Unit of optical modulator, optical modulator including the same, and method of fabricating the optical modulator

A method of fabricating an optical modulator, the method comprising:

• sequentially stacking a first contact layer, a lower reflection layer, an active layer, an upper reflection layer, and a second contact layer on an upper surface of a substrate;
• etching the second contact layer, the upper reflection layer, the active layer, and the lower reflection layer until a surface of the first contact layer is exposed;
• and
• forming a first electrode on the first contact layer, and forming a second electrode on the second contact layer.

An optical modulator unit comprising:

• a substrate;
• a first contact layer disposed on an upper surface of the substrate, wherein the first contact layer transmits infrared rays;
• a lower reflection layer disposed on the first contact layer;
• an active layer disposed on the lower reflection layer, wherein the active layer comprises a multiple quantum well;
• and
• an upper reflection layer disposed on the active layer;
• wherein a penetration hole is formed through the substrate such that a lower surface of the first contact layer is exposed through the penetration hole.