光电阴极光电子发射特性的蒙特卡罗方法研究

J4 ›› 2018, Vol. 35 ›› Issue (5): 539-543.

光电阴极光电子发射特性的蒙特卡罗方法研究

顾礼1，2，3，李翔1，4，周军兰1，杨勤劳1*，郭宝平1

1深圳大学光电工程学院，光电子器件与系统教育部/广东省重点实验室，广东深圳518060； 2深圳大学信息工程学院，广东深圳518060； 3深圳大学光电中心，广东深圳518060； 4深圳大学高等研究院，广东深圳518060

收稿日期:2017-07-12 修回日期:2017-08-16 出版日期:2018-09-28 发布日期:2018-09-29
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金,11705119), National Key Foundation for Exploring Scientific Instrument of China(国家重大科学仪器设备开发专项,2014YQ230659)，Natural Science Foundation of Guangdong Province (广东省自然科学基金,2017A030310142)，Shenzhen Science and Technology Project (深圳市科技计划项目，JCYJ20170302152748002

Photoelectron emission characteristics of photocathode by Monte Carlo method

GU Li1，2，3, LI Xiang1，4, ZHOU Junlan1, YANG Qinlao1*, GUO Baoping1

1 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; 2 College of Information Engineering, Shenzhen University, Shenzhen 518060, China; 3 Photonics Research Centre, Shenzhen University, Shenzhen 518060, China; 4 Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China

Received:2017-07-12 Revised:2017-08-16 Published:2018-09-28 Online:2018-09-29

摘要/Abstract

摘要：

光电阴极发射光电子的时间特性影响条纹相机和电子衍射系统等时间分析仪器的时间分辨率。使用蒙特卡罗方法研究了光电子的能量、角度分布模型的随机抽样方法，对能量的余弦、Maxwell分布给出了快速的乘抽样方法。计算了光电子的余弦、Maxwell、Beta、Rayleigh、Henke分布等7种能量模型的时间弥散值。验证了时间弥散计算公式的弥散系数为2.643 kg1/2•A-1•s-1，其与加速电场场强的指数关系为-0.996。该方法和结果有助于研究飞秒光电子传播动力学，设计飞秒条纹相机、飞秒电子衍射仪。

关键词: 光电子学；时间弥散；能量分布；角度分布；蒙特卡罗方法；条纹相机

Abstract:

Temporal characteristics of photoelectrons emitted by photoelectric cathodes affect the temporal resolution of time analysis instruments such as streak cameras and electron diffraction systems. Energy, angle distribution model and stochastic sampling method of photoelectrons are investigated by Monte Carlo method. The fast multiplicative sampling method is given for the cosine and Maxwell distribution of energy. Time dispersion values of seven energy models of photoelectron, such as cosine, Maxwell, Beta, Rayleigh and Henke distribution, are calculated. The dispersion coefficient of time dispersion formula is verified to be 2.643 kg1/2•A-1•s-1, and the exponential relationship with the accelerated electric field strength is -0.996. The method and results are useful for investigating the dynamics of femtosecond photoelectron propagation, design of femtosecond streak cameras, femtosecond electron diffractometer.

Key words: optoelectronics; time dispersion; energy distribution; angular distribution; Monte Carlo method; streak camera

中图分类号:

O436 TN143

顾礼李翔周军兰杨勤劳郭宝平. 光电阴极光电子发射特性的蒙特卡罗方法研究[J]. J4, 2018, 35(5): 539-543.

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