Study on preparation process and emission performance of AlxGa1-xAs/GaAs photocathodes with distributed Bragg reflector

Cheng Feng; Shuai Cheng; Jian Liu; Yijun Zhang; Yunsheng Qian

doi:10.1117/12.3014282

30 April 2024 Study on preparation process and emission performance of Al_xGa_1-xAs/GaAs photocathodes with distributed Bragg reflector

Cheng Feng, Shuai Cheng, Jian Liu, Yijun Zhang, Yunsheng Qian

Author Affiliations +

Proceedings Volume 13155, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Imaging Systems; 131550A (2024) https://doi.org/10.1117/12.3014282
Event: Sixth Conference on Frontiers in Optical Imaging Technology and Applications (FOI2023), 2023, Nanjing, JS, China

Abstract

In order to study the photoelectric emission performance of distributed Bragg reflector structure on GaAs photocathodes, a reflective GaAs photocathode with a buffer layer of distributed Bragg reflector structure was designed and grown. The samples were subjected to optical property testing, chemical cleaning, high-temperature purification, and Cs/O activation. Finally, the photoelectric emission efficiency of GaAs photocathodes with distributed Bragg reflector structure was measured. By comparing with traditional reflection-mode GaAs photocathodes, it was found that the introduction of DBR structure makes the optical performance and quantum efficiency of GaAs photocathodes completely different from traditional structures. Through the reasonable design of DBR structure, the absorption efficiency of specific wavelength incident light in the photocathode body can be improved. In addition, the preparation process including cleaning and activation was implemented. Combined with improved preparation technology, the emission efficiency of the photocathode can be improved.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Cheng Feng, Shuai Cheng, Jian Liu, Yijun Zhang, and Yunsheng Qian "Study on preparation process and emission performance of Al_xGa_1-xAs/GaAs photocathodes with distributed Bragg reflector", Proc. SPIE 13155, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Imaging Systems, 131550A (30 April 2024); https://doi.org/10.1117/12.3014282

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