红外与可见光图像配准算法

提出把二阶互信息与对齐度相结合作为相似度函数,通过Hough变换提取两幅图像中一致性较高的直线,计算它们的对齐度,最后针对不同的图像特点,调整对齐度在新相似度函数中所占比例进行配准.实验结果表明.新算法与其他几种测度函数相比有更高的精确性和鲁棒性.     

Anisotropic Structure and Charge Transport in Highly Strain‐Aligned Regioregular Poly(3‐hexylthiophene)

A novel method of strain‐aligning polymer films is introduced and applied to regioregular poly(3‐hexylthiophene) (P3HT), showing several important features of charge transport. The polymer backbone is shown to align in the direction of applied strain resulting in a large charge‐mobility anisotropy, where the in‐plane mobility increases in the applied strain direction and decreases in the perpendicular direction. In the aligned film, the hole mobility is successfully represented by a two‐dimensional tensor, suggesting that charge transport parallel to the polymer backbone within a P3HT crystal is strongly favored over the other crystallographic directions. Hole mobility parallel to the backbone is shown to be high for a mixture of plane‐on and edge‐on packing configurations, as the strain alignment is found to induce a significant face‐on orientation of the originally highly edge‐on oriented crystalline regions of the film. This alignment approach can achieve an optical dichroic ratio of 4.8 and a charge‐mobility anisotropy of 9, providing a simple and effective method to investigate charge‐transport mechanisms in polymer semiconductors.     

Super‐Fast Switching of Twisted Nematic Liquid Crystals on 2D Single Wall Carbon Nanotube Networks

We have developed a high performance liquid crystal (LC) alignment layer of ultra‐thin single wall carbon nanotubes (SWNTs) and a conjugated block copolymer nanocomposite that is solution‐processible for conventional twisted nematic (TN) LC cells. The alignment layer is based on the non‐destructive solution dispersion of nanotubes with a poly(styrene‐b‐ paraphenylene) (PS‐b‐PPP) copolymer and subsequent spin coating, followed by conventional rubbing without a post‐annealing process. Topographically grooved nanocomposite films with two dimensionally (2D) networked SWNTs embedded in a block copolymer matrix were created using a rubbing process in which bundles of SWNTs on the composite surface were effectively removed. The LCs were well aligned with a stable pre‐tilt angle of approximately 2° on our extremely transparent nanocomposite, which gave rise to superfast switching of the TN LC molecules that was approximately 3.8 ms, or four times faster than that on a commercial polyimide layer. Furthermore, the TN LCD cells containing our SWNT nanocomposite alignment layers exhibited low power operation at an effective switching voltage amplitude of approximately 1.3 V without capacitance hysteresis.     

特种器件厚外延前后图形转移方法研究

提出了一种特种器件厚外延前后图形的转移方法.通过设计一块带外延前图形层的对位标记和投影光刻机识别标记的掩膜版,解决了厚外延之前图形的精确套准和厚外延之后投影光刻的难题,实现了厚外延前后的套刻精度高于0.5 μm.该方法可广泛应用于带埋层的VDMOS、超结VDMOS、高压互补双极器件,以及高压BCD器件的投影光刻.     

晶片映射系统原理及实现算法研究

介绍了晶片映射系统及其原理。该系统修正了机械手采用传统方式自动取片时执行效率低、料片状态无纠错功能的弊端,并详细论述了该系统的实现细节及算法。     

大直径探针台的晶圆自动传输系统

介绍了适应大直径探针台的晶圆自动传输系统及其主要的组成部分——一片盒承载台、关节机械手、预对准装置。应用动力学分析证明R-θ型机械手的直线运动轨迹,阐述了机械式和光学预对准装置的主要原理,说明了晶圆自动传输系统的应用前景。     

柔性结构技术在精密工件台中的应用

通常,在半导体设备刚性结构设计中要求零部件有很高的加工制造精度和装配精度,同时易传递振动、热等,并容易引入附加的力和转矩。为降低质量和成本,并提高工作性能,目前在工件台的设计中广泛采用柔性结构设计技术。列举了常见柔性件结构形式,并分析了不同结构形式柔性件的旋转刚度和精度等特性。同时,根据工件台的实际工作状态和性能需求,...     

保偏光纤器件的对轴角度分析与测量

理论推导了保偏光纤(PMF)对轴角度、起偏器起偏角与相干域检测信号的关系,仿真分析表明,对轴误差越大,引起的偏振耦合越大.根据白光干涉原理,采用Michelson干涉仪光程补偿的方法,实验研究了偏振耦合强度与对轴角度之间的关系,并根据测量的耦合强度数据计算出对轴角度.     

定向刨花板定向角的激光测量

在实验室和生产线上用便携式激光监测系统对定向刨花板(OSB)的刨花定向角进行在线测量,结果表明,激光监测系统能对OSB的刨花定向角的分布情况进行高效、实时、准确的在线测量,为实现OSB生产工艺的及时优化和提高产品的质量提供技术支撑.     

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

The field-free alignment of molecule ClCN is investigated by using a terahertz few-cycle pulse (THz FCP) based on the time-dependent density matrix theory. It is shown that a high degree of molecular alignment can be obtained by changing the matching number of the THz FCPs in the adiabatic regime and the non-adiabatic regime. The matching number can affect both the maximum value of the alignment and the time at which it is achieved. It is also found that a higher degree of alignment can be achieved by using the THz FCP at lower intensity and there exists an optimal threshold of molecular alignment with the increase of the field amplitude. Also found is the frequency sensitive region in which the degree of maximum alignment can be enhanced greatly by modulating the center frequencies of different THz FCPs. The investigation demonstrates that comparing with a THz single-cycle pulse, a better result of the field-free alignment can be created by a THz FCP at a constant rotational temperature of molecule.