行了分析,发现不同厚度薄膜的驰豫时间不同,这是由于薄膜中偶氮含量和厚度的不同,分子间的相互作用对顺反异构逆过程的快慢有较大的影响.