Abstract

The resolution model of a graded doping and graded composition transmission-mode AlGaAs/GaAs photocathode is solved numerically from the two-dimensional continuity equations. According to the model, we calculate the theoretical modulation transfer function (MTF) of different graded doping and graded composition structures. The simulation results show that both graded composition and graded doping structures can increase the resolution of the photocathode. The exponentially doping and linear composition photocathode has the maximum resolution among the possible graded doping and graded composition photocathodes. The resolution improvement is attributed to the built-in electric field induced by a graded composition or graded doping structure. The simulation results also show that the MTFs of AlGaAs/GaAs cathodes increase as the AlGaAs layer thickness decreases, or the incident light wavelength increases.

© 2015 Optical Society of America

Effects of graded band-gap structures on spectral response of AlGaAs/GaAs photocathodes

Jijun Zou, Yijun Zhang, Wenjuan Deng, Xincun Peng, Shaotao Jiang, and Benkang Chang
Appl. Opt. 54(28) 8521-8525 (2015)

Resolution properties of transmission-mode exponential-doping Ga_0.37Al_0.63As photocathodes

Honggang Wang, Xiaoqian Fu, Xuehong Ji, Yujie Du, Jian Liu, Yunsheng Qian, and Benkang Chang
Appl. Opt. 53(27) 6230-6236 (2014)

Photoemission from advanced heterostructured Al_xGa_1-xAs/GaAs photocathodes under multilevel built-in electric field

Cheng Feng, Yijun Zhang, Yunsheng Qian, Benkang Chang, Feng Shi, Gangcheng Jiao, and Jijun Zou
Opt. Express 23(15) 19478-19488 (2015)

Resolution characteristics for reflection-mode exponential-doping GaN photocathode

Honggang Wang, Yunsheng Qian, Yujie Du, Yuan Xu, Liubing Lu, and Benkang Chang
Appl. Opt. 53(3) 335-340 (2014)

Effect of graded bandgap structure on photoelectric performance of transmission-mode Al_xGa_1-xAs/GaAs photocathode modules

Cheng Feng, Yijun Zhang, Jian Liu, Yunsheng Qian, Xinxin Liu, Feng Shi, and Hongchang Cheng
Appl. Opt. 56(32) 9044-9049 (2017)