Element, and terahertz camera system using element

An element comprising an antenna array in which a plurality of antennas is disposed, each of the antennas including

• a first conductor layer,
• a semiconductor layer that is electrically connected to the first conductor layer and that generates or detects a terahertz wave,
• a second conductor layer that is electrically connected to the semiconductor layer and that is opposite to the first conductor layer via the semiconductor layer, and
• a dielectric layer located between the first conductor layer and the second conductor layer, wherein
• the antenna array includes a first antenna, a second antenna, a third antenna, a fourth antenna, and a fifth antenna,
• the second antenna, the first antenna, and the third antenna are arranged in this order in a first direction,
• the fourth antenna, the first antenna, and the fifth antenna are arranged in this order in a second direction that intersects with the first direction,
• the second conductor layer of the second antenna is connected to the second conductor layer of the first antenna via a first coupling line extending in the first direction,
• the second conductor layer of the first antenna is connected to the second conductor layer of the third antenna via a second coupling line extending in the first direction,
• the second conductor layer of the fourth antenna is connected to the second conductor layer of the first antenna via a third coupling line extending in the second direction, and
• the second conductor layer of the first antenna is connected to the second conductor layer of the fifth antenna via a fourth coupling line extending in the second direction.