Photoelectron multiplying and collecting tube and imaging device using same

An electron tube comprising:

• a housing internally held in a vacuum and including a window configured to transmit an electromagnetic wave;
• an electron emitting unit disposed in the housing and including a meta-surface configured to emit an electron in response to incidence of the electromagnetic wave;
• an electron multiplying unit disposed in the housing and configured to multiply the electron emitted from the electron emitting unit;
• and
• an electron collecting unit disposed in the housing and configured to collect electrons multiplied by the electron multiplying unit, wherein
• the meta-surface includes a metal layer forming a plurality of antennas,
• the plurality of antennas has a size depending on the wavelength of the electromagnetic wave, and
• the window includes 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.