Phase modulating device and intelligent reflecting surface

A phase modulating device comprising:

• a first electrode;
• a second electrode;
• and
• a liquid crystal layer including a plurality of liquid crystal molecules and arranged between the first electrode and the second electrode,
• wherein the first electrode includes a plurality of first striated portions extending in a first direction parallel to the in-plane direction of the first electrode and arranged in a second direction perpendicular to the first direction, and a first slit portion arranged between each of the plurality of first striated portions,
• wherein a height of the liquid crystal layer from the first electrode toward the second electrode is 30 μm or more and 50 μm or less,
• in a planar view of a first plane including the first electrode, the liquid crystal layer and the second electrode, the first plane intersecting with an in-plane direction of the first electrode, and at least two liquid crystal molecules arranged adjacent to each other in a direction parallel to the in-plane direction of the first electrode and oriented differently from each other are included,
• the second electrode includes a plurality of second striated portions extending in the first direction and arranged to the second direction, and a second slit portion arranged between each of the plurality of second striated portions, and
• in a planar view in a direction from the first electrode to the second electrode, the plurality of first striated portions overlaps only a part of the plurality of second striated portions in the second direction.