US 12,261,010 B2
Photo-cathode for a vacuum system
Peter Uhd Jepsen, Copenhagen (DK); Simon Lehnskov Lange, Copenhagen (DK); Motohiro Suyama, Hamamatsu (JP); and Masahiko Iguchi, Hamamatsu (JP)
Assigned to HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
Appl. No. 17/619,711
Filed by HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
PCT Filed Jun. 19, 2020, PCT No. PCT/JP2020/024161
§ 371(c)(1), (2) Date Dec. 16, 2021,
PCT Pub. No. WO2020/262239, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19182534 (EP), filed on Jun. 26, 2019.
Prior Publication US 2022/0310349 A1, Sep. 29, 2022
Int. Cl. H01J 1/34 (2006.01); H01J 31/50 (2006.01); H01J 40/06 (2006.01); H01J 43/24 (2006.01)
CPC H01J 1/34 (2013.01) [H01J 31/507 (2013.01); H01J 40/06 (2013.01); H01J 43/246 (2013.01); H01J 2201/3425 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Photo-cathode for a vacuum system, wherein the photo-cathode is configured for receiving electromagnetic radiation having an incoming wavelength and for emitting electrons in response thereto, the photo-cathode comprising:
a conducting structure having a geometry, the geometry comprising a tip section, wherein the tip section is adapted to provide a field enhancement factor,β, greater than about 102, and
a substrate, the substrate being or comprising a dielectric substrate, the substrate supporting the conducting structure,
wherein the conducting structure has two dipoles separated by a gap.