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Proceedings Paper

Resolution characteristics of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathodes
Author(s): Wenjuan Deng; Daoli Zhang; Jijun Zou; Xincun Peng; Weilu Wang; Yijun Zhang; Benkang Chang
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Paper Abstract

The resolution model of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathode is solved numerically from the two-dimensional continuity equations. According to the model, the theoretical modulation transfer functions (MTFs) of different structure reflection-mode photocathodes were calculated, and the effects of doping concentration, Al composition, AlGaAs and GaAs layer thickness on the resolution of cathodes were analyzed. The simulation results show that both graded composition and graded doping structures can increase the resolution of photocathode, and the effect of graded composition structure is more pronounced. The resolution improvement is attributed to the built-in electric field induced by a graded composition or doping structure. The simulation results also show that the MTFs of cathodes are affected by the AlGaAs and GaAs layer thickness.

Paper Details

Date Published: 5 November 2015
PDF: 7 pages
Proc. SPIE 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015, 97951X (5 November 2015); doi: 10.1117/12.2216219
Show Author Affiliations
Wenjuan Deng, East China Institute of Technology (China)
Huazhong Univ. of Science and Technology (China)
Daoli Zhang, Huazhong Univ. of Science and Technology (China)
Jijun Zou, East China Institute of Technology (China)
Xincun Peng, East China Institute of Technology (China)
Weilu Wang, East China Institute of Technology (China)
Yijun Zhang, Nanjing Univ. of Science and Technology (China)
Benkang Chang, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 9795:
Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015
Shenggang Liu; Songlin Zhuang; Michael I. Petelin; Libin Xiang, Editor(s)

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