Optical antenna

摘要

An optical antenna is formed by a flat board optical guide member which has an incidence surface (15) on a surface in a thickness direction and an emergence surface (12) on the other surface; a light condensing member (13) which is disposed so as to face the emergence surface of the optical guide member (11), a light receiving element which is disposed in a light condensing position in the light condensing member. A slanted surface (17) for reflecting a total incident light on a back surface (16) of the optical guide member is formed so as to direct the reflected incident light toward the emergence surface. By doing this, it is possible to form a light-weight optical antenna for receiving the signal light in which it is possible to align the optical axis with the signal light.