Patent ID: 7339970

Claim:
A surface light emitting element, comprising: a light emitting element part, formed above a semiconductor substrate and emitting light perpendicularly to the semiconductor substrate; a light detecting part, formed above the light emitting element part; and a first electrode and a second electrode, which drive the light detecting part, the light detecting part, including: a second contact layer, including: a second light passage part; and a second electrode coupling part, extending from the second light passage part, only the second electrode coupling part of the second contact layer ohmic-contacts with the second electrode, the second electrode coupling part extending from the second light passage part in a third direction, the second electrode coupling part and the second light passage part extending in a fourth direction, the third direction being opposite to the first direction, the fourth direction being parallel to a second direction, the second electrode coupling part having a length Y′ in the fourth direction, the second light passage part having a length X′ in the fourth direction, the length Y′ being shorter than the length X′; a light absorption layer, formed above the second contact layer; and a first contact layer, formed above the light absorption layer, the first contact layer, including: a first light passage part; and a first electrode coupling part, extending from the first light passage part, the first electrode being formed above the first electrode coupling part of the first contact layer, the first electrode coupling part extending from the first light passage part in a first direction, the first electrode coupling part and the first light passage part extending in the second direction, the first direction and the second direction being perpendicular, the first electrode coupling part having a length Y in the second direction, the first light passage part having a length X in the second direction, the length Y being shorter than the length X.