ELECTRON TUBE, IMAGING DEVICE AND ELECTROMAGNETIC WAVE DETECTION DEVICE

In an electron tube 1, the meta-surface S emits an electron in response to an incidence of the electromagnetic wave. The first and second electrodes 81, 82 are spaced away from each other, and apply potentials different from each other to the meta-surface S. A holder 30 is disposed in the housing 10 and holds the electron emitter 20. A first conductive line 83 of the meta-surface S is electrically connected to the first electrode 81. A second conductive line 84 of the meta-surface S is spaced away from the first conductive line 83, and is electrically connected to the second electrode 82. The first conductive line 83 extends from the first electrode 81 to the second conductive line 84. The second conductive line 84 extends from the second electrode 82 to the first conductive line 83.