Intensity Distribution and Phase Vortices of Speckle Fields Generated by Multi-Aperture Random Scattering Screens

The intensity distribution and phase vortices of the speckle fields generated by multi-aperture random scattering screens are simulated, and it is found that the vortices exhibit layer-like structures and the dislocation phenomena occur in the local phase patterns produced by the two-pinhole aperture, whose phase distributions appear as striped structures. For three- or four-pinhole aperture, there are many circular bright spots appearing in the speckle grains, and there is one vortex between the neighboring circular bright spots. The positive and negative phase vortex lattices appear in the phase distributions, and the regions circled by the isothetic phase lines form irregular quadrilaterals or hexagons. Moreover, the relative positions of the vortices or bright spots can be adjusted by changing those of the pinhole apertures.     

弱散射体产生的菲涅耳极深区散斑场相位涡旋演化的实验研究

实验提取了弱散射体产生的菲涅耳极深区的散斑场.发现当散射距离一定时,弱散射体光场的相位分布特征随散射体的粗糙度的变化而变化;对于某一弱散射体,相位分布特征随散射距离的变化而变化;当弱散射体的粗糙度大到一定程度时,才产生相位涡旋现象;散射体表面上存在相位涡旋;弱散射体产生的相位涡旋的密度随散射屏粗糙度的增大而增大,还随散射距离的增大而增大.研究结果对于认识弱散射体的相位及相位涡旋分布特征随粗糙度和散射距离的演化具有重要意义,而且对于认识散斑场随散射距离的演化有一定的帮助.     

金属卟啉-Sn网络可控非共价功能化碳纳米管的制备及蛋白吸附应用

本工作通过简便的一锅溶剂热法, 发展一种卟啉一步金属化且与Sn桥连形成的配合物网络非共价功能化的多壁碳纳米管复合材料(MMPT), 以增强对蛋白质的吸附. 在溶剂热条件下, Sn进入中位-四(4-羧基苯基)卟吩(TCPP)大环使卟啉金属化形成SnTCPP, 同时Sn作为交联剂桥连多壁碳纳米管(MWCNTs)表面的SnTCPP分子, 通过配位自组装形成均匀连续的SnTCPP-Sn网络壳层, 而无需对TCPP和/或MWCNTs进行任何的修饰. 在这种合成策略下, 通过调整MWCNTs/TCPP的比例, 实现了卟啉层厚和位点密度的可控. 并通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)及其能量色散X射线能谱(EDS)、紫外-可见分光光度计(UV-Vis spectrophotometer)、傅里叶变换红外分光光度计(FT-IR spectrophotometer)、zeta电位等对所得MMPT的结构和性能进行了全面的表征. 在最佳的碳纳米管比例和吸附条件下, MMPT对牛血清白蛋白(BSA)表现出较好的吸附性能, 此外, MMPT对其他蛋白质如牛血红蛋白(BHb)和溶菌酶(Lyz)也表现出良好的吸附亲和力, 使得其在蛋白吸附、药物递送、传感等方面具有广泛的应用前景.     

功能化修饰磁性分子印迹纳米平台的构建及其局部去势治疗性能研究

无机纳米复合材料的构建及其在肿瘤治疗/诊断领域的应用是新型纳米诊疗药物的研究热点.前列腺癌去势治疗药物主要是通过抑制全身雄激素的产生或阻滞雄激素与雄激素受体(AR)结合发挥作用,但具有全身性副作用.因此,开发新型去势策略以选择性去除局部组织的睾酮(Testosterone,TSTO),对于增强治疗效果并降低全身副作用具...     

Experimental method for the extraction of intensity profiles by imaging the scattered pattern with a charge-coupled devic

A practicable experimental method for measuring scattering on rough surfaces is reported.The scattered patterns are captured on a screen composed of two pieces of ground glass and then imaged using a chargecoupled device.The scattered intensity profiles are extracted by converting the patterns in real space into the wave vector space.Isotropic and anisotropic samples of the rough backsides of silicon wafer are investigated respectively,and their intensity profiles are measured.The profiles of the anisotropic sample are obtained by reading the pixels on the specific orientation curves.The parameters of the samples are extracted using angle-resolved light-scattering schemes and theories.The results well agree with measurements obtained using an atomic force microscope.     

利用干涉光场的相位涡旋测量拉盖尔-高斯光束的轨道角动量

对拉盖尔-高斯光束经多圆孔衍射屏在远场平面上形成的干涉光场的相位和零值线进行了计算模拟.当入射光束的轨道角动量量子数为零时,实部零值线与虚部零值线在干涉光场中心点不相交,因而在该点上不能形成相位涡旋.当入射光束的轨道角动量量子数为+1和-1时,实部零值线与虚部零值线在干涉光场中心垂直并相交,干涉光场相应位置处的相位涡旋的符号相反.当入射光束的轨道角动量量子数为±2和±3时,有四条零值线相交于干涉光场的中心点上,并且实部零值线和虚部零值线交替分布,该交点处形成的相位涡旋的拓扑荷的值恰好与拉盖尔-高斯光束的轨道角动量量子数相等.这种结果可以用来测量涡旋光束的轨道角动量.