排序方式: 共有54条查询结果,搜索用时 62 毫秒
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The supramolecular assembly of bis[3, 4, 12, 13, 21, 22, 30, 31-octa(dodecylthio)-2, 3-naphthalocyaninato] erbium complex (Er[Nc(SC12H25)8]2) was fabricated at the air/water interface by Langmuir monolayer technique. Surface pressure-area isotherm indicates that stable monolayer is formed. The monolayer morphology on mica was investigated by atomic force microscopy (AFM). Columnar domains of ca. 100 nm ×(20-30) nm appearing in the micrograph have ordered orientation. Polarized UV-vis spectra and small-angle X-ray diffraction pattern show that the macrocycles tilt in the monolayer. The orientation angle of the naphthalocyanine ring with respect to the substrate was found to be ca. 54°. Each monolayer is ca. 3.53 nm thick. The columnar domain comprises 4-6 rows of columnar supramolecular assemblies where the molecules stack face-to-face. 相似文献
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小孔衍射和近场散射数值计算的格林函数方法 总被引:1,自引:1,他引:0
从简谐光波满足的亥姆霍兹方程出发,将由格林定理得到的介质分界面上的积分方程转化为以表面上的光波及其导数为未知量的线性方程组,并对其进行数值求解,实现了光场的数值计算。然后将这一方法应用于亚波长尺度的小孔衍射的光波以及自仿射分形表面产生的随机光场及其在近场区域范围内的传播的计算。在随机表面产生的光场计算中.提出了类比推导夫琅禾费面上散斑场自相关函数的方法产生随机表面,以及计算其导数的傅里叶变换方法。对光场的计算结果表明,在近场范围内,光场随离开表面的距离的增加而迅速变化,其传播特性完全不同于光场在远场范围内的传播特性。 相似文献
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Using the interference of speckle and the spherical reference wave,we extract the real and the imaginary parts of the complex amplitudes of the speckle in large angle scattering.By calculating the spatial correlation functions of intensity,we find that the speckle has a property of regional fractality,i.e.the fractal exponent equals 1 in a small spatial region and it becomes less than 1 in a bigger region.The empirical analytic expression of the intensity correlation function is gained.The probability density distributions of the intensities and the complex amplitudes show that the regional fractal speckle still obeys zero-mean circular complex Gaussian statistics. 相似文献
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Correlation and fractal properties of speckles in the extremely deep Fresnel diffraction region 下载免费PDF全文
Based on the Kirchhoff approximation and the theoretical analysis of the random light fields,the speckle intensity distributions in the extremely deep Fresnel diffraction region are simulated.The fractal property of the speckles as well as the relation between the speckle intensity distribution and the corresponding random surface is investigated.We design a microscope system to detect experimentally the speckles in the extremely deep Fresnel diffraction region,and the experimental results prove the conclusions drawn from our simulations. 相似文献
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旋转孔径白光散斑照相法的研究 总被引:3,自引:1,他引:2
本文报道利用旋转孔径法进行白光散斑照相,研测动态问题.其不仅具有旋转孔径激光散斑照相的优点,而且最突出的优点是能走出实验室,到现场进行动态测量研究. 相似文献
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采用随机表面的高斯相关模型和统计光学原理,推导出弱散射体在4f系统中的像面上光强的表达式.在此基础上提出了均方偏差粗糙度和横向相关长度的标定方法,该方法用理论结果对实验测量的像面散斑平均光强随滤波孔半径的关系曲线进行拟合,同时测量出被测样品表面的两个统计量.实验上制作了高斯相关随机表面样品,对其表面参数进行了测量,与AFM所测结果符合得较好,这表明该方法具有较高的精度.
关键词:
弱散射体
像面散斑
平均光强 相似文献
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利用射频磁控溅射法在有机薄膜衬底和7059玻璃衬底上制备出了具有良好附着性的低电阻率的ZnO:Al透明导电膜,对在低温(25~210℃)下制备薄膜的结构和光电特性进行了比较研究. 铝掺杂的氧化锌薄膜是多晶膜,具有六角纤锌矿结构,最佳取向为(002)方向.薄膜的最低电阻率分别为1.0×10-3和8.4×10-4Ω·cm,在可见光区的平均透过率分别达到了72%和85%. 相似文献