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US 12,400,821 B2Granted
Metasurface element, electron tube, and method for producing electron tube
AssigneeHamamatsu Photonics K.K.
InventorsNaoya Kawai, Hideaki Yoshiara, Yuya Suzuki, Genki Nakagomi
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Abstract
A metasurface element includes a support body and a metasurface formed on a surface of the support body. The metasurface includes a metal pattern that is disposed to emit an electron in response to incidence of an electromagnetic wave, and a metal layer that contains an alkali metal and is formed on the metal pattern. The metal layer extends beyond the metal pattern to reach a region on the surface of the support body, the region being not formed with the metal pattern.
Claims19
A metasurface element comprising:
- a support body;
- and
- a metasurface formed on a surface of the support body,
- wherein the metasurface includes a metal pattern that is disposed to emit an electron, due to field emission, in response to incidence of an electromagnetic wave, and a metal layer that contains an alkali metal and is formed on the metal pattern, and
- the metal layer extends beyond the metal pattern to reach a region on the surface of the support body, the region being not formed with the metal pattern.
2 more elements
A method for producing an electron tube, the method comprising:
- a first step of disposing a metasurface element and an alkali supply source inside a housing, wherein the metasurface element includes a support body and a metasurface that is formed on a surface of the support body and includes a metal pattern disposed to emit an electron, due to field emission, in response to incidence of an electromagnetic wave;
- and
- a second step of causing the alkali supply source to emit a vaporized alkali metal, and heating the housing to disperse the alkali metal inside the housing to form a metal layer on the metal pattern, the metal layer containing the alkali metal.
Dependencies are inferred from the claim text.