Abstract

At present, most of the existing practical ultraviolet (UV) solar-blind detectors are based on Te–Cs photocathode image intensifiers. However, limited by their photoemission characteristics, it is difficult for the Te–Cs-based photocathodes to achieve both high quantum efficiency in the application band and high cutoff ratio in the non-applied band simultaneously. In this paper, a high-quantum-efficiency UV solar-blind detector based on AlGaN photocathodes with a sharp spectral sensitivity threshold at 300 nm is reported. The proposed AlGaN photocathode has extremely high quantum efficiency (i.e., 20%) in the 210–275 nm band, while the efficiency curve steeply reduces to 2% at 300 nm, showing obviously superior performance than the existing Te–Cs photocathodes.

© 2018 Optical Society of America

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