基于化学知识与教学能力考试的化学教师教育课程改革探讨

介绍了《化学学科知识与教学能力（初级中学）考试大纲》和《化学学科知识与教学能力（高级中学）考试大纲》的结构与价值取向,从理念、内容、评价等角度分析了考试改革对化学教师教育课程的影响,探讨了化学教师教育课程改革的原则,并从培养目标审核、能力目标分解等方面提出了改革建议。     

Modal analysis of the Oth order nulled phase masks

A simple modal analysis （MA） method to explain the diffraction process of 0th order nulled phase mask is presented. In MA, multiple reflections of the grating modes at grating interfaces are considered by introducing equivalent Fresnel coefficients. Analytical expressions of the diffraction efficiencies and modal guidelines for the 0th order hulled phase grating design are also presented. The phase mask structure, which comprises a high-index contrast HfO2 grating and a fused-silica substrate, is optimized using rigorous coupled-wave analysis around the 800-nm wavelength, after which the modal guideline for cancellation of the 0th order in a phase mask is verified. The proposed MA method illustrates the inherent physical mechanism of multiple reflections of the grating modes in the diffraction process, which can help to analyze and design both low-contrast and high-contrast gratings.     

Resonant characteristics of microcantilever by using self-mixing interferometer based on phase reconstruction method

<正>The self-mixing interferometer is used to investigate the characteristics of resonant frequency of the microresonator, which is excited by a sinusoidally driven loud-speaker.The detected self-mixing signal is processed by the phase reconstruction method.The 1st-order resonant frequency of the microresonator is measured to be 4.437 kHz with full-width at half-maximum(FWHM) of 0.13 kHz.The measurement results are verified by the sinusoidal phase modulating(SPM) interferometer.     

深紫外双层金属光栅偏振器的设计与分析

193 nm波长浸没式步进扫描投影光刻机是实现45 nm及以下技术节点集成电路制造的核心装备.增大数值孔径是提高光刻分辨率的有效途径,而大数值孔径曝光系统的偏振性能严重影响光刻成像质量.光刻机曝光系统偏振参数的高精度检测是对其进行有效调控的前提.基于光栅的偏振检测技术能实现浸没式光刻机偏振检测装置的小型化,满足其快速、高精度在线检测的需求,该技术中的关键部件是结构紧凑且偏振性能良好的光栅.本文基于反常偏振效应和双层金属光栅对TE偏振光的透射增强原理,采用严格耦合波理论和有限时域差分方法,设计了一种双层金属光栅偏振器.计算了该偏振器的初始结构参数,并通过数值仿真得到了其偏振性能关于各光栅参数的变化关系.仿真结果表明,中间层高度是影响TE偏振光透射增强的主要因素;垂直入射时TE偏振光的透过率可达到56.8%,消光比高达65.6 dB.与现有同波段金属光栅偏振器相比,所设计的光栅偏振器在保证高透过率的同时,消光比提升了四个数量级.     

Modal analysis of the 0th order nulled phase masks

A simple modal analysis (MA) method to explain the diffraction process of 0th order nulled phase mask is presented. In MA, multiple reflections of the grating modes at grating interfaces are considered by introducing equivalent Fresnel coefficients. Analytical expressions of the diffraction efficiencies and modal guidelines for the 0th order nulled phase grating design are also presented. The phase mask structure, which comprises a high-index contrast HfO 2 grating and a fused-silica substrate, is optimized using rigorous coupled-wave analysis around the 800-nm wavelength, after which the modal guideline for cancellation of the 0th order in a phase mask is verified. The proposed MA method illustrates the inherent physical mechanism of multiple reflections of the grating modes in the diffraction process, which can help to analyze and design both low-contrast and high-contrast gratings.     

高中化学教师资格考试大纲中动词的统计与分析

采用指向性、主题性、转换性原则，对教师资格考试的《化学学科知识与教学能力（高级中学）考试大纲》的动词进行统计。结果显示使用动词41个，词频96次。按照行为动词、心理动词、状态动词、能愿动词对动词进行了分类统计。结果显示心理动词比例过高，行为动词比例偏低，状态动词、能愿动词在考试内容模块与要求部分的数量和频次偏低。