Patent ID: 8427039
Filing Date: 2013-04-23
Classification: B82Y,H01J

Abstract:
1. An optically controlled cold-cathode electron tube, said tube comprising a cold cathode which includes: a conductive substrate; an emitter or a plurality of emitters, formed on said conductive substrate, of nanometer and/or micron size and of elongated shape in a direction perpendicular to said conductive substrate, and a source generating an optical wave for direct optical control of the emitter or the plurality of emitters via an electrical field of said optical wave, wherein each said emitter comprises a first material of the carbon type with substantially sp2 bonding, encapsulating, in direct or indirect contact, a second metallic material, said second metallic material at least located at a top of the emitter, and wherein said second material has a plasma frequency approximately equal to or greater than a frequency of the optical control wave.