The invention discloses a semiconductor structure, processing light signal, the semiconductor structure comprising: a first type semiconductor layer; a second type semiconductor layer; an active layer located between the first type semiconductor layer and the second type semiconductor layer; a reflector covered surfaces of the first type semiconductor layer and the second type semiconductor layer; a first pad disposed on a top surface of the reflector which is covered the first type semiconductor layer; a second pad disposed on the top surface of the reflector or second type semiconductor layer; an aperture disposed on the top surface of the first type semiconductor layer and passed through the reflector; and a light collection module disposed around the aperture or covered a top surface of the reflector.