[9p-N403-1~16] 7.2 Applications and technologies of electron beams

4:45 PM - 5:00 PM JST(7:45 AM - 8:00 AM UTC)

[9p-N403-13] Development of Photocathodes Utilizing Metal Metasurfaces

〇Keiki Fukumoto¹, Elizaveta Pyatenko¹, Tsuyoshi Toyosawa², Atsushi Kubo² (1.KEK, 2.Univ. Tsukuba)

Keywords:

photocathode,surface plasmon,metallic metastructure

We found that metallic metastructures are a good photocathode. Metallic metastructures resonate with the periodic electric field of near-infrared light, exciting surface plasmons, which are collective oscillations of free electrons. Surface plasmons generate a localized surface electric field, which efficiently induces photoelectric effect. Furthermore, the metal metastructure features a narrow energy width of approximately 40 meV, making it an electron beam source suitable for focusing.