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

• Basic Optics • Previous Articles     Next Articles

Photoelectron emission characteristics of photocathode by Monte Carlo method

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

  1. 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

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

CLC Number: