本文研究了用电子束蒸镀工艺制备用于光波导器件的 Si O2 膜。采用高温退火处理工艺使 Si O2 膜的光学和物理特性稳定。在蒸镀过程中 ,输入不同压力的 O2 ,可以改变和控制 Si O2 膜的组分 ,达到控制膜折射率的目的。通过逐次蒸镀、退火...本文研究了用电子束蒸镀工艺制备用于光波导器件的 Si O2 膜。采用高温退火处理工艺使 Si O2 膜的光学和物理特性稳定。在蒸镀过程中 ,输入不同压力的 O2 ,可以改变和控制 Si O2 膜的组分 ,达到控制膜折射率的目的。通过逐次蒸镀、退火的工艺 ,实现 1μm以上厚 Si O2 膜的制备。展开更多
Fiber Bragg grating Fabry-Perot (FBG F-P) cavity is used as the sensing model to measure the refractive index of the liquid solution. The cladding of the fiber, which is used as the F-P cavity, is etched by HF solutio...Fiber Bragg grating Fabry-Perot (FBG F-P) cavity is used as the sensing model to measure the refractive index of the liquid solution. The cladding of the fiber, which is used as the F-P cavity, is etched by HF solution to enhance the sensitivity to the external refractive index. The experimental results show that with the concentration change of the external solution, the effective refractive index of etched fiber will change, thus the spectra of FBG F-P cavity will appear a spilt point. The relationship be...展开更多
The refraction and reflection of Gaussian beam on two-dimensional photonic crystal （2DPC） slab are studied by the finite-difference time-domain （FDTD） method. It is shown that 2DPC slab enables negative refraction...The refraction and reflection of Gaussian beam on two-dimensional photonic crystal （2DPC） slab are studied by the finite-difference time-domain （FDTD） method. It is shown that 2DPC slab enables negative refraction, which is demystified by the distribution of Poynting vector directions and values inside the 2DPC. A negative Goos-Haenchen shift is also found in the simulation.展开更多
文摘本文研究了用电子束蒸镀工艺制备用于光波导器件的 Si O2 膜。采用高温退火处理工艺使 Si O2 膜的光学和物理特性稳定。在蒸镀过程中 ,输入不同压力的 O2 ,可以改变和控制 Si O2 膜的组分 ,达到控制膜折射率的目的。通过逐次蒸镀、退火的工艺 ,实现 1μm以上厚 Si O2 膜的制备。
基金supported by the National Nature Scien- ce Foundation of China (Grant No.60672015).
文摘Fiber Bragg grating Fabry-Perot (FBG F-P) cavity is used as the sensing model to measure the refractive index of the liquid solution. The cladding of the fiber, which is used as the F-P cavity, is etched by HF solution to enhance the sensitivity to the external refractive index. The experimental results show that with the concentration change of the external solution, the effective refractive index of etched fiber will change, thus the spectra of FBG F-P cavity will appear a spilt point. The relationship be...
文摘为了实现液力偶合器漩涡流场高精度试验测量,研究粒子图像测速(PIV)流场试验测量环节的主要误差来源,分析示踪粒子选择、图像采集策略和流速提取算法对流场测量精度的影响,提出降减和消除误差的途径与方法.研究结果表明:在容积为2 710 m L的水介质液力偶合器中投入1.0 g等效直径为1.5μm的PSP示踪粒子,图像采集效果好且粒子浓度满足PIV测速要求;将液力偶合器外壁表面设计为大平面采集区域能够有效地避免反光现象,并降低离轴角误差和光路折射误差;采用递归互相关算法,使用自适应查询区域分析方法,通过3次迭代计算,能够更好地提取主流区域上大尺度漩涡流动特征和局部角隅区域上小尺度涡旋结构特征.
基金This work was supported by the Natural Science Foundation of Jiangsu Province of China under Grant No. BK2004059.
文摘The refraction and reflection of Gaussian beam on two-dimensional photonic crystal （2DPC） slab are studied by the finite-difference time-domain （FDTD） method. It is shown that 2DPC slab enables negative refraction, which is demystified by the distribution of Poynting vector directions and values inside the 2DPC. A negative Goos-Haenchen shift is also found in the simulation.
