Correlation and fractal properties of speckles in the extremely deep Fresnel diffraction region

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.     

旋转孔径白光散斑照相法的研究

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.     

纳米结构的透射特性研究

对两边有对称凹槽结构的纳米狭缝的透射特性进行研究,讨论了凹槽的个数、宽度以及深度对平面电磁波透过率的影响.采用二维时域有限差分法进行数值模拟,给出透过率极大的条件.     

纳米金属缝透射的FDTD边界问题研究

时域有限差分法(FDTD)可准确的模拟电磁波经任意介质的衍射与散射.本文依据时域有限差分法并引入Lorentz色散模型理论推导了适用于实际金属的时域有限差分法的迭代公式,利用积分的Maxwell方程组对实际金属边界上的电磁场进行了平均处理,保证了金属缝边界电磁场的连续性,纳米金属缝透射光强分布的数值计算结果验证了边界处理的正确性.