公开(公告)号：US12176174B2

公开(公告)日：2024-12-24

申请号：US17619686

申请日：2020-06-19

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Tetsuya Fujita ,  Takahiro Suzuki ,  Yasuhide Miyazaki ,  Naoya Kawai ,  Peter Uhd Jepsen ,  Simon Lehnskov Lange

IPC: H01J31/48 ,  H01J29/86

Abstract: An electron tube includes a housing that is internally held in a vacuum and has a window transmitting an electromagnetic wave, an electron emitting unit that is disposed in the housing and has a meta-surface emitting electrons in response to incidence of the electromagnetic wave, an electron multiplying unit that is disposed in the housing and multiplies the electrons emitted from the electron emitting unit, and an electron collecting unit that is disposed in the housing and collects the electrons multiplied by the electron multiplying unit. The window contains at least one selected from quartz, silicon, germanium, sapphire, zinc selenide, zinc sulfide, magnesium fluoride, lithium fluoride, barium fluoride, calcium fluoride, magnesium oxide, and calcium carbonate.

公开(公告)号：US12261010B2

公开(公告)日：2025-03-25

申请号：US17619711

申请日：2020-06-19

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Peter Uhd Jepsen ,  Simon Lehnskov Lange ,  Motohiro Suyama ,  Masahiko Iguchi

IPC: H01J1/34 ,  H01J31/50 ,  H01J40/06 ,  H01J43/24

Abstract: This invention concerns a 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 comprises a conducting structure having a geometry, the geometry comprising a tip section. The tip section is adapted to provide field enhancement, β, when the conducting structure is illuminated with the electromagnetic radiation, wherein β is greater than about 102. The photo-cathode further comprising a substrate, the substrate being or comprising a dielectric substrate, the substrate supporting the conducting structure.