新型光电阴极的研究进展*

doi:10.13385/j.cnki.vacuum.2024.05.09

摘要/Abstract

摘要： 为了满足高频率、小型化微波真空电子器件需求,寻找合适的阴极和激光系统,研究了一种新型锑铯光电阴极的制备方法。发射材料的蒸发源采用多孔钨海绵扩散阻挡层代替镍管加热技术,以控制发射材料的蒸发速率。为了增强阴极的吸附能力,提高光的吸收率,通过纳米粒子薄膜和离子轰击技术对阴极基体表面进行了改性处理,研究了改性前后阴极表面结构、成分及其光电发射特性。结果表明：表面改性对阴极的量子效率具有很大的提升作用,分析认为阴极表面积的增大是发射性能提高的主要原因,光吸收率的增大也提高了阴极的量子效率。

关键词: 光电阴极, 激光驱动, 多孔钨, 纳米粒子薄膜, 离子束表面改性, 量子效率

Abstract: To meet the needs of high-frequency, miniaturized vacuum microwave devices, and find suitable cathode materials and laser systems, a strategy to develop new type of Cs3Sb cathode was studied. A tungsten sponge diffusion barrier layer was used as the evaporation source of the emission material, instead of the traditional nickel tube heating method. In order to enhance the adsorption capacity and light absorption rate of the cathode, the surface of the cathode substrate was modified by nanoparticle thin film coating and ion beam surface modification. The photoemission characteristics of the photocathodes before and after surface modification of the photocathode were studied. The results show that the photoemission quantum efficiency increases greatly after modification. It is believed through analysis that the main cause for the increase in quantum efficiency is the enhancement of light absorptivity and the increase in emission surface area.

Key words: photocathode, driven by laser, porous tungsten, nanoparticle film, ion beam surface modification, quantum yield

中图分类号: TN105.1

刘燕文, 尚新文, 陆玉新, 田宏, 赵恒邦. 新型光电阴极的研究进展^*[J]. 真空, 2024, 61(5): 64-73.

LIU Yan-wen, SHANG Xin-wen, LU Yu-xin, TIAN Hong, ZHAO Heng-bang. The Development of a Novel Photocathode[J]. VACUUM, 2024, 61(5): 64-73.

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