Photoelectric conversion device, electromagnetic wave detection device, photoelectric conversion method and electromagnetic wave detection method

A photoelectric conversion method comprising:

• a first electron emission step of using a meta-surface which includes a plurality of patterns including an antenna portion extending in a predetermined direction and at least one bias portion facing the antenna portion and emitting an electron from the antenna portion in response to incidence of an electromagnetic wave to be measured on the meta-surface in a first sate, the first state being a state where an electric potential is applied to the meta-surface in such a manner that a component of an electric field from the bias portion toward the antenna portion in the predetermined direction is positive;
• and
• a second electron emission step of using the meta-surface and emitting an electron from the antenna portion in response to incidence of the electromagnetic wave to be measured on the meta-surface in a second state, the second state being a state where an electric potential is applied to the meta-surface in such a manner that the component of the electric field from the bias portion toward the antenna portion in the predetermined direction is negative, wherein
• the antenna portion includes first and second leading ends disposed at mutually different positions in the predetermined direction,
• the bias portion includes a first bias portion facing the first leading end, and a second bias portion facing the second leading end,
• in the first electron emission step, an electric potential is applied to the meta-surface in such a manner that a component of an electric field from the first leading end toward the first bias portion in the predetermined direction is positive, and that a component of an electric field from the second bias portion toward the second leading end in the predetermined direction is positive, and
• in the second electron emission step, an electric potential is applied to the meta-surface in such a manner that a component of an electric field from the first bias portion toward the first leading end in the predetermined direction is negative, and that a component of an electric field from the second leading end toward the second bias portion in the predetermined direction is negative.